Thermal deformation behavior of novel Al-Mg-Si-RE alloys

doi:10.13251/j.issn.0254-6051.2022.11.031

Abstract

Abstract: Four novel Al-Mg-Si alloys with different Mg/Si ratios and additions of Zr and B, and rare earth elements (Ce and Er) were designed and prepared, and the microstructure, electrical conductivity and tensile strength were studied. Then taking the Al-Mg-Si-RE alloy with a optimum chemical composition as the research object, the thermal compression test was carried out by Gleeble-3500 thermal simulator, and the thermal deformation behavior of the alloy was studied with the deformation temperature of 300-450 ℃ and the strain rate of 0.001-1 s^-1. The constitutive equation and hot processing map of the alloy were constructed through experimental data, and the evolution of microstructure was studied by optical microscope. The results show that when the Mg/Si ratio is 1.4, the alloy has excellent properties. The flow stress of the alloy decreases with the increase of deformation temperature and the decrease of the strain rate. The thermal deformation activation energy of the alloy is calculated to be 176.188 kJ/mol, the constitutive equation obtained has a guiding effect on the flow behavior of the alloy. The hot processing map shows that the suitable processing regimes are deformation temperature of 300-320 ℃, strain rate of 0.001-0.015 s^-1, and deformation temperature of 430-450 ℃, strain rate near 0.001 s^-1or 1 s^-1.

Key words: novel Al-Mg-Si-RE alloy, thermal compression, microstructure, constitutive equation, hot processing map

CLC Number:

TG146.2

Ren Yupeng, Liu Ping, Chen Xiaohong, Zhou Honglei, Liang Xiaofei. Thermal deformation behavior of novel Al-Mg-Si-RE alloys[J]. Heat Treatment of Metals, 2022, 47(11): 168-177.

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