摘要
测定了不同温度下TiAl基合金表面渗碳的动力学曲线,分析了表面渗碳层的结构和组成,研究了TiAl基合金的渗碳机理.结果表明,CO对具有不同扩散速率的Ti和Al进行的选择反应,导致渗碳层的多层结构;TiAl基合金的表面渗碳过程分为两个阶段:渗碳初期和渗碳稳定期.在渗碳初期遵守近似的抛物线增重规律,在渗碳稳定期遵守近似的直线增重规律;在渗碳稳定期,TiAl基合金的表面渗碳反应为零级反应,动力学行为遵守严格的线性变化规则;速率常数与温度的关系较好地遵守Arrhenius公式.
Mechanism of TiAl based alloy surface carburization was investigated based on the determination of the kinetics curves of TiAl based alloy surface carburization at different temperatures and the analysis of the microstructure and composition of the surface carburization layer. The results showed that choice reaction between carbon monoxide and Ti, Al elements was the prime mechanism for the formation of the carburization multi-layer structure. The surface carburization reaction of TiAl based alloy is zero order reaction, and the kinetics behavior of carburization obeys the rule of lineal change strictly. Variations of rate constant with carburization temperature agree with the Arrhenius formula.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2005年第2期139-146,共8页
Chinese Journal of Materials Research
基金
八六三计划高技术基金2002AA305209高校博士点基金20020533019资助项目~~
关键词
金属材料
TIAL基合金
表面渗碳
动力学
活化能
渗碳机理
Activation energy
Aluminum alloys
Composition
Microstructure
Reaction kinetics
Surface chemistry
Surfaces
Temperature
Titanium alloys
