钇对Ti-43Al-9V合金组织性能的影响  

Effect of Yttrium on Microstructure and Mechanical Properties of Ti-43Al-9V Alloy

作　　者：孔凡涛[1] 陈玉勇[1] 田竞[1] 陈子勇[1] 韩杰才[1] 

机构地区：[1]哈尔滨工业大学材料科学与工程学院,黑龙江哈尔滨150001

出　　处：《稀有金属》2004年第1期75-77,共3页Chinese Journal of Rare Metals

基　　金：国家自然科学基金资助项目 ( 5 0 2 740 3 5 )

摘　　要：采用OM ,XRD ,SEM和TEM等测试方法 ,分析了稀土元素 (Y)对Ti 43A1 9V合金显微组织以及力学形能的影响。实验结果表明 ,Ti 43Al 9V 0 .3Y合金由γ相、α2 相、B2 相和YAl2 相组成 ;添加稀土可以细化Ti 43Al 9V合金的晶粒尺寸 ,并促进细小的α2 /γ层片形成以及细化粗大的α2 /γ/B2 层片。对TiAl合金力学性能测试表明 ,适量添加稀土Y( 0 .3 %,原子分数 )可明显改善合金的室温强度和塑性 ,但过量添加将会造成材料性能降低 ;断口分析表明过量添加稀土导致沿晶断裂比例增加将损害TiAl合金的性能。The influences of rare earth metal (Y) on microstructure and mechanical properties of Ti 43A1 9V were studied alloy by OM, XRD, SEM and TEM measurements. The results show that Ti 43Al 9V 0 3Y alloy is composed of γ phase, α 2 phase, B 2 phase and YAl 2 phase. Adding Y can refine the grain size and thick α 2/γ/B 2 lamellar thickness of Ti 43Al 9V alloy, and promote the formation of fine α 2/γ lamellar. Mechanical property tests show that comparing with Y free alloys, proper quantities for Y (0.3%(atomic fraction)) added can apparently enhance RT strength and plastic property of Ti 43Al 9V alloy, but excessive adding Y will damage the mechanical property of Ti 43Al 9V alloy. Fracture analysis indicates that excessive adding Y resulting in the increasing of intercrystalline fracture ratio is the reason of decreasing mechanical property of TiAl alloys.

关 键 词：TIAL合金 显微组织 力学性能 稀土 

分 类 号：TG146.2[一般工业技术—材料科学与工程]