合金元素Ti对Mo合金性能及组织结构的影响

Effect of alloyed element Ti on property and microstructure of Mo alloy

采用粉末冶金方法制备Ti含量为0.3%～1.0%的Mo-Ti合金。通过力学性能实验、光学显微镜观测和SEM分析,对Mo-Ti合金的性能和组织结构进行研究分析。结果表明,在Mo粉中添加TiH2所制备的合金比纯钼金属具有更好的拉伸性能,并且当Ti含量为0.8%时合金的力学性能最好;合金元素Ti除部分固溶到钼基体外,还在晶粒之间和晶粒内部生成(Mo,Ti)xOy弥散相,这些(Mo,Ti)xOy弥散相的生成,一方面净化了晶界氧,使晶粒之间的孔隙减少,同时也阻止晶粒在烧结时的晶粒长大,有利于合金性能的提高;但Ti添加量过多时,会使晶界之间产生过量的(Mo,Ti)xOy质点,使晶粒之间的结合能力减弱,对合金性能产生不利影响。

Mo-Ti alloy with 0.3%-1.0%Ti was fabricated by powder metallurgy process. The property and microstructure of Mo-Ti alloy were studied and analyzed through mechanical property test, optical microscope observation and SEM analysis. The result indicates that the property of the alloy by adding TiH2 powder is better than pure Mo. The alloy has the best mechanical property when the additional amount of Ti is 0.8%. The portion of alloyed element Ti solves in the Mo matrix while the others form （Mo, Ti）xOy distributed phase. This kind of dispersion phase absorbs the oxygen in the grain boundary, decreases the number of pores between grains as well as prohibits the growth of the grain that altogether plays a positive role in the enhance of the alloy property. However, over-dose （Mo,Ti）xOy particles could weaken the binding ability of the grains, which would generate negative influence on the property of the alloy.