Ni-Ti-Nb宽滞后形状记忆合金焊接环拉伸断裂分析  

TENSILE FRACTURE ANALYSIS OF Ni-Ti-Nb MEMORY ALLOY JOINTING RING WITH WIDE HYSTERESIS SHAPE

作　　者：胡姜文[1] 杨思乾[1] 马铁军[1] 张勇[1] 

机构地区：[1]西北工业大学材料学院,西安710072

出　　处：《理化检验（物理分册）》2008年第1期11-13,共3页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：研究了Ni-Ti-Nb宽滞后形状记忆合金点焊环拉伸试验的断裂行为。对形状记忆合金环的断口形貌及微区成分用扫描电镜作了分析,得出了形状记忆合金环中的(Ti,Nb)2Ni硬脆相是导致断裂的主要原因。并分析了(Ti,Nb)2Ni硬脆相形成的原因,提出了利用多次电弧炉熔炼和热变形工艺的方法来提高记忆合金冶金质量的建议。The fracture of Ni-Ti-Nb alloy ring with wide hystersis shape memory, is studied oy tensue test. The fracture and microstructure of ring is analysed by SEM. It is found that the hard and brittle （Ti, Nb）2Ni phase leads to fracture of the ring. The （Ti, Nb）2Ni phase formation cause is analysed. It is proposed that these methods of multiple electric arc melting and thermal deformation are used to improve the quality of the alloy.

关 键 词：形状记忆合金 断裂 热变形 宽滞后 

分 类 号：TG139.6[一般工业技术—材料科学与工程]