| TiAl基合金的表面渗碳行为及其机理 |
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| 引用本文： | 江垚,贺跃辉,汤义武,李智,黄伯云. TiAl基合金的表面渗碳行为及其机理[J]. 材料研究学报, 2005, 19(2): 139-146 |
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| 作者姓名： | 江垚 贺跃辉 汤义武 李智 黄伯云 |
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| 作者单位： | 中南大学粉末冶金国家重点实验室 |
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| 基金项目： | 国家高技术研究发展计划(863计划) , 高等学校博士学科点专项科研项目 |
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| 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.
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| 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 合金 表面渗碳 力学行为 渗碳机理 carburization surface TiAl based alloy mechanism 公式 Arrhenius 关系 速率常数 变化规则 线性 零级反应 直线 规律 增重 抛物线 近似 |
| 文章编号： | 1005-3003(2005)02-0139-08 |
| 修稿时间： | 2004-05-31 |
Behavior and mechanism of TiAl based alloy surface carburization |
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| JIANG Yao,HE Yuehui,TANG Yiwu,LI Zhi,HUANG Boyun. Behavior and mechanism of TiAl based alloy surface carburization[J]. Chinese Journal of Materials Research, 2005, 19(2): 139-146 |
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| Authors: | JIANG Yao HE Yuehui TANG Yiwu LI Zhi HUANG Boyun |
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| Abstract: | 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. |
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| Keywords: | TiAl based alloy surface carburization kinetics activation energy carburization mechanism |
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