Ti_(53)Ni_(47)形状记忆合金的相变行为及其在模拟体液中的耐蚀性研究  

Research on Phase Transition Behavior of Ti_(53)Ni_(47) Shape Memory Alloy and Its Corrosion Resistance in Simulated Body Fluids

作　　者：罗松 羊思洁 郑丽 LUO Song;YANG Sijie;ZHENG Li(School of Materials Science and Engineering,Sichuan University of Science and Technology,Zigong 643000,China)

机构地区：[1]四川轻化工大学材料科学与工程学院,四川自贡643000

出　　处：《热加工工艺》2024年第10期93-96,共4页Hot Working Technology

基　　金：钒钛资源综合利用四川省重点实验室项目(2018FTSZ08);四川理工学院人才引进项目(2017RCL17)。

摘　　要：对Ti_(53)Ni_(47)形状记忆合金进行不同温度的退火处理。采用差示扫描量热法(DSC)对其相变点进行测定,研究其相变行为。采用光学显微镜(OM)观察显微组织,利用X射线衍射仪(XRD)进行物相分析,采用Hank's溶液模拟人体体液环境,测试极化曲线,探讨热处理温度对显微组织及耐蚀性的影响。结果表明:不退火或经低温退火后,合金在-30~200℃冷却或加热时不发生相变。经高温退火,合金在20~200℃将发生相变,退火温度升高,转变容易。未退火和经300℃退火的合金室温相为B2相,而经400、500℃退火的合金室温相为B2和B19';合金内部存在黑色点状组织,其原子分数近似为Ti51Ni49。经退火处理,合金在模拟人体体液环境中的耐蚀性得到提升,但并非线性变化,呈一定的波动性。Ti_(53)Ni_(47)shape memory alloy was annealed at different temperatures.Differential scanning calorimetry(DSC)was used to determine the phase transition point and study its phase transition behavior.Optical microscope(OM)was used to observe the microstructure.X ray diffractometer(XRD)was used for phase analysis.Hank's solution was used to simulate the humoral environment of human body curve was tested.The effects of heat treatment temperature on the microstructure and corrosion resistance were discussed.The results show that no phase transition occurs when the alloy is cooled or heated at-30-200℃.The alloy undergoes phase transition at 20-200℃.After high temperature annealing.The annealing temperature increases and the transition is easy.The room temperature phase of unannealed and 300℃annealed alloys is B2 phase,while the room temperature phase of the alloy annealed at 400℃and 500℃is B2 and B19'.There are black dots inside the alloy,its atomic fraction is approximately Ti51Ni49.After annealing,the corrosion resistance of the alloy in simulated body fluid environment is improved,but the nonlinear changes,showing a certain volatility.

关 键 词：形状记忆合金 热处理 相变点 微观组织 

分 类 号：TG156.2[金属学及工艺—热处理] TG146.23[金属学及工艺—金属学]