Ti-45Ni-5Cu-0.3Cr与Ti-45Ni-5Cu形状记忆合金的相变和形变行为对比  

Comparison of phase transformation and deformation behaviors of Ti-45Ni-5Cu-0.3Cr and Ti-45Ni-5Cu shape memory alloys

作　　者：贺志荣[1] 张伟[1] 张坤刚 杜雨青 HE Zhi-rong;ZHANG Wei;ZHANG Kun-gang;DU Yu-qing(School of Materials Science and Engineering,Shaanxi University of Technology,Hanzhong 723001,China)

机构地区：[1]陕西理工大学材料科学与工程学院,陕西汉中723001

出　　处：《材料热处理学报》2023年第9期61-68,共8页Transactions of Materials and Heat Treatment

基　　金：国家重点研发计划(2016YFE0111400);汉中市春光建材公司项目(H20220201)。

摘　　要：为了开发相变热滞窄、形状记忆性能良好的Ti-Ni基多元形状记忆合金,采用示差扫描量热仪和拉伸试验对比研究了退火态Ti-45Ni-5Cu和Ti-45Ni-5Cu-0.3Cr形状记忆合金的相变行为、拉伸性能和形状记忆行为。结果表明:350~700℃退火态Ti-45Ni-5Cu和Ti-45Ni-5Cu-0.3Cr合金冷却、加热时的相变类型相同,皆为B2■ΔB19′(B2-母相,CsCl型结构;B19′-马氏体,单斜结构);室温下,两种合金的拉伸曲线特征类似,皆呈现形状记忆效应(SME);随变形温度升高,两种合金均发生SME→SE(超弹性)转变。与Ti-45Ni-5Cu合金相比,Ti-45Ni-5Cu-0.3Cr合金的马氏体相变温度较低,相变热滞较窄,抗拉强度较低,伸长率较高,形状记忆平台应力较高,SME→SE转变温度较低。350~700℃退火态Ti-45Ni-5Cu-0.3Cr合金在60℃变形时SE较优。650℃退火态Ti-45Ni-5Cu-0.3Cr合金的塑性最好,伸长率达67.6%。In order to develop Ti-Ni based multicomponent shape memory alloys with narrow temperature hysteresis and good shape memory properties,the phase transformation behavior,tensile properties and shape memory behavior of annealed Ti-45Ni-5Cu and Ti-45Ni-5Cu-0.3Cr shape memory alloys were compared and studied by differential scanning calorimeter and tensile test.The results show that the Ti-45Ni-5Cu and Ti-45Ni-5Cu-0.3Cr alloys annealed at 350-700℃have the same transformation type during cooling and heating,both of which are B2■B19′(B2-parent phase,CsCl-type structure;B19′-martensite,monoclinic structure).At room temperature,the tensile curves of the two alloys are similar,showing shape memory effect(SME).With the increase of deformation temperature,SME→SE(superelasticity)transition occurs in both alloys.Compared with the Ti-45Ni-5Cu alloy,the Ti-45Ni-5Cu-0.3Cr alloy has lower martensite transformation temperature,narrower temperature hysteresis,lower tensile strength,higher elongation,higher shape memory platform stress,and lower SME→SE transformation temperature.The Ti-45Ni-5Cu-0.3Cr alloy annealed at 350-700℃exhibits better SE when deformed at 60℃.The plasticity of the Ti-45Ni-5Cu-0.3Cr alloy annealed at 650℃is the best,with an elongation of 67.6%.

关 键 词：Ti-Ni-Cu-Cr合金 Ti-Ni-Cu合金 形状记忆合金 相变 形变 

分 类 号：TG139.6[一般工业技术—材料科学与工程]