用非自耗真空电弧炉熔炼β钛合金Ti-8Mo-8Zr 4.5Sn-2Mn,用金相显微镜、X射线衍射仪、纳米硬度仪表征和研究了合金的组织、结构和弹性模量。结果表明：这种β钛合金的组织中枝晶组织和等轴晶组织共存;晶体结构为β相,合金元素产生了偏析;合金的弹性模量为41.4 GPa。与TMA合金（Ti-11.5Mo-6Zr-4.5Sn）对照,研究了电子浓度e/a、d电子理论参数结合次数Bo和d轨道能Md对合金弹性模量的影响。结果表明：合金d轨道能Md值减小,结合次数Bo减小,同时电子浓度适当的增加,有利于合金弹性模量的降低。
A new beta titanium alloy Ti-8Mo-8Zr-4.5Sn-2Mn was designed,and melted by non-consumable electric arc furnace in argon atmosphere.The metallographic microstructure,the crystal texture,hardness and elastic modulus were characterized by microscope,X-ray diffractometer and nano-hardness Tester.The results show that the alloy contains dendritic structure and equiaxed grain structure, exists alloying element segregation and has the elastic modulus with 41.4GPa.Meanwhile,comparing to TMA（Ti-11.5Mo-6Zr-4.5Sn）,the effects of the electron concentration e/a,the combined number Bo and the d electron orbital energy level Md on the elastic modulus were investigated.The conclusions was obtained that the low of Bo and Md and the increase of e/a are beneficial to reduce the elastic modulus of alloy.
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