Aluminum Alloys, Processing and Characterization: Poster Session
Sponsored by: TMS Light Metals Division, TMS: Aluminum Committee
Program Organizers: Dmitry Eskin, Brunel University
Monday 5:30 PM
February 24, 2020
Room: Sails Pavilion
Location: San Diego Convention Ctr
F-5: Aluminum Nanocomposites Made via In-situ Metal-based Pyrolysis: Processing and Microstructure: Aaron Gladstein1; Alan Taub1; 1University of Michigan
Metal matrix nanocomposites (MMNCs) are studied as a means to reduce overall product weight in automotive and aerospace industries while improving mechanical properties such as tensile strength and wear resistance for both ambient and elevated temperatures as compared with monolithic alloys. In-situ methods for producing MMNCs offer enhanced matrix-particle bonding, particle size distribution, and reduction in contamination and potentially cost and complexity as compared with ex-situ processes and are thus preferred for future MMNC production. This research focuses on the processing parameters and microstructural evolution for aluminum nanocomposites made via metal-based pyrolysis (MBP). The MBP process occurs by pyrolyzing an organic precursor polymer within a melt, whereby the metal acts as a pseudo-inert environment. As the polymer breaks down the elements within its chain are used to create ceramic nanoparticles, thus forming an MMNC. The effect of varying precursor composition on nanoparticle formation will be presented.
Cancelled
F-6: Analysis of Microhardness of Al-Si Alloys Directionally Solidified: Roberto Rozicki1; Alicia Ares2; 1Programa de Materiales y Fisicoquímica (ProMyF). Facultad de Ciencias Exactas, Químicas y Naturales (FCEQyN). Universidad Nacional de Misiones (UNaM); 2Universidad Nacional De Misiones
Aluminum alloys with silicon as the main alloying element consist of a class of alloys that provides the most significant part of all castings in the factories. The macrostructure of metallic piece is very important for the quality of casting and the formation of different structural zones. The prediction of the columnar-to-equiaxed transition (CET) structure is of great interest for the evaluation and design of the mechanical properties of solidified products. It is recognized that small dendritic microstructures in foundries, produce superior mechanical properties, particularly when tensile strength and ductility are considered.In the present work the variation of the microhardness along specimens of aluminum-silicon alloys, in vertical directional solidification, was studied, and specimens of different Al-Si alloys concentration (Al-5wt%Si and Al-10wt%Si) were compared using the statistical analysis. It was obtained that the microhardness depends on the microstructure and increases as the silicon content in the alloy increases.
Cancelled
F-7: Corrosion Inhibition Effect of Aloe Saponaria Gel on the Corrosion Resistance of Aluminum: Malena Friedrich1; Mariana Schreiner1; Alicia Ares2; Claudia Méndez2; 1Programa de Materiales y Fisicoquímica (ProMyF). Facultad de Ciencias Exactas, Químicas y Naturales (FCEQyN). Universidad Nacional de Misiones (UNaM); 2IMAM (CONICET-UNaM)
The most effective and efficient corrosion inhibitors are organic compounds that have pi bonds, heteroatoms (P, S, N and O), and inorganic compounds, such as chromates, dichromates, nitrites and so on. However, the use of these compounds has been questioned lately, due to the negative effects they cause in the environment, hence the growing interest in seeking to replace them. The inhibiting effect of Aloe Saponaria gel on the corrosion process of aluminum in an acid medium of 0.5 M HCl was analyzed. Measurements of polarization potentiodynamic, Electrochemical Impedance Spectroscopy and weight loss, in acid medium in absence and presence of the inhibitor, at different concentrations (10%, 20%, 30% v/v), at the following temperatures: 293 K, 308 K, 315 K and 323 K. The results obtained in the different concentrations show an increase in the efficiency of the inhibitor effect at 293 K.
F-8: Development of Two Cavities' Large Wheel Forming Process Using Semi-solid Forging Technology: Min Seok Moon1; Myeong Han Yoo1; Kee Won Kim2; Jong Dae Yoon2; Joon Hyuk Song1; Sang Youp Oh1; 1Korea Institute of Carbon Convergence Technology; 2RheoForge Co., Ltd.
