【摘要】 以开发综合力学性能良好的高弹性模量钛合金为研究目的，采用冷坩埚悬浮熔炼法制备了Ti-6Al-4Mo-x Mn(x=0,1,2,3,4，质量分数,%)合金，研究了Mn含量对合金显微组织和力学性能的影响。结果表明，Ti-6Al-4Mo-x Mn合金由α和β相组成，未出现Ti-Mn相。随着Mn含量的增加，合金的α→β相变温度降低，合金中β相的体积分数增加，合金的组织变细，魏氏组织逐渐增多；合金的硬度（HRC）从30增加到46，抗拉强度从838 MPa增加到1266 MPa，这是因为Mn元素在合金中引起了固溶强化和组织细化；合金的弹性模量呈现先升高后降低的趋势，当Mn含量为1%时，合金的弹性模量最高，约136 GPa，同时抗拉强度为916 MPa，较Ti-6Al-4V合金分别提高24.0%和3%，综合力学性能最好。更多还原

【Abstract】 In order to develop titanium alloy with high elastic modulus and good comprehensive mechanical properties, Ti-6Al-4Mo-x Mn(x=0, 1, 2, 3, 4, wt%) alloys were prepared by a cold crucible suspension melting method. The effect of Mn content on the microstructure and mechanical properties of the alloy was systematically investigated. The results demonstrate that the prepared Ti-6Al-4Mo-x Mn alloys are composed of α and β phases without Ti-Mn phase. With the increase of Mn content, the α→β phase transition temperature decreases,resulting in an increase in volume fraction of β phase. Moreover, the microstructure of the alloys gradually becomes finer and evolves toward Widmannstatten microstructure. The hardness of the alloy increases from 30 HRC to 46 HRC, and the tensile strength increases from 838 MPa to 1266 MPa, which is attributed to the solution strengthening and microstructure refinement caused by Mn atoms. With the increase of Mn content, the elastic modulus of the alloy increases first and then decreases. When the Mn content is 1wt%, the elastic modulus of the alloy is the highest, which is 136 GPa, and the tensile strength is 916 MPa, which are 24.0% and 3% higher than those of Ti-6Al-4V alloy, respectively.更多还原