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以Ti-47.5Al-2.5V-1.0Cr合金粉末为原料,采用放电等离子烧结工艺制备出TiAl基合金,并研究了制备工艺、显微组织与室温力学性能三者的关系.结果表明,采用放电等离子烧结方法可制备出致密度高、组织均匀的TiAl基合金.烧结温度对合金的显微组织影响显著,且其室温力学性能与显微组织密切相关,显微组织越细小,室温强度和塑性越高.当烧结温度为1100℃时,制备出的TiAl-V-Cr合金显微组织类型为细小双态组织,具有35.2%的压缩率和3321MPa的断裂强度,显示出较好的室温压缩性能.
TiAl-based alloy was prepared by spark plasma sintering with Ti-47.5Al-2.5V-1.0Cr alloy powder as raw material, and the relationship between preparation technology, microstructure and mechanical properties at room temperature was studied. The plasma sintering method can prepare TiAl-based alloy with high density and uniform microstructure.The sintering temperature has a significant effect on the microstructure of the alloy, and the room-temperature mechanical properties are closely related to the microstructure, the finer the microstructure, the room temperature strength and plasticity The higher the TiAl-V-Cr alloy microstructure, the smaller the bimodal microstructure, with the compressibility of 35.2% and the rupture strength of 3321MPa, showing good compressibility at room temperature .