Application of hot workability studies to extrusion processing. Part III: Physical and mechanical metallurgy of Al-Mg-Si and Al-Zn-Mg alloys5 |
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| Affiliation: | 2. Comaleo Research Centre, Melbourne, Vic. 3074, Australia;1. School of Mechanical Engineering, REVA University, Bengaluru, India;2. Department of Mechanical Engineering, Acharya Institute of Technology, Bengaluru, India;3. Department of Mechanical Engineering, Yenepoya Institute of Technology, Mangalore, India;1. State Key Lab of Metal Matrix Composites, School of Material Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA;3. Technology R & D, Semiconductor Manufacturing International Corporation, Shanghai 201203, China;1. Key Laboratory of Aerospace Advanced Materials and Performance of Ministry of Education, School of Materials Science and Engineering, Beihang University, Beijing 100191, China;2. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China;3. Center for Advanced Die Engineering and Technology, Gifu University, 1-1 Yanagido, Gifu City, Gifu 501-1193, Japan |
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| Abstract: | The conditions for homogenisation and cooling to improve the extrusion velocity and surface quality are derived from analysis of the influence of solidification segregation and constitutive particles in lowering the minimum melting temperature. Over-aged particles of Mg2Si do not reduce surface quality as do large equilibrium ones and do not raise the strength as much as Mg and Si in solution. A Si level above the Mg2Si ratio augments the hot strength less than excess Mg and strengthens the extrudate while diminishing toughness. During homogenisation cooling and pre-heating, the precipitates in both Al-Mg Si and Al-Zn-Mg alloys must be limited in size to permit solution as they pass through the extrusion zone. Both alloys have low quench sensitivity suiting them for rapid cooling upon exit from the press so that the extrudate is ready for age hardening. The influence of additional elements such as Cu, Mn, Zr and Cr on both extrusion process and product are reviewed. |
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