The thermal expansion properties of Mg-xSi (x=1 wt.%, 1.38 wt.%, 2 wt.%, 3 wt.%, and 4 wt.%) binary alloys and Mg-4Si-yCa (y=0.2 wt.%, 0.4 wt.%, 0.6 wt.%, 0.8 wt.%, and 1.0 wt.%) alloys over a temperature range of 25-300^oC were systematically studied. The results show that the Mg-Si binary alloys consist of alpha-Mg and Mg₂Si phases. The volume fraction of Mg₂Si phase increases with the increase of Si content in Mg-Si alloys, from 30.72% to 46.50% when Si content increases from 1 wt.% Si to 4 wt.% Si. The coefficient of thermal expansion (CTE) of Mg-xSi binary alloys decreases with the increase of Mg₂Si volume fraction. The addition of Ca element to Mg-4Si alloys has an obvious modification effect on the Mg₂Si phase. When the Ca content increases constantly, the CTE of the Mg-4Si-Ca alloys increases at first, then it continues to decline. The mechanism is mainly related14ks to the formation of the CaMgSi phase. Keywords: Mg-Si alloy, Mg₂Si phase, modification, thermal expansion.

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