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,2019,48(9):2965~2971.[heyongdong,zhouxinfeng,helei,douyinli,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.]
石油焦制备Al-Ti-C-Ce母合金显微组织及凝固机理研究
投稿时间:2018-04-24  修订日期:2018-04-28
中文关键词:  Al-Ti-C-Ce  显微组织  复合粒子  凝固机理
基金项目: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
中文摘要:
      采用X射线衍射(XRD)、扫描电子显微镜(SEM)、能谱仪(EDS)研究了Al-Ti-C-Ce母合金显微组织。结果表明:该母合金由α(Al)、(AlTi)、(TiC)、(Ti2Al20Ce)相组成;合金中分布具有复合结构的第二相。线分析表明:合金中C分布均匀,粒子内部Al含量偏低,粒子与基体间界面区域Ce含量最高,粒子内部铈含量略低,第二相粒子内部是元素Ti含量分布最集中的区域。母合金的凝固过程为:合金熔体中Ti、Al、C首先形成高熔点TiC、(TiAl)质点相;以TiC相为一次晶核,(TiAl)相偏聚在TiC相表面,形成TiC-(TiAl)复合晶核,Al通过包晶反应形成微细TiC-(TiAl)-α(Al)一级复合晶核;以某一能量较高、团簇尺寸较大的一级复合晶核为核心,其它一级复合晶核偏聚在其表面,形成二级复合晶核。二级复合晶核形成三级复合晶核,依次类推,形成复合粒子的钛富集区。钛富集区作为超级“晶核”,并作为Ti2Al20Ce和(Al4Ce)形核的“基底”,在其表面形成富铈的壳层,α(Al)通过富铈的壳层成核。
The Microstructure and Solidification Mechanism of Al-Ti-C-Ce Prepared by Petroleum Coke
英文关键词:Al-Ti-C-Ce  Microstructure  Composite particle  Solidification mechanism
英文摘要:
      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.
作者单位E-mail
贺永东 新疆大学 hydongq@126.com 
周新锋 新疆大学 zhouxinfeng1993@163.com 
何蕾 新疆大学  
豆银丽 新疆大学  
张庆媛 新疆大学  
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