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采用粉末冶金方法制备Mo-Zr合金,研究Zr对Mo-Zr合金烧结致密化行为及其组织与性能的影响。结果表明,合金烧结后接近全致密,固相Mo颗粒间的固相烧结是导致合金致密化的主要原因;合金室温抗拉强度相对于纯Mo显著提高,且随Zr含量增加合金强度持续上升;提高压制压力使合金致密度改善,但对合金性能影响并不显著,而提高烧结温度对合金性能产生不利影响,1920℃烧结的合金具有最佳性能。少部分Zr原子固溶进入Mo基体中产生显著固溶强化作用,大部分Zr则吸附坯体中的氧元素形成氧化物二次相粒子弥散分布于晶界和晶粒内部,净化晶界氧的同时,使合金晶粒得以显著细化。
Mo-Zr alloy was prepared by powder metallurgy and the effect of Zr on the densification behavior, microstructure and properties of Mo-Zr alloy was studied. The results show that the solid state sintering of the solid Mo particles is the main reason for the densification of the alloy after sintering. The tensile strength at room temperature of the alloy is significantly higher than that of the pure Mo, and the strength of the alloy increases with the increase of Zr content. Increasing the pressing pressure to improve the alloy density, but the impact on the alloy performance is not significant, and to improve the sintering temperature has an adverse effect on the performance of the alloy, the alloy sintered at 1920 ℃ has the best performance. A small part of Zr atoms solid solution into the Mo matrix to produce significant solid solution strengthening effect, most of the Zr is adsorbed to the body of the oxide element secondary oxide particles dispersed in the grain boundaries and grain boundaries, the grain boundary clean oxygen At the same time, the alloy grains can be significantly refined.