Refinement effect of cerium, calcium and strontium in AZ91 magnesium alloy
Refinement effect of cerium, calcium and strontium in AZ91 magnesium alloy
复制标题
DOI：
10.1016/j.jmatprotec.2008.09.020
复制
发表时间：
2009-04
影响因子：
6.3
通讯作者：
Shengfa Liu;Bo Li;Xiaokai Wang;W. Su;Huihui Han
中科院分区：
文献类型：
--
作者：
Shengfa Liu;Bo Li;Xiaokai Wang;W. Su;Huihui Han
研究了添加Ce(Ce)、Ca(Ca)和Sr(Sr)对AZ91镁合金的细化效果。结果表明，添加0.8wt.%Ce+0.2wt.%Ca或0.2wt.%Sr均有明显的细化效果，且Ce-Ca组合的细化程度高于Ce-Sr。认为Ce、Ca、Sr在晶界的偏析阻碍了凝固过程中的晶粒长大，是导致晶粒细化的主要原因。
Refinement effects of cerium (Ce), calcium (Ca) and strontium (Sr) additions to AZ91 magnesium alloy have been investigated. Results show that an addition of 0.8wt.%Ce combined with either 0.2wt.%Ca or 0.2wt.%Sr has a significant refining effect, and a higher degree of refinement using Ce–Ca combination rather than Ce–Sr. EDS microanalysis and water-quenched microstructure observation were used to reveal the grain refinement mechanism. It is assumed that grain refinement is mainly due to the impeding effect on grain growth during solidification of Ce, Ca and Sr segregation on grain boundaries.