In recent years, the problem of the light weight of heavy trucks and trailers is becoming earnest due to severe fuel costs due to high oil prices and environmental problems caused by exhaust gas. In the case of Korea, for the external competitiveness of heavy trucks, weight reduction of parts for heavy trucks, which have not attracted much attention compared to the passenger car parts market, is emerging as the biggest challenge in the industry. In the general forging technology, liquid phase reaction high forging technology, which has superior formability than solid phase forging, was studied as necessary technology.This semi-solid forging process requires that the uniformity pouring and forming process as a liquid aluminum alloy is feeding into a mold cavity composed of two cavities with uniformly feeding and pressing the mold to each hold cavity. It supplies the product is increasing, and the fabrication is cost down.
Cancelled
F-9: Effect of Nano α-Al(Fe,Mn)Si Particles on the Microstructure and Mechanical Properties of Extruded Al-Si-Mg-based Alloy with ZnO Addition: Sangjun Lee1; Donghyun Bae1; 1Yonsei University
The 6xxx series of Al-Si-Mg aluminum alloys are most typically manufactured extruded alloys, because of their medium strength and good extrudability. In this study, we modified intermetallic particles in Al-Si-Mg-based alloys by adding ZnO nano-powder. The effect of ZnO addition in one of Al-Si-Mg alloys was studied by observing the microstructure in each process state. α-Al(Fe,Mn)Si particle is one of the most typical phases in Al-Si-Mg alloys. With ZnO addition, the α-Al(Fe,Mn)Si particle was combined with several transition metals and modified to fine (~15 nm) and sphere-like particles. This leads to more even and finer grain structure of as-cast state, more active recrystallization and grain growth inhibition after hot extrusion. Furthermore, the particle had a more coherent interface with the Al matrix. It caused coherent hardening and finally-achieved alloy showed high yield strength of 362 MPa, ultimate tensile strength of 393 MPa, and elongation at break of 12.2%.
Cancelled
F-10: Effect of Si Modification on the Mechanical and Tribological Properties of an Al-Si Hyper-eutectic Alloy: Jeheon Jeon1; Donghyun Bae1; 1Yonsei University
Modification of primary Si phase is typically carried out to enhance the mechanical properties. Especially, tribological properties become more important when a large amount of frictional force is required in a part where weight reduction such as automobile parts is required. Here, ZnO nanoparticles were added to an Al-Si hyper-eutectic alloy to control primary SI and eutectic Si simultaneously. Change in microstructures was quantified by optical microscope and scanning electron microscope. Also, Si phases refining mechanism was analyzed by transmission electron microscope. Si modified Al-Si hyper-eutectic alloys improves the mechanical properties as well as tribological properties.
F-11: Effect of Transition Metals Micro-additions on Microstructure and Mechanical Properties Al-Si-Mg Alloy: Lukasz Rogal1; Wojciech Maziarz1; Karol Janus1; Aneta Wilczek2; Alicja Kalinowska1; Piotr Bobrowski1; 1Institute of Metallurgy and Materials Science; 2Limatherm S.A.
The effect of transition metals, e.g. Ti, Zr, V, Nb, Cr, Ag, Mo, Hf, Sc, Ge, In, Ga Ti, Zr, V and Nb, on the microstructure and mechanical properties of Al-Si-Mg alloy has been studied. The application of a single micro-addition (up to 0.25%wt.) does not have a noticeable effect on the alloy microstructure, while a simultaneous combination of 4 micro-elements in the volume of up to 0.8%wt. leads to significant refining of grains and a modification of the eutectic. To improve mechanical properties, the T6 heat treatment has been developed. It consisted of solutioning at 520˚C for 4h and next ageing at 160˚C, 180˚C i 200˚C for 0.15 - 550h. The dependence hardness as a function of the aging time shows that the presence of transition elements in an Al-Si-Mg system leads to prolonged hardness while keeping the alloys at 180˚C. The tensile strength of the alloys containing Ti, Zr, Nb, V micro-additions after the optimal T6 (520˚C/4h and 180˚C/17.5h) has the following properties: R0.2 ≈ 240 MPa and Rm ≈ 380 MPa, at plasticity of 4.5 %. The TEM studies allow to identify the nano-precipitations responsible for the strengthening of alloys. AcknowledgementsThe research was supported by Polish science financial resources The National Centre for Research and Development, in frame of “Szybka Sciezka” program, project No POIR.01.01.01-00-0890/17.
