Effect of magnesium and heat treatment on electrical conductivity andmechanical properties of Al-4Si-(xMg) alloys

doi:10.13251/j.issn.0254-6051.2021.01.019

Abstract

Abstract: Effects of Mg addition and different heat treatments on the electrical conductivity and hardness of Al-4Si-(xMg) (x=0-1.5%,mass fraction) alloys were analyzed by SEM,XRD,EDS,hardness tester and resistivity tester.The results show that for the as-cast alloys,the electrical conductivity and hardness increase first and then decrease with the increase of Mg addition and 1.1% is the optimum addition of Mg,while the Mg addition significantly improves the hardness,but damages the electrical conductivity.After different heat treatments,the electrical conductivity of Al-4Si-(xMg) alloys greatly increases and the hardness slightly decreases,where the solid solution+aging treatment significantly increase the electrical conductivity but reduce the hardness to the minimum,so that the Al-4Si-1.1Mg alloy has the best matching between electrical conductivity and hardness.Through the synergistic effect of Mg addition and solid solution+aging treatment,the electrical conductivity of the as-cast Al-4Si alloy can be improved from 43.3%IACS to 50.9%IACS,the hardness can be increased from 41.5 HV0.5 to 84.3 HV0.5.

Key words: magnesium element, heat treatment, Al-4Si alloy, electrical conductivity, hardness

CLC Number:

Ye Hui, Cui Xiaoli, Cui Hongwei, Li Xinghui, Zhu Ze, Zhao Juan. Effect of magnesium and heat treatment on electrical conductivity andmechanical properties of Al-4Si-(xMg) alloys[J]. Heat Treatment of Metals, 2021, 46(1): 97-103.

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