Effect of Mg content on microstructure and mechanical properties of 2A14 aluminum alloy

doi:10.13251/j.issn.0254-6051.2022.04.014

Abstract

Abstract: Effect of different Mg contents on microstructure and mechanical properties of 2A14 aluminum alloy were studied by means of optical microscope (OM), scanning electron microscopy (SEM), hardness tester, tensile tester and impact tester. The results show that with the increase of Mg content, the residual crystalline phase in the aged alloy increases obviously, the strength increases first and then decreases, and the impact property decreases slightly when the strength is the highest. The increase of Mg content promotes the formation of Cu-Mg clusters, which provides nucleation sites for subsequent θ′ and Q′ phases, so that the number of θ′ and Q′ increases significantly and the strength increases accordingly. However, excessive Mg content significantly increases the residual crystalline phases (Al₂Cu, AlCuMgSi, AlSiMnFe, etc), resulting in stress concentration, which reduces impact property and tensile properties.

Key words: Mg content, residual crystalline phase, aging precipitates, tensile properties, impact property

CLC Number:

TG146

Chen Sijun , Chen Songyi, Chen Geng, Yuan Dingling, Chen Kanghua. Effect of Mg content on microstructure and mechanical properties of 2A14 aluminum alloy[J]. Heat Treatment of Metals, 2022, 47(4): 86-92.

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