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The improvement mechanism of good matching between electrical conductivity and mechanical properties for Al-4Si-0.8Mg-0.6Fe alloy
Journal of Alloys and Compounds ( IF 6.2 ) Pub Date : 2022-11-30 , DOI: 10.1016/j.jallcom.2022.168275
Xiaoli Cui, Hui Ye, Houyun Liu, Xinghui Li, Qianming Man, Hui Li, Hongwei Cui, Rui Feng, Yaokun Pan

The contradictory relationship between electrical conductivity (abbreviate to EC) and mechanical properties limits the development of conductive aluminum alloys obviously. Nowadays, it is a challenge to put forward a strategy to improve EC and mechanical properties of Al alloy simultaneously. In this paper, composite boron treatment, alloying treatment, hot extrusion and heat treatment were proceed to improve the EC and mechanical properties of Al-4Si-0.8Mg-0.6Fe alloy and the corresponding improvement mechanism was analyzed. Through the above processes, Al matrix is purified and a large amount of plate-like Si are refined into equiaxed form with rod-like. What’s more, granular Fe/Mg-rich phases with small size as precipitations make main contribution to the excellent mechanical properties. Finally, a new Al-4Si-0.8Mg-0.6Fe alloy with good matching between electrical conductivity and mechanical properties was fabricated and its EC, vickers hardness (HV), Yield strength (YS), ultimate tensile strength and elongation are (52.1 ± 0.3) %IACS, (80 ± 1) HV, (194 ± 3) MPa, (227 ± 3) MPa, and (18.9 ± 0.2)%, respectively.



中文翻译:

Al-4Si-0.8Mg-0.6Fe合金导电性能与力学性能良好匹配的改进机制

导电性(简称EC)与力学性能之间的矛盾关系明显限制了导电铝合金的发展。如今,提出同时提高铝合金EC和力学性能的策略是一个挑战。本文通过复合硼处理、合金化处理、热挤压和热处理等方法来提高Al-4Si-0.8Mg-0.6Fe合金的EC和力学性能,并分析了相应的改进机理。通过以上过程,Al基体得到提纯,大量板状Si被细化为棒状的等轴状。更重要的是,作为析出物的小尺寸粒状富 Fe/Mg 相是优异机械性能的主要贡献因素。最后是新的 Al-4Si-0.8Mg-0。

更新日期:2022-11-30
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