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首页> 美国卫生研究院文献>Scientific Reports >Isotropic plasticity of β-type Ti-29Nb-13Ta-4.6Zr alloy single crystals for the development of single crystalline β-Ti implants
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Isotropic plasticity of β-type Ti-29Nb-13Ta-4.6Zr alloy single crystals for the development of single crystalline β-Ti implants

机译：β型Ti-29Nb-13Ta-4.6Zr合金单晶的各向同性可塑性可用于单晶β-Ti植入物的开发

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β-type Ti-29Nb-13Ta-4.6Zr alloy is a promising novel material for biomedical applications. We have proposed a ‘single crystalline β-Ti implant’ as new hard tissue replacements for suppressing the stress shielding by achieving a drastic reduction in the Young’s modulus. To develop this, the orientation dependence of the plastic deformation behavior of the Ti-29Nb-13Ta-4.6Zr single crystal was first clarified. Dislocation slip with a Burgers vector parallel to <111> was the predominant deformation mode in the wide loading orientation. The orientation dependence of the yield stress due to <111> dislocations was small, in contrast to other β-Ti alloys. In addition, {332} twin was found to be operative at the loading orientation around [001]. The asymmetric features of the {332} twin formation depending on the loading orientation could be roughly anticipated by their Schmid factors. However, the critical resolved shear stress for the {332} twins appeared to show orientation dependence. The simultaneous operation of <111> slip and {332} twin were found to be the origin of the good mechanical properties with excellent strength and ductility. It was clarified that the Ti-29Nb-13Ta-4.6Zr alloy single crystal shows the “plastically almost-isotropic and elastically highly-anisotropic” nature, that is desirable for the development of ‘single crystalline β-Ti implant’.
机译：β型Ti-29Nb-13Ta-4.6Zr合金是一种有前途的新型生物医学材料。我们提出了一种“单晶β-Ti植入物”作为新的硬组织替代物，以通过显着降低杨氏模量来抑制应力屏蔽。为了发展这一点，首先弄清了Ti-29Nb-13Ta-4.6Zr单晶的塑性变形行为的取向依赖性。 Burgers向量平行于<111>的位错滑移是宽载荷方向上的主要变形模式。与其他β-Ti合金相比，由<111>位错引起的屈服应力的取向依赖性小。另外，发现{332}孪晶在[001]附近的加载方向上起作用。 {332}孪晶结构的不对称特征取决于加载方向，可以通过其施密特因子大致预测。然而，{332}孪晶的临界解析剪切应力似乎表现出取向依赖性。发现<111>滑模和{332}孪晶的同时操作是具有优良强度和延展性的良好机械性能的起源。已明确表明，Ti-29Nb-13Ta-4.6Zr合金单晶具有“塑性几乎各向同性和弹性高度各向异性”的性质，这对于开发“单晶β-Ti植入物”是理想的。

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