Cancelled
F-12: Effects of Cu Contents on Electric and Mechanical Properties of Al-Zn-Mg based Alloys: Yong-Ho Kim1; Sang-Su Na1; Hyeon-Taek Son1; 1Korea Institute of Industrial Technology
Aluminum alloys have attracted significant interest due to their high potentially lightweight materials for corrosion resistance, specific strength and recycling efficiency. Also, the strength and corrosion resistance of aluminum alloys can be improved by alloying element addition and thermo-mechanical treatment process, which allow aluminum alloys to have optimum grain structure suitable for various applications. In the present work, the effect of Cu addition on the microstructure and tensile properties of aluminum alloys. The aluminum alloy melt was held at 800℃ and then poured into a mould at 200℃. Aluminum alloys were hot-extruded into a rod that was 12 mm in thickness with a reduction ratio of 40:1. The microstructure of specimens was examined by field emission scanning electron microscopy, electron backscatter diffraction. Mechanical properties of the specimens were evaluated by tensile test at room temperature and the results were correlated with development of the microstructure.
F-13: Effects of Filtration Paper and Bleaching Earth on Rolling Mill Oil Performance: Ali Ulus1; Serpil Fidan1; Çisem Doğan1; Eda Özkaya1; Canan İnel1; 1Asaş Aluminium
Rolling mill oils have an extremely important role in the production of aluminum flat products. Rolling mill oil are mainly used to reduce friction between the rolls, remove the extra heat evolved during the process and protect the work rolls from any damage. In this context, the cleanliness of the rolling mill oil positively affects both the rolling process performance and surface quality of the flat-rolled product. In this study, the effects of bleaching earth and filtration papers on the rolling oil performance was investigated. In order to evaluate the filtration performance of the rolling oil under different circumstances, a filtration test device was utilized under vacuum. Bleaching earth with different content and filtration paper with different pore sizes and mechanical properties were used to filtrate two different types of rolling mill oils. Optimum filtration paper and bleaching earth were determined by distillation, flash, viscosity, gum tests and additive analysis.
Cancelled
F-15: Effects of Trace Elements on Thermal Conductivity and Formability of the Extruded Al-RE Alloy Systems: Hyeon-Taek Son1; Yong-Ho Kim1; Sang-Soo Na1; 1Korea Institute of Industrial Technology
Aluminum alloys are widely used in automobiles, aircraft, and electronic components due to high corrosion resistance, low density and high strength. Pure aluminum alloys have excellent electrical and thermal conductivity, but their use is limited by their low strength and formability. Many researchers are studying the development of alloying elements to improve strength and formability, while minimizing the thermal conductivity. Pure aluminum alloys have excellent electrical conductivity and thermal conductivity, but they are limited in their use because of their low strength and formability. Al-RE alloy systems are potential candidates for the fabrication of high-temperature conductors and heat sinks. RE elements with a very low solubility in the Al matrix do not degrade the electrical and thermal conductivity of Al alloys significantly. In this research, effects of trace elements on thermal conductivity and formability of the extruded Al-RE alloy systems were investigated.
F-16: Experimental Investigation of MgAl2O4 Spinel Formation in Oxidation of Al-Mg Alloys: Young-Ok Yoon1; Seong-Ho Ha1; Bong-Hwan Kim1; Hyun-Kyu Lim1; Shae K. Kim1; 1Korea Institute of Industrial Technology
Al-Mg alloys are active when they are exposed to oxygen at elevated temperature. Al alloys in the range from 1 to 4mass%Mg are widely used in industry. Oxide layer of Al-Mg alloys is characterized by MgO and MgAl2O4 spinel. At elevated temperatures, the alloys containing low Mg content form mainly MgAl2O4 spinel on the surface. Further increase of Mg content leads to MgO formation followed by MgAl2O4 spinel. The formation of the MgO outmost layer takes place by the surface segregation of Mg in the initial oxidation. After that, the oxidation is proceeded with MgAl2O4 spinel beneath the MgO. Growth of the oxide layer is promoted by constant formation of MgAl2O4 spinel. The aim of this study is to experimentally investigate the formation of MgAl2O4 spinel in oxidation of Al-Mg alloys containing a wide range of Mg content based on phase diagrams with oxygen partial pressure.
