Effects of Sr addition on as cast microstructure of AS31 alloy

摘要：

The effect of Sr addition on the as-cast microstructure of AS31 alloy was studied. The experimental results show that the grain size decreased obviously from 1116μm to 221μm for AS31 alloy with addition of 0.05％Sr, and promote the formation of globular grains. The morphology of eutectic Mg2Si phase is changed from Chinese script to polyhedral shape or fine fibers shape. The grain refinement mechanism is attributed to the enrichment of Sr element at solidification interface front, which restricts the growth of α-Mg primary dendrite. The modification of the eutectic Mg2Si phases results from the dissociative Sr changing the preferred growth manner of them.

关键词： AS31 magnesium alloy Sr grain refinement modification

作者: Jixue Zhou Yuansheng Yang Shouqiu Tang Changwen Tian

作者单位: New Materials Research Institute of Shandong Academy of Sciences, China Institute of Metal Research, New Materials Research Institute of Shandong Academy of Sciences, China

会议类型: 国际会议

会议名称: 11th IUMRS International Conference in Asia(第十一届国际材联亚洲材料大会 IUMRS-ICA 2010)

会议地点: 青岛

会议语种:英文

页码: 125-128

在线出版日期: 2010-09-25（万方平台首次上网日期，不代表论文的发表时间）