定向凝固Al-10wt.%Mg 合金中孪生枝晶生长

In this paperBecause of the distinctive morphology compared with conventional dendrites, feathery grain has been studied for a very long time. It has been found that the nucleation process of feathery grain obtained in directionally solidified Al-10wt.%Mg alloys is complex, the initial growth direction is disorder. Feathery grain grows rapidly and eliminates conventional dendrites gradually with increasing the time. Once the growth speed decreases, the spacing of dendrite primary and secondary arms get coarsened rapidly with increasing the solidification time. Additionally, the EBSD analysis shows that feathery grains obtained in Al-10wt.%Mg alloy by directionally solidifying are composed of twined dendrits, and the twinning relation and crystal orientation remain unchanged.