Effect of Double Aging on Precipitation Kinetics, Microstructure and Tensile Properties of as-ECAPed Mg-8Sn-6Zn-2Al Alloy
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An icosahedral quasicrystal phase (I-phase)-containing Mg-8Sn-6Zn-2(wt.%)Al (TZA862) alloy was subjected to ECAP and subsequent double aging. Thereafter, the age-hardening microstructure and tensile properties of the as-ECAPed TZA862 alloy were investigated. The results indicated that the grain size, fraction and orientation of the precipitates as well as the texture were affected by the double-aging treatment, which contributed to the enhanced hardness and tensile strength. The hardening of the aged alloy was mainly ascribed to the nucleation of the precipitates on grain boundaries and the strengthening was mainly related to the Orowan mechanism.
This study was jointly supported by the National Natural Science Foundation of China (Grant Nos. 51404166, 51704209, 51701060), a Research Project Supported by Shanxi Scholarship Council of China (Grant No. 2014-023), and the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi (Grant No. 2014017), Shanxi Province Science Foundation for Youths (Grant No. 2016021063).
- 26.L. Tian, Int. J. Metall. Met. Phys. 2, 13 (2017).Google Scholar