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贺永东,周新锋,何蕾,豆银丽,张庆媛.石油焦制备Al-Ti-C-Ce母合金显微组织及凝固机理研究[J].稀有金属材料与工程(英文),2019,48(9):2965~2971.[heyongdong,zhouxinfeng,helei,douyinli and zhangqingyuan.The Microstructure and Solidification Mechanism of Al-Ti-C-Ce Prepared by Petroleum Coke[J].Rare Metal Materials and Engineering,2019,48(9):2965~2971.]
The Microstructure and Solidification Mechanism of Al-Ti-C-Ce Prepared by Petroleum Coke
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Received:April 24, 2018??Revised:April 28, 2018
Key words:?Al-Ti-C-Ce??Microstructure??Composite particle??Solidification mechanism
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目),国家科技攻关计划
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heyongdong,zhouxinfeng,helei,douyinli and zhangqingyuan??
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??????The microstructure of an Al-Ti-C-Ce alloy was studied by XRD,SEM,and EDS. This mother alloy consisted of α(Al),(AlTi),(TiC),and (Ti2Al20Ce) phases,and there was a second phase of a composite structure in the alloy.The TiC phase was the primary crystal nucleus,and the (TiAl) phase was segregated on the surface of TiC phase to form a TiC-(TiAl) composite crystal nucleus. Al formed a fine TiC-(TiAl)-α(Al) primary composite crystal nucleus by a peritectic reaction.The primary composite crystal nucleus with higher energy and larger cluster size was taken as the core,and other composite crystal nuclei were segregated on its surface to form a secondary composite crystal nucleus.Next,the secondary composite crystal nucleus formed the tertiary composite crystal nucleus,and so on,to form the titanium-enriched area of composite particles.