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(质量分数)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62.2 GPa,抗压强度为2227MPa,压缩率为29.1％.
Ti-(8～20)Mo alloys made from elemental powders were fabricated by a 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 produced in the sintering temperature range of 1400～1500 ℃.The lowest sintering temperature for densification gradually increases with the rise of Mo content.Ti-(8～16)Mo alloys exhibit typical widmanstatten structure,whereas the Ti-20Mo alloy consists of single equiaxed β grains.In the range of 8％～16％ of Mo,increasing Mo content can decrease β grains in size,and correspondingly the a lamellars become less and thinner.The as-PMed Ti-(8～20)Mo alloys show good mechanical performance,and possess lower elastic modulus of 59～68 GPa.In comparison,the Ti-14Mo alloy sintered at 1450 ℃ exhibits 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.
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