The Effects of Al-Ca Compounds on Grain Refinement of Mg-Ca Alloys
In the present work, Al-Ca metallic compound was prepared in Mg-Ca alloys and the effects of Al-Ca metallic compound and different Al/Ca values on the grain refinement of Mg-Ca alloys were investigated by scanning electron microscopy and X-ray diffraction, and the mechanism of grain refinement of Mg-Ca alloys was discussed. The results showed that the grain size of Mg-0.5Ca alloy was obviously reduced from 550μm to 230μm due to the addition of Al. Al2Ca phase existed in these alloys and its morphology evolved from granular to rod-like. It is regarded as the main factor for the grain refinement.
Yafang Han, Fusheng Pan, Jianmao Tang, Chungen Zhou
S. T. Xiong et al., "The Effects of Al-Ca Compounds on Grain Refinement of Mg-Ca Alloys", Materials Science Forum, Vol. 686, pp. 348-354, 2011