Cancelled
F-17: Heat Treatment Effect and Mechanical Properties of Modified A7075 Alloy for Improved Extrudability: Jaehyuck Shin1; Sehoon Kim1; Jinpyeong Kim1; Siyoung Sung1; Beomsuck Han1; 1Korea Automotive Technology Institute
Due to global regulations on fuel consumption and emissions, automakers and related industries are increasingly interested in the application of lightweight materials to increase the efficiency and to reduce weight of automobiles. In particular, in the case of an aluminum alloy, which is a representative material of lightweight metals, many researches are being actively carried out to overcome the limit of lightweighting by applying the high strength alloys. However, due to the low extrudability of high strength aluminum alloy, it is difficult to apply to automobile parts. In this study, we investigated the heat treatment effect and mechanical properties, such as iso-yield/tensile stress curves, stress corrosion cracking resistance, fracture toughness, etc., of modified 7075 aluminum alloy. As a result, we have successfully developed a high extrudable A7075 alloy having with average yield strength of over 550 MPa, tensile strength of over 600 MPa, and elongation of ~14%.
F-18: Hybrid Aluminum Sheets with Improved Mechanical Properties by Repeated Roll-bonding Process: Cha-Yong Lim1; Seunghee Lee2; 1Korea Institute of Materials Science; 2Mokpo National University
Three kinds of aluminum alloys (AA1050, AA5052, AA6061) were roll-bonded to make hybrid Al sheets with improved mechanical properties. Al sheets with 1 mm thickness, 30 mm width and 300 mm length, were first degreased and wire-brushed for sound roll bonding. The different sheets were then stacked on top of each other and rolled by 50% reduction rate without lubrication at room temperature. The rolled sheet was cut into two pieces of the same dimensions and the same procedure was repeated up to 6 cycles. Microstructural evolution of bonded sheets with the number of the repeated roll-bonding cycles was investigated by OM, TEM, and EBSD. The grain size decreased gradually with the number of repeated roll bonding cycles. The strength of the bonded sheets increased with the number of repeated roll-bonding cycles. Various combinations of strength and elongation were obtained by controlling the repeating cycle and subsequent heat treatment.
F-19: Impact of Dispersion Hardening by Alumina Nano Particles on Mechanical Properties of Al 1100: Ilya Zhukov1; Alexander Kozuluin1; Anton Khrustalev1; Evgeny Moskvichev2; Alexander Vorozhtsov1; Dmitry Lychagin1; 1Tomsk State University; 2Institute of Strength Physics and Materials Science of the Siberian Branch of the Russian Academy of Sciences
The paper presents a study on the effect of adding a small amount of particles to a technically pure aluminum alloy on its structure and mechanical properties. For this purpose laboratory castings of Al 1100 alloy with the addition of 0.5 and 1.0 wt. % Al2O3 were produced. The introduction of master alloys containing particles into the melt was accompanied by ultrasonic treatment. Images of the structure of the alloys obtained showed that ultrasonic treatment contributes to producing a material with zero porosity; this fact is also confirmed by the measurement of density which values are close to the theoretical ones. Analysis of mechanical properties revealed that the conditional yield strength, tensile strength and hardness of the nanocomposite with a metal matrix Al 1100 / wt. nano Al2O3 were prone to increase with increasing the percentage of aluminum oxide in the matrix alloy while reducing the plasticity. This behavior of dispersion hardened alloys is a consequence of refining the grain structure of the material during crystallization due to the presence of particles acting as inoculants.
F-21: Laser Joining of Aluminium and Steel Thin Sheets: Besabakhe Skhosane1; Sisa Pityana1; Monnamme Tlotleng1; 1Council for Scientific and Industrial Research
Automotive heavy body parts used in vehicles lead to high fuel consumption. Ozaki and Kutsuna, [1], resolved the issue of weight by replacing some steel component by aluminium which is lighter. Joining steel to aluminium, which have vast thermal mismatch, is met with difficulties which include intermetallic formation. In this paper laser welding of 1.2 mm Al 5754 series to 0.8 mm Zn coated steel was used to lap joint using linear energy output of 18-30 kJ/m. The welds were first inspected for surface defects using stereo-microscope and crack-free samples were metallurgical prepare for characterisation. The results show that samples with deeper penetration had low shear strength than samples with shallow welds.
