摘要
利用光学显微镜 (OM)和TEM ,研究了全层状TiAl合金的层片间距的影响因素及与各因素的关系。实验结果表明 ,全层状TiAl合金的层片间距与冷却速度和合金中铝含量有关 ,层片间距与冷却速度呈反比关系 ,并随着合金中铝含量的增加而增加。同时 ,以层片生长的台阶机制为基础 ,推导出了全层状TiAl合金在连续冷却过程中层片间距的数学表达式 。
It is important to control the lamellar spacing of fully la mellar TiAl alloy for improving its mechanical properties. The factors affecting the lamellar spacing of fully lamellar TiAl alloy and the dependence of the lam ellar spacing on the factors were investigated by means of OM and TEM. The resul ts show that the lamellar spacing depends on cooling rate and Al content. The la mellar spacing is inversely proportional to cooling rate and increases with the increase of Al content. At the same time, a theoretical expression of the lamell ar spacing of fully lamellar TiAl alloy during continuous cooling has been deriv ed on the basis of the ledge mechanism of lamellae growth. The theoretical resul ts are in agreement with the experimental findings.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2003年第1期153-156,共4页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金重大资助项目 (5 9895 15 0 )
国家 863计划资助项目 (715 0 0 5 0 0 40 )
