Effect of Si on microstructure and properties of Al-1.5Cu-0.7Mg alloy

doi:10.13251/j.issn.0254-6051.2024.02.008

Abstract

Abstract: Effect of 0.3wt%Si addition on the microstructure and mechanical properties of Al-1.5Cu-0.7Mg alloy was studied by means of mechanical test, resistivity test at 20 ℃ and microstructure observation. The results show that with the 0.3wt%Si addition, the as-aged strength of the tested alloy is obviously increased. After peak aging at 473-493 K, its 20 ℃ resistivity is 3.638-3.667 μΩ·cm, and its tensile strength is 370-380 MPa, and then the relationship between the 20 ℃ resistivity and the relative volume fraction of the second phase precipitated during aging is established according to Matthiessen rule. The second phase precipitation activation energies in aging of the Al-1.5Cu-0.7Mg and Al-1.5Cu-0.7Mg-0.3Si alloys obtained by using JMA (Johnson-Mehl-Avrami) equation are 135 kJ/mol and 204 kJ/mol respectively, according to which to know that the S″ phase is dominant in the Al-1.5Cu-0.7Mg alloy and the S phase is dominant in the Al-1.5Cu-0.7Mg-0.3Si alloy. The resistivity under other aging parameters is also predicted by JMA equation, and the accuracy of the prediction model is all over 99%.

Key words: Al-1.5Cu-0.7Mg alloy, Si, resistivity, tensile strength, second phase, precipitation activation energy

CLC Number:

TG166.3

Tan Xinyu, Liu Jingjing, Liu Dongyu. Effect of Si on microstructure and properties of Al-1.5Cu-0.7Mg alloy[J]. Heat Treatment of Metals, 2024, 49(2): 53-59.

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