F-22: Microstructure Analysis of Graded Interface Layers in a Model Multilayer Al/Al-Zn/Al by Scanning Microbeam Small-angle X-ray Scattering Measurements: Shan Lin1; Hiroshi Okuda1; Higashino Yukihiro1; Katsushi Matsumoto2; Kazufumi Sato3; 1Kyoto University; 2Kobe Steel, Ltd.; 3Kobelco Research Institute, Inc.
The distribution of precipitation microstructures in the interdiffusion layer of a model multilayers of Al / Al-Zn alloy / Al with a total thickness of about 3 mm was examined using microbeam small-angle X-ray scattering (SAXS) measurements. The change of scattering profiles across the graded interfacial layers reflected the spatial change in the volume fraction, average size, and size distribution in the sample. Microstructural parameters obtained from the SAXS analysis explained the hardness change in the interface area. The present results suggest that small-angle scattering analysis using a scanning microbeam is a useful tool to examine the microstructural distribution and predict the properties of the interface region in multilayer composite sheets, in particular, the microstructure and properties of transient interfacial layers. Present work is based on results obtained from a project commissioned by the New Energy and Industrial Technology Development Organization (NEDO).
F-23: Self-healing Aluminium Alloys: Irena Paulin1; Črtomir Donik1; Matjaž Godec1; 1Institut for Metals and Technology
Self-healing aluminium alloys are new generation of light metals with high strength, good corrosion resistant and well transformability. Adding a new property, possibility of self-healing process, to this excellent materials, the outstanding light metals are being developed. Aluminium alloys are employed extensively for aircraft and automobile applications. In both cases the application is limited by slow fatigue damage evolution during service. If crack growth could be postponed the life span of components would be increased and the frequency of inspections reduced. An intriguing concept to achieve this is the incorporation of self-healing mechanisms into engineering materials. Self-healing of damage is an important concept in biological materials but is, so far, not common in engineering materials. Aluminium alloys, particularly, have been considered because they show, even at room temperature. In our study, aluminium alloy of series AA 7xxx is being developed.
F-25: Synergistic Effects of Cu and Zr V on Microstructure and Mechanical Properties of Al-Si-Mg Cast Alloy: Mingshan Zhang1; Junsheng Wang1; 1Beijing Institute of Technology
Abstract: Al-Si-Mg cast aluminum alloys encounter challenges in strength, especially high temperature mechanical properties. Generally, when Cu element is added to Al-Si-Mg alloy, the alloy can form more stable Cu-containing intermetallic compounds, such as θ-Al2Cu and Q-Al5Cu2Mg8Si6. As the mechanical properties of alloys are also related to grain size. Transition metals Zr and V can refine grain size. Moreover, due to the low diffusivity and solubility of Zr and V elements in Al, a fine dispersion distribution Al3M phase can be formed to resist coarsening at high temperature, which can improve the high-temperature mechanical properties. Therefore, this paper takes Al-Si-Mg cast aluminum alloy as the research object to explore the influence of Cu and Transition metals Zr and V on as-cast microstructure and mechanical properties, providing a theoretical basis for the development of automotive lightweight.Keywords: Al-Si-Cu-Mg alloy；Transition metals ；Eutectic silicon；grain refinement；Microstructure properties
F-26: The Effect of Initial Precipitates on Shear Deformation in 6061 Aluminium Alloy: Wonkee Chae1; JunHyun Han1; 1Chungnam National University
As global warming accelerates, aluminium alloy with high specific strength has drawn attention for weight reduction of car bodies. However, the formability of aluminium is generally inferior to that of steel sheets. It is well known that the formability of the metal sheets with a FCC structure can be greatly improved by the presence of the <111>//ND textures. Asymmetric rolling is a process which improves the formability of aluminium sheets by introducing an intense shear deformation and the <111>//ND textures. Because 6061 aluminium alloy is a precipitation-hardening alloy, containing magnesium and silicon as its major alloying elements, it is necessary to identify the effects of precipitates on shear deformation and texture control. In this research, the effect of initial precipitates on shear deformation in 6061 aluminium alloy was studied. The formability by initial precipitates was evaluated and the texture of the rolled aluminium alloy sheets was analyzed.
