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镁合金半固态差异化演变方式与行为机理
Differential Evolution Patterns and Behavior Mechanisms of Semi-solid Magnesium Alloys
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- DOI:
- 作者:
- 王瑞权 邱葭菲 程勤华 陈云祥 黄海军
WANG Ruiquan;QIU Jiafei;CHENG Qinhua;CHEN Yunxiang;HUANG Haijun
- 作者单位:
- 浙江机电职业技术学院材料技术系 上海交通大学材料科学与工程学院
Department of Materials Technology, Zhejiang Institute of Mechanical and Electrical Engineering, Hangzhou 310053, China;School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai 200030, China
- 关键词:
- AM60B合金 晶粒细化 铸态微观组织 半固态微观结构
AM60B alloy grain refinement as-cast microstructure semisolid microstructure
- 摘要:
- 研究了经MgCO3细化处理后的AM60B镁合金在610℃半固态等温热处理过程中的微观组织演化。结果表明,镁合金原始组织晶粒大小不同,其半固态演变方式有很大差异;粗大晶粒演化过程包括最初的树枝晶、枝晶合并、溶质扩散、晶粒块状化和最后的球化五个阶段;对于细小晶粒,一颗原始细小等轴晶一般最终形成一个初生α晶粒。The microstructural evolution of AM60B magnesium alloy refined by MgCO3 during 610 ℃ semi-solid isothermal heat treatment was studied. The results show that the semi-solid evolution mode of magnesium alloys varies greatly with the grain size of the original microstructure. The evolution of coarse grains includes five stages: the initial dendrites, dendrite consolidation, solute diffusion, grain bulk formation and spheroidization. For fine grains, a primitive fine equiaxed grain generally eventually forms a primary alpha grain.