高能球磨时间和退火温度对制备TiNi合金粉的影响

为获得高能球磨时间和退火温度对TiNi机械合金粉特性的影响机制,采用X射线衍射(XRD)、扫描电子显微镜(SEM)、X射线能谱仪(EDS)、差示扫描量热法(DSC)等分析方法对TiNi合金粉进行了研究。结果表明,机械合金的相成分随着在氩气保护气氛中的球磨时间和退火温度的不同而发生变化。球磨22h的产物是非晶态TiNi合金、Ti的固溶体、Ni的固溶体,球磨27h的产物是非晶态TiNi合金粉和Ni固溶体相,球磨30h发生了明显的固相反应,生成了TiNi、Ni3Ti、Ti3Ni4等物相;在650℃/5h和1000℃/5h下的退火产物都是Ni3Ti、Ti2Ni、TiNi2、TiNi和TiC,但在上述2个退火温度下TiNi并不是主要物相,其中在650℃退火时TiNi的含量明显更低。

Effect of high energy ball milling time and annealing temperature on the preparation of TiNi alloy powder

In order to obtain the influence mechanism of high energy ball milling time and annealing temperature on the characteristics of TiNi mechanically alloyed powder ( MA powder ) , the MA powder was analyzed by X?ray diffraction ( XRD ) , scanning electron microscope ( SEM ) , energy dispersive spectrdmeter ( EDS) and differential scanning calorimetry( DSC) . The experimental results show that phase transition in the MA powder was observed with various milling times in an atmosphere of Ar gas and various annealing temperatures. The MA powders consist of the amorphous state TiNi alloy, solid solution of Ti and solid solution of Ni after ball milling 22 h, the amorphous state TiNi alloy and solid solution of Ni after ball milling for 27 h, and TiNi, Ni3 Ti and Ti3 Ni4 phases after ball milling for 30 h due to the obvious solid state reaction. After annealed at 650 ℃ for 5 h and at 1 000 ℃ for 5 h respectively, the MA powders consist of Ni3 Ti, Ti2 Ni, TiNi2 , TiNi and TiC, in which TiNi was not the main phase and the content of TiNi annealed at 650 ℃ was significantly lower than that of annealed at 1 000 ℃.