铌对Ti_3Al价电子结构及其脆性的影响  

Effect of Nb on Valence Electron Structures and Embrittlement of Ti 3Al

作　　者：朴英锡[1] 李文[1] 

机构地区：[1]长春大学机械学院,长春130022

出　　处：《稀有金属》2000年第1期47-51,共5页Chinese Journal of Rare Metals

基　　金：吉林省科技计划资助

摘　　要：应用固体与分子经验电子理论计算了Ｔｉ３Ａｌ 及加入铌后各相的价电子结构， 并从均匀变形因子α、解理能Ｇｃ 及位错行为等方面分析了铌对Ｔｉ３Ａｌ 脆性的影响。铌使Ｔｉ３Ａｌ 合金的α及Ｇｃ 提高； 同时铌也减弱了ＴｉＴｉ 共价键， 增加了基面滑移， 从而导致Ｔｉ３Ａｌ 脆性有本质改善。Abstract: According to the EET, the valence electron structures of various phases in Ti Al Nb alloys were calculated. Effect of Nb on embrittlement of Ti 3Al was analysed in view of average deforming factor α , cleavage energy G cand dislocation movement. Analysis showed that Nb makes α 2 partly disordered, novel phases toughened and α and G c bigger. Also Nb makes Ti Ti bond weakened and dislocation slip increased in basis plane. Finally, these reasons result in naturaly toughening effect of Nb on Ti 3Al.

关 键 词：TI3AL 价电子结构 脆性 铌 

分 类 号：TG146.2[一般工业技术—材料科学与工程] TG111.1[金属学及工艺—金属材料]