粉末冶金Ti-Mo合金的显微组织及力学性能  

Microstructure and Mechanical Properties of Ti-Mo Alloys by Powder Metallurgy Process

作　　者：林迎午 路新[1] 孙博[1] 刘程程[1] 曲选辉[1] 

机构地区：[1]北京科技大学新材料技术研究院,北京100083

出　　处：《稀有金属材料与工程》2017年第5期1387-1392,共6页Rare Metal Materials and Engineering

基　　金：新金属材料国家重点实验室开放基金(2012Z-10);国家自然科学基金(51204015)

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(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2227 MPa,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.

关 键 词：钛钼合金 粉末冶金 弹性模量 显微组织 

分 类 号：TF125.22[冶金工程—粉末冶金]