粉末冶金Ti-Mo合金的显微组织及力学性能

Microstructure and mechanical properties of PM Ti–Mo alloys

摘要:

以元素粉末为原料,采用模压烧结技术制备了Ti-(8~20)Mo合金,并探讨了烧结工艺及Mo含量对合金组织和力学性能的影响规律。结果表明,在1400℃~1500℃范围内可制备出高致密且组织成分均匀的Ti-Mo合金材料。合金烧结致密化所需最低温度随Mo含量升高相应提高。当Mo含量为8~16%,合金为典型魏氏体组织,Mo含量提高可使合金中β相晶粒尺寸减小,α片层含量降低并逐渐细化；而Ti-20Mo合金则由单一等轴β相晶粒组成。模压烧结Ti-Mo合金力学性能优异,其弹性模量范围为59~68 GPa；在1450℃烧结制备的Ti-14Mo合金相对具有最佳的综合性能,其硬度为35.7HRC,弹性模量为62.2GPa,抗压强度为2227MPa,压缩率为29.1%。

Abstract:

_{: Ti-(8~20)Mo alloys from elemental powders were fabricated by powder metallurgy technique. The effects of sintering temperature and Mo content on the microstructure and mechanical properties were studied. The results show that the Ti-Mo alloys with high-density and uniform microstructure can be produce atsintering temperature range of 1400℃~1500℃. The lowest densification sinteringStemperatureSgradually increase with the rise of Mo content. Ti-(8~16)Mo alloys shows typical widmanstatten structure, whereas the Ti-20Mo alloy consists of single β grains. TheIn the range of 8%~16%,increasing Mo content can result in the decrease of β grains, and corespondingly the α lamellars become less and thinner.The as-PMed Ti-(8~20)Mo alloys obtained show good mechanical performence, and possess lower elastic modulus of 59~68 GPa.In comparison, the Ti-14Mo alloy sintered at 1450℃exhibits the superior mechanical properties with hardness of 35.7HRC, compressive strength of 2227 MPa, compression rate of 29.1%, and elastic modulus of 62.2 GPa.}