Abstract
Mg-8Sn-1Al-1Zn-xNi (x=0.5%, 1.0%, 1.5%, 2.0%, mass fraction) alloys were designed and prepared. The microstructures and the mechanical properties were studied by using optical microscope, scanning electronic microscope, energy dispersive X-ray spectroscope, X-ray diffraction and a standard universal testing machine. The results show that the microstructure of Ni-containing alloys consist of α-Mg, Mg2Sn, β-Mg-Ni-Al and γ-AlNi phases. No β-Mg-Ni-Al phase was observed in TAZ811-2.0Ni alloy due to its 1:1 atomic ratio of Ni/Al. The addition of Ni refines the α-Mg dendrites and suppresses the formation of coarse Mg2Sn phase. The tensile properties results show that the TAZ811-0.5Ni alloy presented the best mechanical properties, which is due to the rod-like β-Mg-Ni-Al phase, refined α-Mg dendrites and Mg2Sn phase, as well as γ-AlNi phase. The tensile fracture mechanism transits from cleavage to quasi-cleavage fracture with the increasing Ni addition.
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Foundation item: Project supported by the Shanxi Selective Funds for Returned Scholars, China; Project(2013021013-4) supported by the Shanxi Province Science Foundation for Youths China; Projects(2012L053, 2012L003) supported by the Taiyuan University of Technology Funds for Young Scientists, China; Project(2014021017-2) supported by the Natural Science Foundation for Young Scientists for Shanxi Province, China
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Que, Zp., Ma, T., Wang, J. et al. Microstructure and mechanical properties of as-cast Mg-8Sn-1Al-1Zn-xNi alloys. J. Cent. South Univ. 21, 3426–3433 (2014). https://doi.org/10.1007/s11771-014-2318-4
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DOI: https://doi.org/10.1007/s11771-014-2318-4