Transactions of Materials and Heat Treatment

Title：Influence of Zn contents on properties and microstructure of aluminum alloy 7XXX

Authors： Tang Renkui

Unit： Chongqing Creation Vocational College

KeyWords： aluminum alloy 7XXX mold casting microstructure Zn content fluidity

ClassificationCode：TG113

year,vol(issue):pagenumber：2017,42(4):184-187

Abstract：

In order to further study the influence of composition of aluminum alloy 7XXX on material performance, the performance and microstructure of Al-based alloys with high content of Zn produced by mold casting were researched, and the influence of Zn content on the microstructure, mechanical properties and casting fluidity were studied. The results show that when the content of Zn increases from 20% to 40%, the influences on microstructure are that the average grain size decreases from 45 μm to about 20 μm, and the non-equilibrium phase α+η volume fraction at the grain boundary increases from 9% to 28%. Moreover, the influences on mechanical properties are that the tensile strength and yield strength increase to 470 MPa and 430 MPa respectively, the elongation decreases from 7% to 3%, and the alloy hardness value improves from 75 HV up to 140 HV. At the same time, the increase of Zn content can reduce the solidus temperature of alloy, and the fluidity of alloy is improved.

Funds：

唐仁奎（1974-），男，硕士，讲师 E-mail：tangrk1@163.com

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