合金化成分对NiTi合金M_s点影响的正电子湮没研究  

EFFECT OF ALLOYING ON M_s IN NiTi ALLOY STUDIED BY POSITRON ANNIHILATION SPECTROSCOPY

作　　者：胡益丰[1] 邓文[2] 

机构地区：[1]江苏技术师范学院数理学院,常州213001 [2]广西大学物理科学与工程技术学院,南宁530004

出　　处：《低温物理学报》2010年第6期445-448,共4页Low Temperature Physical Letters

基　　金：国家自然科学基金项目(批准号:50361002);江苏省普通高校自然科学研究计划资助项目(批准号:07KJD430041)资助的课题

摘　　要：用双探头符合系统测量了金属Fe、Co、Ni、Al、Nb、Cu、Ti和NiTi合金的多普勒展宽谱,计算了其S参数和W参数,分析了合金中d-d金属键的作用.结果表明,当用Fe、Co或Al原子加入NiTi合金时,都将使合金中参与形成d-d金属键的d电子减少,从而使金属键减弱;而用Cu或Nb原子加入NiTi合金时,对合金中d-d电子作用的影响很小,合金中共价键的成分变化不大.在NiTi合金中加入合金化元素可以改变其电子结构,进而影响Ms点.Doppler-broading spectrum of positron annihilation radiation of pure metals Fe,Co,Ni,Al,Nb,Cu,Ti and NiTi alloys have been measured by using 2-detector coincidence technique.And the S and W parameters of NiTi alloys are calculated.The results indicate that the addition of Fe,Co and Al into a NiTi alloy can decrease the d electrons,thus decreasing the fraction of the metallic bonds.When Cu and Nb are added into NiTi alloys,the effect in the interaction of d-d electrons is very small,as well as the proportion of the covalent bond has no obvious variation.The alloying elements in NiTi alloys can change their electronic structures,further influence the Ms temperature.

关 键 词：NITI形状记忆合金 3d电子 正电子湮没 

分 类 号：O572.322[理学—粒子物理与原子核物理]