Maity T, Balcı Ö, Gammer C, Ivanov E, Eckert J, Prashanth K G
National Institute of Foundry and Forge Technology, Hatia, Ranchi, 834003, India; Department of Materials Science, Montanuniversitat Leoben, Jahnstraße 12, A-8700, Leoben, Austria; Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstraße 12, A-8700, Leoben, Austria.
Department of Chemistry, Koç University, Rumelifeneri Yolu, 34450, Sarıyer, İstanbul, Turkey.
J Mech Behav Biomed Mater. 2020 Aug;108:103839. doi: 10.1016/j.jmbbm.2020.103839. Epub 2020 May 4.
An exceptional combination of low Young's modulus (E ~68 GPa) and high flow strength (σ ~1 GPa) was achieved for a consolidated β-Ti-based metastable Ti-35Nb-7Zr-5Ta (TNZT) alloy subjected to room temperature high-pressure torsion (HPT). The mechanical properties of the alloy were studied by quasistatic nanoindentation tests at different strain rates, where a reduction in Young's modulus E ~73 GPa (N) and E ~68 GPa (N) is observed together with an increase in plastic deformability (or HPT rotations). The microstructure evolution with increasing shear strain has been investigated. The stabilized bcc β-Ti phase with homogeneous nanostructure distribution was observed leading to a low Young's modulus. Severe straining causes a uniform hardness distribution without any noticeable change in the strength of the material. This study may be useful for developing excellent removable implant materials.
通过对经室温高压扭转（HPT）处理的β-Ti基亚稳Ti-35Nb-7Zr-5Ta（TNZT）合金进行固结，实现了低杨氏模量（E68GPa）和高流变强度（σ1GPa）的特殊组合。通过在不同应变速率下的准静态纳米压痕试验研究了该合金的力学性能，其中观察到杨氏模量E从73GPa（N）和E68GPa（N）降低，同时塑性变形能力（或HPT旋转）增加。研究了随着剪切应变增加的微观结构演变。观察到具有均匀纳米结构分布的稳定体心立方β-Ti相，导致低杨氏模量。剧烈的应变导致硬度分布均匀，材料强度没有任何明显变化。该研究可能有助于开发优异的可摘植入材料。
