樊勇军,周晓龙,贺志荣,曹建春,曹宇,陈敬超

• 1:昆明理工大学材料科学与工程学院
• 2:陕西理工学院

摘要(Abstract)：

用示差扫描热分析仪、光学显微镜和拉伸试验研究了不同退火温度(Ta)对Ti-50.8Ni-0.1Zr合金相变行为、显微组织和拉伸行为的影响。结果表明:Ta=400℃时,合金冷却/加热时的相变类型为A→R→M/M→R→A两阶段可逆相变,而Ta=500℃时,冷却/加热合金正逆转变为A→R→M/M→A,在M逆转变过程中没有出现R相。在Ta为600℃和700℃时,合金冷却/加热时发生A→M/M→A一阶段可逆转变。退火时,合金发生回复、再结晶和晶粒长大3个过程。Ta=350～450℃时,为回复阶段,合金组织为纤维状。Ta=500～600℃时,为再结晶阶段,合金组织由纤维状变为无畸变的等轴晶。Ta=650～700℃时,为晶粒长大过程,显微组织为不均匀的粗大等轴晶。随着Ta的升高,合金抗拉强度在减小,马氏体相变临界应力先增大后减小,Ta较高时伸长率显著增大,600℃以后随着晶粒尺寸增大,伸长率有所下降。

关键词(KeyWords)： Ti-50.8Ni-0.1Zr合金;形状记忆合金;退火温度;相变行为;显微组织;拉伸性能

Abstract:

Keywords:

基金项目(Foundation): 金川预研基金(金川201102)

作者(Author): 樊勇军,周晓龙,贺志荣,曹建春,曹宇,陈敬超

DOI: 10.13289/j.issn.1009-6264.2013.s1.009

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