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对TiH2-47Al-0.2Si-10Nb和TiH2-47Al-0.2Si-12Nb成分的粉末机械合金化过程进行了研究,并将球磨30 h后的粉末进行放电等离子和真空烧结。借助X射线衍射仪、扫描电子显微镜和透射电子显微镜研究机械合金化对TiAl基合金烧结组织的影响。结果表明,高能机械球磨过程中形成了非晶相及TiAl金属间化合物,球磨30 h后粉末颗粒达到10 nm左右。采用放电等离子和真空烧结均获得了细小、均匀的TiAl和Ti3Al相组织,烧结组织晶粒在1μm左右。
The mechanical alloying process of TiH2-47Al-0.2Si-10Nb and TiH2-47Al-0.2Si-12Nb powders was studied. The powders after ball milling for 30 h were subjected to discharge plasma and vacuum sintering. The effects of mechanical alloying on the sintered microstructure of TiAl-based alloys were investigated by means of X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The results show that the amorphous phase and TiAl intermetallic compounds are formed during high energy mechanical milling, and the powder particles reach about 10 nm after ball milling for 30 h. Small and uniform TiAl and Ti3Al phase structures were obtained by using both discharge plasma and vacuum sintering. The sintered crystal grains were about 1μm.