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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。
The Ti Ni alloy powder prepared by high-energy ball milling with an atomic ratio of 1: 1 was subjected to plasma vacuum sintering. The composition and microstructure of the alloy powders and sintered samples were characterized by XRD, EDS and SEM. At the same time, the hardness of sintered samples was tested. The results show that the Ti Ni powder is amorphous after ball milling for 22 h, and the TiNi alloy powders have a solid phase reaction after milling for 30 h, resulting in the formation of TiNi, Ni_3Ti, Ti_3Ni_4 and other phases. The plasma-sintered phases are Ti Ni, Ni_4Ti_3, Ni_3Ti and Ti_2Ni. The average grain size was about 2μm and the average hardness (HV) was 9000 MPa. After 1 year of natural aging, the average hardness reached 6800MPa, which was 2 ~ 5 times higher than that of Ti Ni alloy prepared by conventional arc melting method.