Microstructures and Creep Behavior of a Directionally Solidified NiAl-Fe(Nb) Multiphase Intermetallic Alloy  

作　　者：Yihui QI, Jianting GUO and Chuanyong GUIDepartment of Superalloys, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China 

出　　处：《Journal of Materials Science & Technology》2003年第1期59-62,共4页材料科学技术（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China (No.59895152) ; National Advanced Materials Committee of China (No.863-715-005-0030), to whom we are very grateful.

摘　　要：The microstructure and creep behavior of a DS NiAI-Fe(Nb) multiphase intermetallic alloy have been investigated. This alloyexhibits dendritic structure, in which dendritic arm is β-(Ni,Fe)(Fe,Al) phase surrounded by interdendritic region of γ'/γ phase.The results of the creep test indicated that all of the creep curves have similar characteristic, which is a short primary creepstage and a dominant steady state creep stage, and the creep strain ranges from 18% to 52%. The apparent stress exponentand the apparent activation energy were analyzed and discussed. The mechanism of the creep deformation was also analyzedby the observation of TEM.The microstructure and creep behavior of a DS NiAI-Fe(Nb) multiphase intermetallic alloy have been investigated. This alloyexhibits dendritic structure, in which dendritic arm is β-(Ni,Fe)(Fe,Al) phase surrounded by interdendritic region of γ'/γ phase.The results of the creep test indicated that all of the creep curves have similar characteristic, which is a short primary creepstage and a dominant steady state creep stage, and the creep strain ranges from 18% to 52%. The apparent stress exponentand the apparent activation energy were analyzed and discussed. The mechanism of the creep deformation was also analyzedby the observation of TEM.

关 键 词：NIAL Multiphase intermetallic alloy Microstructure Creep 

分 类 号：TG146[一般工业技术—材料科学与工程]