等离子体烧结制备TiNi合金的表征  

Characterization of TiNi Alloy Prepared by Spark Plasma Sintering

作　　者：马维刚[1] 起华荣[1] 冯中学[1] 王效琪[1] 史庆南[1] 杨钢[2] 陈亮维[1] 

机构地区：[1]昆明理工大学,云南昆明650093 [2]昆明冶金研究院,云南昆明650031

出　　处：《稀有金属材料与工程》2016年第7期1793-1797,共5页Rare Metal Materials and Engineering

基　　金：教育部博士基金点(KKQS201351008)

摘　　要：将高能球磨制备的原子比为1：1的Ti Ni合金粉进行等离子体真空烧结。利用XRD、EDS和SEM对合金粉和烧结样进行了成分与微观形貌的表征,同时对烧结样进行了硬度测试。结果表明：球磨22 h后Ti Ni粉呈非晶态粉末,球磨30 h后的TiNi合金粉发生了明显的固相反应,生成了TiNi、Ni_3Ti、Ti_3Ni_4等物相。等离子体烧结样的物相是Ti Ni,Ni_4Ti_3、Ni_3Ti和Ti_2Ni。平均晶粒尺寸约2μm,平均硬度（HV）达到9000 MPa,自然时效1年后的平均硬度达到6800MPa,是常规电弧熔炼法制备的Ti Ni合金的2-5倍。Ti Ni alloy powder of atomic ratio 1：1 was prepared by high energy ball milling process,and then sintered by plasma in vacuum.The composition and microstructure of the Ti Ni alloy powder and Ti Ni sintered sample were characterize by XRD,EDS and SEM,and the hardness of the sintered sample was also tested.The results show that the Ti Ni powder is amorphous after 22 h high energy ball milling,the solid state reactions obviously take place and the new phases,such as Ti Ni and Ti3Ni4,appear after 30 h high energy ball milling.Phases of the sintered sample are Ti Ni,Ni4Ti3,Ni3 Ti and Ti2 Ni,its average grain size is about 2 μm,and its average Vickers hardness（HV） is up to 9000 MPa.After one year natural aging,its average Vickers hardness is down to 6800 MPa,which is 2-5 times higher than that of Ti Ni alloy prepared by the arc melting method.

关 键 词：机械合金化 TI-NI合金 等离子体烧结(SPS) 

分 类 号：TF125.22[冶金工程—粉末冶金]