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借助d电子理论计算,设计并制备了具有较高Kβ稳定参数的生物相容性β型Ti-26Nb-28Ta-5.5Zr(%(质量分数),Kβ～1.61)合金。综合利用万能电子试验机测试、显微硬度测试、X射线衍射分析和透射电子显微学观察等方法,研究了该合金固溶态时的压缩性能、变形机制以及不同变形量对应的显微结构特征。结果表明:固溶态β型Ti-26Nb-28Ta-5.5Zr合金具有较好的塑性,其屈服强度约为450 MPa。当变形量为7%时,其形变机制为位错滑移;当形变量为50%时,严重影响变形结构特征的塑性变形机制主要为应力诱发α″马氏体相变;而当形变量为75%时,除了α″马氏体相变、还观察到明显的非均匀局域化变形。
With the help of d-electron theory, a biocompatible β-type Ti-26Nb-28Ta-5.5Zr alloy (K (mass fraction), Kβ ~ 1.61) with high Kβ stability parameter was designed and prepared. In this paper, the compressive properties, deformation mechanism and the microstructure of the alloy with different deformations are studied by means of universal testing machine, microhardness test, X-ray diffraction analysis and transmission electron microscopy. feature. The results show that the solid solution of β-type Ti-26Nb-28Ta-5.5Zr alloy has better plasticity and the yield strength is about 450 MPa. When the amount of deformation is 7%, the deformation mechanism is dislocation slip. When the amount of deformation is 50%, the plastic deformation mechanism that seriously affects the deformation structure is mainly stress-induced martensite transformation. When the amount of deformation Is 75%, in addition to the α "martensitic transformation, significant non-uniform localized deformation is also observed.