张复懿,刘慧敏,刘丽

• 1:内蒙古工业大学材料科学与工程学院
• 2:内蒙古新材料工程技术中心

摘要(Abstract)：

采用原位反应近液相线铸造法制备4.4%TiCp/7075Al基复合材料,在600℃保温10～60 min,水淬固定其半固态组织,研究半固态二次加热过程中合金的晶粒长大规律,并与采用同样方法制备的7075基体合金进行对比分析。结果表明,4.4%TiCp/7075Al基复合材料的晶粒粗化速率常数为118.96μm3/s,远小于7075基体合金的晶粒粗化速率常数311.7μm3/s,晶粒长大速率明显减慢。分析其原因,由于原位TiC颗粒的生成,使得4.4%TiCp/7075Al基复合材料的晶粒长大激活能增加约50%,从而对二次加热过程中晶粒迅速长大的行为起到了显著的抑制作用。

关键词(KeyWords)： TiCp/7075 Al基复合材料;原位反应近液相线铸造;半固态;二次加热;晶粒长大

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目(50661003)

作者(Author): 张复懿,刘慧敏,刘丽

DOI: 10.13289/j.issn.1009-6264.2010.06.001

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