Grain refinement mechanism of Mg-3Sn-1Mn-1La alloy during accumulative hot rolling

We elucidate the effect of lanthanum (La) on the grain refinement of Mg-3Sn-1Mn alloy during accumulative hot rolling. The lath-shaped Mg2Sn phase in the Mg-3Sn-1Mn alloy is firstly broken and spheroidized, and then the size increases and coarsens with the increase of rolling reduction, most of Mg2Sn move from grain boundary to grain and are homogeneously distributed within the matrix. However, the plate-shaped MgSnLa compound in Mg-3Sn-1Mn-1La...