Effect of pulsed magnetic field treatment on properties and microstructure of 7075 aluminum alloy

doi:10.13251/j.issn.0254-6051.2021.09.029

Abstract

Abstract: The 7075 aluminum alloy was treated by pulsed magnetic field, and the mechanical properties and microstructure of the alloy before and after pulsed magnetic field treatment were studied by using room temperature tensile test, SEM, TEM and XRD testing methods. The results show that pulsed magnetic fields with peak intensity of 2 T and 3 T can increase the microscopic strain of the alloy and promote the transformation of the preferred orientation of grains from (200) crystal planes to (111) crystal planes, but it does not significantly affect the tensile properties of the alloy. A pulsed magnetic field with a peak intensity of 1 T can significantly promote the re-dissolution of the small-sized second phase inside the alloy, weaken the continuity of the grain boundary precipitation phase, and broaden the width of the grain boundary precipitation-free zone, so that the plasticity of the 7075 aluminum alloy can be improved without reducing the strength.

Key words: 7075 aluminum alloy, pulsed magnetic field treatment, microstructure, properties

CLC Number:

TG146.21

Shi Yazhou, Lu Guangping, Gao Yi, Liao Chengzhi, Yang Yi. Effect of pulsed magnetic field treatment on properties and microstructure of 7075 aluminum alloy[J]. Heat Treatment of Metals, 2021, 46(9): 159-163.

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