Influence of aging processes on microstructure and properties of Al-Zn-Mg-Cu aluminium alloy

doi:10.13251/j.issn.0254-6051.2020.04.032

Abstract

Abstract: The influence of aging processes (including one-step, two-step and three-step aging) on the microstructure and properties of Al-Zn-Mg-Cu aluminium alloy with Ti addition was studied by alloy preparation and heat treatments. The as-cast microstructure, distribution patterns of phase precipitation, mechanical properties after aging and fracture morphology of the alloy were studied by OM, SEM, microcomputer controlled universal testing machine and microhardness tester. The results show that adding Ti can refine the grain size, reduce the dendritic segregation and strengthen the alloy. The strength of the alloy reaches its maximum of 586 MPa in the one-step aging process. But in the three-step aging process, the alloy has the highest hardness (183.2 HV0.1) and the best elongation (8.8%) with the strength (579 MPa) equivalent to that in the one-step aging process. It is revealed that the three-step aging treatment can achieve the most significant improvement in the mechanical properties of the alloy.

Key words: Al-Zn-Mg-Cu aluminum alloy, aging process, secondary phase precipitation, Ti, grain refinement strengthening

CLC Number:

TG146.21

Xu Xuefang, Wang Chunhua. Influence of aging processes on microstructure and properties of Al-Zn-Mg-Cu aluminium alloy[J]. Heat Treatment of Metals, 2020, 45(4): 152-155.

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