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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