La掺杂对Ni_(50)Ti_(50)形状记忆合金力学性能的影响  

The influence of La doping on mechanical properties of Ni_(50)Ti_(50) shape memory alloys

作　　者：李维雅 赵春旺[2] LI Wei-ya;ZHAO Cun-wang(College of Sciences,Inner Mongolia University of Technology,Hohhot 010051,China;College of Arts and Science,Shanghai Maritime University,Shanghai 201306,China)

机构地区：[1]内蒙古工业大学理学院,呼和浩特010051 [2]上海海事大学文理学院,上海201306

出　　处：《内蒙古工业大学学报（自然科学版）》2021年第3期199-204,共6页Journal of Inner Mongolia University of Technology：Natural Science Edition

基　　金：国家自然科学基金项目(51261017);内蒙古自治区高等学校科学研究项目(NJZY20080);内蒙古工业大学科学研究项目(BS201931,X201223)。

摘　　要：元素掺杂是影响合金性能的有效方法.通过稀土元素La掺杂,近等原子比NiTi合金的微结构发生变化,进而影响其力学性能.用实验的方法研究了用少量La元素替代Ti元素形成的Ni_(50)Ti_(50-x)La_(x)(x=0.1,0.3,0.5,0.7)三元合金的力学性能.结果表明:Ni_(50)Ti_(50-x)La_(x)合金的硬度、弹性模量、屈服强度和断后伸长率随La元素掺杂量的增加而减小,拉伸强度先增大后减小,在La元素掺杂量为0.3at%时达到最大值.断口形貌分析表明:合金断裂主要为解理断裂,随着La元素掺杂量的增加,合金的塑性降低.Element doping is an effective method to modify the properties of alloys.Through the doping of rare earth element La,the microstructure of the equiatomic NiTi alloy changes,which in turn affects its mechanical properties.The mechanical properties of tri-element alloys of Ni_(50)Ti_(50-x)La_(x)(x=0.1,0.3,0.5,0.7)formed by replacing Ti with a small amount of La element were studied experimentally.The results show that the hardness,elastic modulus,yield strength and elongation at break of the Ni_(50)Ti_(50-x)La_(x) alloy decrease with the increase of La element doping.The tensile strength first increases and then decreases,reaching the maximum value when La content is 0.3 at.%.Fracture morphology analysis shows that the alloy fracture is mainly cleavage fracture.With the increase of La element doping,the plasticity of the alloy decreases.

关 键 词：形状记忆合金 Ni-Ti-La合金 力学性能 沉淀相 

分 类 号：O348.3[理学—固体力学]