Aluminum Alloys, Processing and Characterization: Processing of Aluminium Alloys
Sponsored by: TMS Light Metals Division, TMS: Aluminum Committee
Program Organizers: Dmitry Eskin, Brunel University
Thursday 8:30 AM
February 27, 2020
Room: 1A
Location: San Diego Convention Ctr
Session Chair: Dimitry Sediako, University of British Columbia
8:30 AM Introductory Comments
8:35 AM
Influence of Chemical Composition and Pre-deformation on The Age-hardening Response of Al-Mg-Si Alloys: Alexander Wimmer1; 1Neuman Aluminium
Al-Mg-Si (6xxx) alloys are widely used in the lightweight construction of automotive structures. In addition to lightweighting, the recycling of aluminum alloys plays an important role for the optimization of the carbon footprint in the automotive industry. On the one hand, optimized Al-Mg-Si alloys require a narrow tolerance window, both for chemistry and process parameters, on the other hand, increasing recycling rates are a challenge for reaching a defined chemistry. In this work the influence of alloy chemistry, grain size, pre-deformation and natural/artificial ageing parameters such as quench rate and time/temperature profiles were analyzed. 20 different Al-Mg-Si alloys, both with and without Cu, quench rates from 500K/min to 30,000K/min and ageing procedures including and excluding pre-deformation and natural ageing were systematically examined. For the alloy 6082 (AlMgSiMn) yield strength values above 400MPa and elongation to fracture values exceeding 20% were measured.
9:00 AM
Hot Deformation and Die-quenching of 6000-series Alloys - the Effect of Quench-interruption Temperature: Tanja Pettersen1; Benedikte Jĝrgensen Myrold2; Calin Marioara1; Ola Jensrud2; 1SINTEF Industry; 2SINTEF Manufacturing
The automotive industry face demands to produce lightweight vehicles and substituting steel with aluminium is a straightforward solution. Age hardenable aluminium alloys are attractive candidates when the aim is a combination of high strength and good ductility. To obtain a solution that is suitable for high-volume production, an integrated hot forming and in-die quenching process has been developed. However, this method changes the temperature exposure of the part and alters the precipitation and clustering sequence during hardening. In the present work, the effect of the modified temperature sequence has been investigated. The method has been experimentally simulated by application of a water-cooled compression tool combined with subsequent age-hardening. The temperature experienced by the blank has been measured throughout the process, and the effect of variations in the quench-interruption temperature has been investigated. The results indicate that there is little difference in strength and hardness by changing the closed-die time.
9:25 AM
Descriptors and Predictors: New Tools for the Predictive Modelling of Production Paths and the Properties of Aluminum-based End-products: Varuzan Kevorkijan1; Irena Paulin2; Crtomir Donik3; 1Impol R in R d.o.o.; 2Institute for Metals and Technology; 3IMT Ljubljana
The processing-path vectors that describe industrial processes usually consist of a few hundreds of components. Therefore, modelling with such vectors is difficult and often lacks sufficient accuracy for industrial applications. A possible solution is to replace them with the much simpler mathematical structures called descriptors. In the vector space used in this work, the descriptor is the distance between the vector of the selected and the vector of the average processing path. The next step in finding a sufficiently strong correlation between the processing paths and the set of properties, is to calculate the conditional probabilities of all the available pairs. The predictor, the tool used in this study, is a triplet of data giving the probability higher than that required, that the processing path will result in a particular set of properties. The algorithm was successfully validated in an industrial production of forging rods made from AA6082.
9:50 AM
Effects of Extrusion Parameters on Microstructural and Mechanical Properties of EN AW 6063: Mehmet Bugra Guner1; Cem Mehmetalioğlu1; Osman Halil Çelik1; Murat Konar1; Görkem Özçelik1; 1ASAS Aluminium
Aluminium extrusion is a temperature effected solid state shaping mechanism and its raw material is aluminium billets. Direct extrusion method uses them to move them out trough the aluminium dies. The die geometry has got extensive effects on the final properties, for extruded profiles. Apart from die geometry, extrusion parameters also have got very dramatic effects on microstructures of aluminium alloys. These parameters could be seperated into the two main topics. One is temperature affected parameters and the other one is deformation affected parameters.In this study, effects of different extrusion speeds and billet heating temperatures on microstructural properties of EN AW 6063 alloy were investigated with precise characterisation techniques. These microstructural analysis were also verified with computer aided extrusion simulation software (QForm). Finally, mechanical characterisation was also performed to determine the mechanical properties of samples with tensile testing.
10:15 AM Break
10:30 AM
Characterization of Dynamic Material Property of AlSi10Mg Aluminum Alloy Under High Strain Rate Compressive Loading: Md Salah Uddin1; Kristofer Kuelper1; Brahmananda Pramanik1; 1Montana Technological University
The aim of this paper is to characterize the dynamic material property of the aluminum alloy, AlSi10Mg under high strain rate compressive loading. From literature reviews, it was found that the characteristic of dynamic deformation behaviors of aluminum alloys under both compressive and tensile loading conditions by using split Hopkinson pressure bar techniques were different. In this work, we performed experiments at high strain rate compressive loadings on selective laser melted (SLM) samples with a split Hopkinson pressure bar. The samples were produced at five different layer orientations, such as 0⁰, 30⁰, 45⁰, 60⁰, and 90⁰ with three different global energy density (GED) values. The GED value of a sample is related to laser power, scan speed, hatch spacing, and layer thickness of the SLM process. In our study, we found the characteristic material deformation behavior depends on building layer orientations and the GED values.
10:55 AM Student
Current Efficiency for Direct Production of an Aluminium- titanium Alloy by Electrolysis in a Laboratory Cell: Omar Awayssa1; Rauan Meirbekova2; Gudrun Saevarsdottir2; Gudjon Atli Audunsson3; Geir Martin Haarberg1; 1Norwegian University of Science and Technology; 2Reykjavik University; 3Innovation Center Iceland
This paper reports a study on the electrochemical synthesis of an aluminium-titanium alloy in-situ during aluminium reduction in fluoride-based melts. Experiments were carried out in a controlled laboratory cell with a carbon anode and a liquid aluminium cathode using industrial standards for temperature, cryolite ratio, and current density. TiO2 was added as a raw material along with alumina. Bath samples were collected regularly and analyzed with ICP-MS to estimate the co-deposition rate of titanium during the experiment. Apparent current efficiencies were recorded, and analysis of deposit was carried out by ICP-MS to complete the material balance in order to calculate the real current efficiencies. The content of titanium was varied up to 1.0 wt.% and alumina concentration in the bath was below saturation.
11:20 AM Cancelled
Simulation Study on Equal Channel Right Angular Extrusion Process of Aluminum Alloy 6061: Wenhuan Jiang1; Liangying Wen1; Huan Yang1; Jiahuan Jiang1; 1Chongqing University
Simulation of aluminum alloy 6061 equal channel right angle extrusion is carried out by using Deform-3D finite element software. The microstructure changes before and after extrusion deformation are investigated through experiment corresponding to simulation working condition. The results show that the uniformity of the deformation process is affected by factors such as friction coefficient and extrusion paths. There are a number of long bands of aggregates along the shear direction after a single pass extrusion. For two passes deformation of the same path, the orientation of the grains is significantly enhanced, and the proportion of the large angle grain boundaries is increased. Meanwhile, affected by the friction factor, in the surface layer of the sample, the grain length is alternately distributed in strips, and the direction of the grain stretching is at an angle of 0 to 45° with the friction surface of the extrusion channel.