Effect of pulsed magnetic field on microstructure and mechanical properties of 7A04 aluminum alloy under solution treatment

doi:10.13251/j.issn.0254-6051.2022.09.011

Abstract

Abstract: Effect of pulsed magnetic field parameters on the microstructure and mechanical properties of 7A04 aluminum alloy under solution treatment was investigated by means of optical microscope, scanning electron microscope, Vickers hardness tester and universal testing machine. The results show that the pulsed magnetic field can promote the decomposition of S phase and accelerate the diffusion of its alloying elements, so as to obtain the solid solution structure with better saturation. After pulsed magnetic field solution treatment of 60 min, the tensile strength of the solution treated 7A04 aluminum alloy is increased by about 96 MPa, the microhardness is increased by about 20 HV50, and the elongation is decreased by about 0.9%. In the process of solution treatment of 7A04 aluminum alloy, the pulsed magnetic field is increasing the diffusion coefficient by reducing the diffusion activation energy of solute atoms, the solution process is accelerated, so that the solution treatment time is shortened.

Key words: pulsed magnetic field, S phase, 7A04 aluminum alloy, solution treatment process

CLC Number:

TG148

Cheng Qiao, Wang Jun, Xu Liang, Tian Jianming, Chen Zhongyi, Ma Yonglin. Effect of pulsed magnetic field on microstructure and mechanical properties of 7A04 aluminum alloy under solution treatment[J]. Heat Treatment of Metals, 2022, 47(9): 60-64.

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