摘要
对砂型和金属型铸造AZ91D试样进行了铸态下与固溶处理后金相腐蚀研究,对压铸AZ91D试样进行铸态金相腐蚀和EBSD试验研究。结果表明,铸态砂型和金属型试样树枝晶形状显示六重对称性特征,一次枝晶间夹角为60°,固溶处理后晶粒尺寸变大。压铸试样冷却速度快,枝晶不能充分生长,难以显示六重对称性特征,EBSD试验能够准确测量压铸试样的晶粒尺寸和晶粒取向。
The metallographic etch for as-cast and solid solution treated samples of AZ91D magnesium alloy in sand casting and permanent mould casting has been performed,and as-cast microstructure and ESBD experiment of die casting AZ91D magnesium alloy have been investigated.The results show that the dendrites in as-cast microstructures of sand casting and permanent mold samples are characterized by sixtuple-symmetrical features,in which the angle between the primary dendrites is 60°,and the grain size can coarsen after solid solution.The absence of sixtuple-symmetrical features can be observed as a result of high cooling rate restraining the full growth of dendrites in die casting samples.EBSD experiment can accurately measure the grain size and grain orientation in die casting samples.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2007年第7期496-498,共3页
Special Casting & Nonferrous Alloys
基金
国家重点基础研究发展计划(973计划)资助项目(2006CB605208)
清华-东洋镁合金成形技术研究开发中心研究项目
