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Influence of Ca and Mn on Microstructure, Mechanical Properties, and Electrical Conductivity of As-Cast and Heat-Treated Al-Mg-Si Alloys
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1.College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;2.Shanxi Key Laboratory of Advanced Magnesium-Based Materials, Taiyuan University of Technology, Taiyuan 030024, China;3.Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China

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Fund Project:

National Natural Science Foundation of China (52175355); National Key Research and Development Program (2018YFA0707304); Shanxi Provincial Key Research and Development Program (201903D121087)

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    Abstract:

    The Al-0.59Mg-0.54Si-X (X=0, 0.253Ca, 0.253Mn) alloys were prepared to investigate the effect of minor addition of Ca and Mn on the microstructure, mechanical properties, and electrical conductivity of the Al-0.59Mg-0.54Si-X alloys after casting, solid-solution, and aging treatments. Results show that the Ca and Mn addition can significantly refine the grains of α-Al matrix. Moreover, Ca can induce the precipitation of Mg2Si and Al2Ca particles with high contents in the as-cast α-Al grains, which contributes to the optimum mechanical properties of alloys. The solid-solution and aging treatments cause the coarsening of particles and the particle segregation at the grain boundaries, leading to the rapid decline in mechanical properties but an extraordinary increase in electrical conductivity (52.44%IACS) for the alloys. Mn addition can transform the coarse β-Al5FeSi impurity phase at the grain boundaries into the α-Al(FeMn)Si particles and also induce the precipitation of Mg2Si and AlMn particles in the as-cast alloys. Consequently, the Al-0.59Mg-0.54Si-0.253Mn alloy after solid-solution and aging treatment exhibits the optimal mechanical properties and acceptable electrical conductivity.

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[Zheng Yi, Bian Liping, Ji Hongliang, Liu Xianwen, Tian Feng. Influence of Ca and Mn on Microstructure, Mechanical Properties, and Electrical Conductivity of As-Cast and Heat-Treated Al-Mg-Si Alloys[J]. Rare Metal Materials and Engineering,2022,51(11):4010~4020.]
DOI:10.12442/j. issn.1002-185X. E20220002

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History
  • Received:March 06,2022
  • Revised:April 24,2022
  • Adopted:May 10,2022
  • Online: December 07,2022
  • Published: November 30,2022