激冷Ti-46Ni合金薄带的组织、相变和形状记忆效应

Microstructure, transformation and shape memory effect of chilled Ti-46Ni alloy ribbon

摘要:

用激冷甩带法制备了Ti-46Ni合金薄带,用扫描电子显微镜、X射线衍射仪、示差扫描热分析仪和弯曲试验研究了合金薄带的组织特性、相变行为和形状记忆效应。结果表明,铸态及400~600℃退火态Ti-46Ni合金薄带的显微组织形态呈树枝状,晶粒细小,由B19ˊ马氏体和B2母相组成；冷却、加热时,该合金薄带发生一阶段马氏体相变；铸态和退火态Ti-46Ni合金薄带均具有良好的形状记忆效应。

Abstract:

The Ti-46Ni alloy ribbons were fabricated by melt-spinning. The microstructure characteristics, the transformation behaviors and shape memory effect of Ti-46Ni alloy ribbon were investigated by SEM, XRD, differential scanning calorimetry and bending test. The results show that the microstructure morphology of as-cast and 400~600℃ annealed state of Ti-46Ni alloy ribbon presents dendritic, the grain is small, and the composition phases are martensite (B19ˊ) and parent phase (B2). The one stage martensite transformation are appeared upon cooling and heating. The as-cast and annealed Ti-46Ni alloy ribbons are all of excellent shape memory effect.