硼对高铌TiAl基合金γ→α相变的影响  

The effect of B on the phase transformation of γ→α of TiAl alloy rich Niobium

作　　者：胡义华[1] 谌炎辉[2] 张树林[1] 

机构地区：[1]广西工学院鹿山学院,柳州545616 [2]广西工学院机械工程系,柳州545006

出　　处：《机械设计与制造》2012年第2期202-203,共2页Machinery Design & Manufacture

基　　金：广西科技开发项目(桂科能08126002,桂科能0992028-14)

摘　　要：TiAl广泛应用在在航空航天和汽车等领域,研究了硼对高铌TiAl基合金γ→α相变的影响。研究发现:在相同的保温时间下,Ti-46Al-8Nb-0.8B合金α2相的体积分数比Ti-46Al-8Nb合金小,这主要是因为Ti-46Al-8Nb-0.8B合金中的α相从γ晶界析出的形核率低,生长更困难而导致的;微量元素硼的添加能显著促进片状α相从γ晶粒内析出的形核率,抑制块状α相从γ晶界析出的形核率,并能阻碍α相的生长。TiAl is widely used in the fields of aerospace and automotive.The effect of B on the phase transformation of γ→α of TiAl alloy with rich Niobium was investigated.The results show that the volume fraction of phase α2 in Ti-46Al-8Nb-0.8B alloy is lower than that of Ti-46Al-8Nb alloy under same soaking time condition,which reason is due to lower nucleation rate of phase α from γ grain boundary and harder growth.Also,the addition of micro element B greatly promotes nucleation rate of schistose phase α precipitated from γ grain,which suppresses the nucleation rate of precipitation of bulk α from γ grain boundary,and impedes growth of phase.

关 键 词：TIAI合金 硼 相变 

分 类 号：TH16[机械工程—机械制造及自动化] TG146.2[一般工业技术—材料科学与工程]