Abstract
ABSTRACTIn this paper, the effects of Sr, Sb, Sr+Sb and Sn on Mg2Si reinforcement phases in an Mg–Al–Zn–Si alloy are studied, and the structures and characteristics of Mg2(SixSn1−x) phases are analysed with first-principle calculations. The results show that the coarse eutectic Mg2Si can be refined by modifying processes with Sr, Sb, and their combination. When alloying with Sn, a new reinforcement phase Mg2(SixSn1−x) forms by a substitution reaction, instead of Mg2Si. Calculations indicate that Mg2(SixSn1−x) has a certain percentage of covalent bonds, which ensure it has sufficient hardness to act as a reinforcement phase. Calculated results for physical parameters, such as the bulk modulus and shear modulus, indicate that an Mg2(SixSn1−x) intermetallic exhibits greater ductility than Mg2Si.HighlightsThe coarse eutectic Mg2Si can be refined by modifying processes.A new phase Mg2(SixSn1−x) forms by substitution reaction during solidification.Mg2(SixSn1−x) has certain covalent bound percentage.Mg2(SixSn1−x) has better plasticity than that of Mg2Si.
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