F-27: The Effect of Profile Shape on Crystallographic Texture of Extruded 6xxx High Strength Aluminium Alloy: Chrysoula Tzileroglou1; Isaac Chang1; 1Brunel University London
A new class of aluminium alloys show enhanced mechanical properties, which has been partially attributed to a careful design of chemical composition and process. Recent work on an extruded high strength 6xxx Al alloy has shown that the mechanical properties may be influenced by its crystallographic texture. This contribution presents detailed studies of the effect of profile shape on resultant microstructure, micro-texture and tensile properties of Al 6xxx alloy. All extruded samples exhibit a fibrous microstructure. However, the average grain size increased rapidly from thin to bulk geometries. In addition, the texture changed from similar to rolling for thin profiles to that typical of extrusion for bulk. Finally, the same aluminium alloy exhibits a mechanical property profile that depends on its shape, which can be correlated with differences in crystallographic texture. This clearly shows that the strength could be engineered through the control of microstructure and crystallographic texture during extrusion.
F-28: The Effect of Zinc Addition on Corrosion Resistance and Mechanical Properties of Recycled Aluminium Cans: Ademola Agbeleye1; Atinuke Oladoye1; Babatunde Bolasodun1; Samson Adeosun2; 1University of Lagos; 2University of Lagos, Akoka
Recycled aluminium cans are usually used for the production of new cans and other valuable aluminium products such as engine blocks, building facades, bicycles, menu trays, etc. This study investigates the effect of 0-2% zinc addition on the microstructure, corrosion resistance and mechanical properties of recycled aluminium beverage cans. Metallographic examination of the samples showed considerable grains refinement due to the addition of zinc. The results of the potentiodynamics test using 1M HNO3 revealed increase in the corrosion resistance of the samples with increase in zinc addition. The mechanical tests showed a drop in the Vickers-hardness value at 1% zinc addition. However, further increase in zinc improved the hardness of the sample. The UTS increased significantly with the addition of zinc but there was a drop to about 97.2 MPa at 0.75 wt. % zinc. The ductility and impact energy of the samples generally increased with increase in zinc addition.
F-29: The Evaluaion of Forged Aluminum Heat Sink for LED Headlight of Automobile: Young-Sek Yang1; Geun Woo Lee1; Chang Ho Yoon1; 1Foosung Precision Ind. Co., Ltd.
Recently, appling LED(Light-emitting diode) headlight to the automobile has been increasing and the trend has also led from luxury cars to low and mid-price cars because of its advantages; great energy efficiency, longer life, eco-friendly, and its ability to provide positively influencing vehicle design. But, LED performance and lifetime are strong factors of its temperature. Therefore, the effective cooling of LED light system is very important issue. In this study, forged aluminum heat sink(A1050) which has cylindrical pins' arrangement that extended from its base was produced and its performance was compared with an existing straight fin heat sink(ADC12) which was produced by die casting process. Results show that although the surface area of forged heat sink was 189cm² while die casting heat sink had 268cm², its performance was better than die casting heat sink. Moreover, the weight of forged heat sink reduced 30% compared to die casting heat sink.
Cancelled
F-30: The Role of In-situ Stacking Faults and Twins in the Deformation Behavior of New Al Alloys: Miran Joo1; Jeheon Jeon1; Donghyun Bae1; 1Yonsei University
Al alloys generally induce plastic flow via the glide of dislocations at low temperatures due to their high stacking fault energy (SFE). However, in-situ stacking faults (SFs, ~10 nm) are formed in new Al alloys, which is fabricated by using the conventional casting process. The alloyed elements might affect the formation of SFs. In-situ SFs play an important role in the deformation behavior under uniaxial tension including strong interaction of SFs with dislocations and the expansion of SFs during plastic deformation. Therefore, the strain hardening capacity of I-Al is improved with higher n value of I-Al (~0.32) compared to that of Al (~0.23), which contributes to the increase of ductility and ultimate tensile strength of I-Al. Under plane-strain tension, SFs are modified as nano/micro twins beyond critical stress. Microtwins may be formed by rearranging atomic displacement near the SFs in the direction of their length up to hundreds of nanometers.