Nb含量对铸态Ni-Ti-Nb合金微观组织和马氏体相变的影响  

Effects of Nb Content on Microstructure and Martensitic Phase Transformation of As-cast Ni-Ti-Nb Alloy

作　　者：孟玉堂[1] 张永皞[1] 孙明艳[1] 范啓超 黄姝珂[1] 魏齐龙[1] MENG Yutang;ZHANG Yonghao;SUN Mingyan;FAN Qichao;HUANG Shuke;WEI Qilong(Institute of Machinery Manufacturing Technology,China Academy of Engineering Physics,Mianyang 621900,China)

机构地区：[1]中国工程物理研究院机械制造工艺研究所

出　　处：《热加工工艺》2018年第22期38-41,共4页Hot Working Technology

基　　金：中国工程物理研究院科学技术发展基金项目(2015B0302060);四川省科技厅应用基础项目(2017JY0319)

摘　　要：固定Ni含量,设计并制备了不同Nb含量的Ni-Ti-Nb合金,并采用差示扫描量热仪(DSC)、光学显微镜(OM)和扫描电镜(SEM)等方法对试样的热诱发马氏体相变行为和微观组织进行了研究。结果表明,随着Nb含量的增加,微观组织中共晶相的数量增加,热诱发马氏体相变峰由窄变宽直至无明显的热效应,相变温度也向低温方向移动。As-cast Ni-Ti-Nb shape memory alloys with fixed Ni content and different Nb contents were designed and prepared.Differential scanning calorimetry (DSC),optical microscope (OM)and scanning electronic microscope (SEM)were used to research the thermal induced martensitic phase transformation and microstructure.The results indicate that with the increase of Nb addition,the numbers of eutectic phase in the microstructure increase.The peak of the thermal induced martensile phase transformation turns from narrowness to broadness,until it has unobvious heat effect,and the pha.se transformation temperatures shift to low temperature direction.

关 键 词：Ni-Ti-Nb 形状记忆合金 铸态 热诱发马氏体相变 

分 类 号：TG113[金属学及工艺—物理冶金] TG139.6[金属学及工艺—金属学]