双态高铌TiAl合金的蠕变行为  

Creep Behavior of a Duplex High-Nb Containing TiAl Alloy

作　　者：何素芳[1] 林均品[1] 徐向俊[1] 高建峰[1] 王艳丽[1] 宋西平[1] 陈国良[1] 

机构地区：[1]北京科技大学,北京100083

出　　处：《稀有金属材料与工程》2006年第2期257-260,共4页Rare Metal Materials and Engineering

基　　金：国家重点基础研究发展规划项目(G2000067206-2);国家自然科学基金(50274005)联合资助

摘　　要：研究了Ti-45Al-9(Nb,W,B,Y)两相合金分别在760℃和815℃时,应力值在80MPa^300MPa区间的蠕变行为。蠕变前合金的显微组织为均匀细小的双态组织。将研究结果与高铌TiAl合金全片层组织的蠕变性能进行了对比,发现所研究的双态组织合金具有相对较弱的蠕变抗力,其最小蠕变速率较全片层组织Ti46Al8.5Nb0.1C0.2B合金的要高1个数量级。蠕变应力指数表明,该合金在760℃~815℃,80MPa^300MPa的蠕变条件下,合金的蠕变受位错攀移控制。The creep behavior of a two phase Ti-45Al-9 （Nb,W,B,Y） alloy was investigated at 760℃ and 815℃, under stresses ranging from 80 MPa to 300 MPa. The initial microstructure was found to be fine duplex microstructure. The comparison of the creep properties was presented between,the duplex and the full lamellar microstructure of high-Nb containing TiAl ahoy. It can be confirmed that the duplex alloy studied exhibit lower creep resistance and a minimum creep rate higher than that of the full lamellar Ti46A18.5Nb0.1C0.2B alloy by one order of magnitude. Creep stress exponents show that at 760℃-815℃, 80 MPa-300 MPa, the creep mechanism of this alloy is dislocation climb.

关 键 词：蠕变性能 TIAL 最小蠕变速率 

分 类 号：TG111[金属学及工艺—物理冶金]