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采用粉末冶金方法制备Mo-Ti-Zr-TiC合金,研究微量TiC的添加对Mo-Ti-Zr-TiC合金的拉伸性能和显微组织的影响。结果表明,在Mo-Ti-Zr合金中添加微量TiC(0.1%～0.5%,质量分数)后,合金的相对密度和室温抗拉强度得到了提高,当TiC添加量为0.4%时,合金强度最高,较Mo-Ti-Zr合金提高了28.1%。微量TiC的添加,阻碍了合金烧结过程中的晶粒长大,合金晶粒尺寸随TiC添加量的增加而降低。添加的细小TiC粒子在高温烧结过程中或与坯体中的微量氧发生反应形成了由Mo、Ti、C及O4种元素组成的(Mo,Ti)xOyCz细小复合第二相粒子,或发生团聚结成大颗粒,对合金起到净化晶界氧和弥散强化的作用,因而合金的性能相比Mo-Ti-Zr合金有了较明显的提高。
Mo-Ti-Zr-TiC alloy was prepared by powder metallurgy method to study the effect of TiC addition on the tensile properties and microstructure of Mo-Ti-Zr-TiC alloy. The results show that the relative density and room temperature tensile strength of TiC (0.1% ~ 0.5%, mass fraction) are increased when TiC is added into Mo-Ti-Zr alloy. When TiC content is 0.4%, the alloy strength The highest, compared with Mo-Ti-Zr alloy increased by 28.1%. Addition of trace TiC hindered the grain growth during the sintering process and the grain size decreased with the increase of TiC addition. The added small TiC particles react with the trace oxygen in the green body during sintering at high temperature to form (Mo, Ti) xOyCz fine composite second phase particles composed of Mo, Ti, C and O4 elements, or agglomeration occurs Forming large particles, the alloy plays the role of purifying the grain boundary oxygen and dispersion strengthening, so the performance of the alloy compared to the Mo-Ti-Zr alloy has been significantly improved.