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采用冷等静压+真空烧结(CIP)法制备了不同Mo含量的Ti-6Al-4V-2Cr合金,并对其进行了组织和力学性能分析。结果发现,不同Mo含量下钛合金的致密度基本都达到98%,且当Mo含量为1.5%时,更为致密;当Mo含量低于1.5%时,合金的组织为等轴晶组织,且随Mo含量增加,晶粒变小;当Mo含量高于1.5%时,组织为网状组织;合金的强度、硬度(HV)和伸长率在Mo含量为1.5%时达到最大值,分别为1 054.7 MPa、332.7、6.1%;经过物相分析,钛合金的主要相组成为α相和β相,但在透射电镜下观察发现,当Mn含量为3.0%时,Ti-6Al-4V-2Cr合金显微组织中出现硬脆的TiCr_2相,会降低合金的力学性能。
Ti-6Al-4V-2Cr alloy with different Mo content was prepared by cold isostatic pressing and vacuum sintering (CIP) method. The microstructure and mechanical properties of Ti-6Al-4V- The results show that the densities of titanium alloys are almost 98% at different Mo contents and are denser when the Mo content is 1.5%. When the Mo content is less than 1.5%, the microstructure of the alloy is equiaxed and When the content of Mo is higher than 1.5%, the microstructure is reticular structure. The strength, hardness (HV) and elongation of the alloy reach the maximum when the Mo content is 1.5% 054.7 MPa, 332.7 and 6.1% respectively. After phase analysis, the main phase composition of the titanium alloy is α phase and β phase. However, under the transmission electron microscope, the Ti-6Al-4V-2Cr alloy The appearance of hard and brittle TiCr_2 phase in the microstructure will reduce the mechanical properties of the alloy.