Aluminum Alloys, Processing and Characterization: Alloy Development and Applications
Sponsored by: TMS Light Metals Division, TMS: Aluminum Committee
Program Organizers: Yanjun Li, Norwegian University of Science and Technology
Monday 2:00 PM
February 27, 2017
Location: San Diego Convention Ctr
Session Chair: In-Ho Jung, McGill University
2:00 PM Introductory Comments
2:05 PM Keynote
Aluminium, Current and Future Development: Juergen Hirsch1; 1Hydro Aluminium Rolled Products GmbH
In recent decades Aluminium has become the most important metal – besides steel – and the winner in numerous competitions for the best suited material. Aluminium with its specific versatile properties and suitable adapted alloys became the fastest growing metal for various products worldwide. The success story of Aluminium is illustrated by historic and recent developments in various markets, like packaging, printing, and especially in lightweight construction in architecture and transportation. Many innovative solutions are discussed which explain the steady growing.
Design of New 6xxx Series Al Alloy Using the CALPHAD Thermodynamic Database: Senlin Cui1; Raja Mishra2; In-Ho Jung1; 1McGill University; 2General Motors R&D Center
A comprehensive and accurate thermodynamic database for Al 6xxx series alloy encompassing Al-Mg-Si-Cu-Fe-Mn-Cr has been developed based on the critical evaluation and optimization of all available literature data and new phase diagram experiment. Based on this database, the thermodynamic calculations are performed to understand the phase evolution during casting, homogenization and final tempering process. In particular, the equilibrium phase fraction diagrams of all the possible precipitate phases are mapped in the composition range of 0-1.1 wt.% Mg and 0-0.7 wt.% Si at various processing temperatures. The influence of the variation of minor alloying/impurity elements such as Cu, Fe, Mn, and Cr to the amount of each type of precipitates is also taken into account. Considering conventional Al processing technologies from casting, homogenization, extrusion, and final age-hardening stages, the calculation results will be interpreted for logical Al alloy design.
Study of an Al-Ca Alloy with Low Young's Modulus: Jun Yu1; Yasuo Ishiwata1; Yoshihiro Taguchi1; Daisuke Shimosaka1; Ryosuke Taniguchi1; Takutoshi Kondo2; Nobuki Tezuka3; 1Nippon Light Metal; 2Nikkei Niigata co. ltd; 3Tohoku University
Al-Ca alloys are known for their low Young’s Modulus as they contain Al4Ca. While as the demand for low rigidity materials is limited, properties and production methods of Al-Ca alloys have not been well studied. Al-Ca alloys have low Young’s Modulus, but also low strength. A small amount of Fe addition into an Al-Ca alloy does not inhibit the formation of Al4Ca, so Young’s Modulus remains low. In this work, in order to achieve low Young’s Modulus and higher strength, an Al-Ca alloy with Fe addition was prepared by Direct-Chill casting, extrusion and rolling, microstructure and mechanical properties were researched after every process. After extrusion and rolling processes, strength of the alloy could be increased, but Young’s Modulus was also increased. As a result, by adding heat treatment after extrusion and rolling, an Al-Ca alloy with increased strength and low Young’s Modulus of less than 55 GPa was successfully developed.
Production of 3004 Aluminum Alloy Sheet for Structural Applications from Twin Roll Casting: Ali Malcıoğlu1; Seda Ertan1; 1ASAŞ Alüminyum Sanayi ve Ticaret A.Ş.
3004 aluminum alloys have received wide range in automotive, packaging and building industries due to it is high strength, high corrosion resistance and good machinability. Besides, 3004 alloys commonly produced by Direct Chill Casting method. Furthermore, Twin Roll Casting method which is an alternative of traditional method, came forward in recent years. In the present work; 3004 aluminum alloys were prepared by twin roll casting. Aiming the high strength and good bendability, alternative thermo-mechanical processes were done in laboratories using laboratory mill and furnace. Mechanical tests were performed for indicating the required temper designation. Characterization of the samples was accomplished through metallographic investigation in order to examine the effect of process parameters and examining the morphology. In addition to this, Vickers micro-hardness, electrical conductivity tests and bending tests were performed on the samples for the characterization.
3:50 PM Break
Aluminum Alloys with Tailored TiB2 Particles for Composite Applications: Xingtao Liu1; Yanfei Liu1; David Yan2; Qingyou Han1; Xiaoming Wang1; 1Purdue University; 2University of Wisconsin-Green Bay
In-situ formed TiB2 particles are dispersed into aluminum alloys to improve their mechanical properties. The TiB2 particles are produced by chemical reactions of K2TiF6 and KBF4 with aluminum and are subsequently dispersed in the aluminum alloys as reinforcement. Through adjusting the processing chemistry of the molten salts, TiB2 particles can be tailored to desired morphologies and sizes for particular properties. To improve the dispersion of the TiB2 particles, titanium is added as alloying element to promote the nucleation of aluminum grains on the TiB2 particles. The results are discussed in view of surface energy and heterogeneous nucleation of aluminum grains in solidification.
Development of Low Expansion and High Strength Aluminium Hybrid Composite: Jamuna Sethi1; Siddhartha Das1; Karabi Das1; 1Indian Institute of Technology Kharagpur
An aluminum (Al) matrix hybrid composite reinforced with yttrium tungstate (Y2W3O12) and aluminium nitride (AlN) synthesized by high energy ball milling followed by compaction and sintering. Y2W3O12,a negative thermal expansion material (-7.1x10-7/⁰C), is chosen as one of the reinforcements to lower the coefficient of thermal expansion (CTE). AlN is added to the composite in order to improve strength and thermal conductivity. X-ray diffraction patterns reveal the presence of Al, AlN, and Y2W3O12 peaks indicating no chemical reaction between the matrix and reinforcements. The scanning electron micrograph shows fairly uniform dispersion of reinforcements in the matrix. Hardness, elastic modulus and CTE were measured by Vickers’s hardness tester, nano-indentation test, and dilatometer, respectively. It is observed that a composite with high hardness, high Young’s modulus and low CTE can be obtained by adding 15 wt%AlN and 30 wt%Y2W3O12.
4:55 PM Poster Session Previews Select poster presenters in the Tuesday, February 28 poster session will give five-minute previews of their work during this time.