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Controlling the microstructure and mechanical properties of a metastable β titanium alloy by selective laser melting

机译：通过选择性激光熔化控制亚稳β钛合金的组织和力学性能

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摘要

Customized titanium alloy devices have become the most attractive orthopaedic implants owing to their effects in mitigating the pain and suffering of patients. This work demonstrates the feasible control of the microstructure, i.e., defects, element diffusion, and phase transformation, and the mechanical properties of a biocompatible Ti-37Nb-6Sn alloy obtained by selective laser melting (SLM). Defects such as voids and unmelted Nb particles, as well grains with random orientation or columnar grains with {100} fiber texture in the as-fabricated Ti-37Nb-6Sn alloy can be modulated by varying the solidification rate and aging effects during the deposition process. A high energy density input promotes the diffusion of Sn from the grain boundaries to the beta-matrix, resulting in an increase in the lattice constants of the beta-matrix, with low elastic modulus of the as-fabricated Ti-37Nb-6Sn alloy. However, reheating effects promotes the formation of nanoscale alpha-phase precipitates both at the grain boundaries and in the matrix. The combined effects of rapid solidification and aging induced by reheating result in a metastable beta-type Ti-37Nb-6Sn alloy with a Young's modulus of 66 GPa, ultimate strength of 891 MPa, and elongation of 27.5%. This method can aid the design of customized titanium devices with low elastic modulus for orthopaedic implants applications.
机译：定制的钛合金装置由于其在减轻患者的疼痛和痛苦中的作用而已成为最有吸引力的骨科植入物。这项工作证明了对通过选择性激光熔化（SLM）获得的生物相容性Ti-37Nb-6Sn合金的微观结构（即缺陷，元素扩散和相变）以及机械性能的可行控制。可以通过改变沉积过程中的凝固速率和时效效应来调节缺陷，例如空隙和未熔化的Nb颗粒，以及随机制造的Ti-37Nb-6Sn合金中具有随机取向的晶粒或具有{100}纤维织构的柱状晶粒。 。高能量密度输入促进了Sn从晶界扩散到β-基体，导致β-基体的晶格常数增加，并且所制造的Ti-37Nb-6Sn合金的弹性模量低。然而，再加热效应促进了在晶界和基体中纳米级α相沉淀的形成。再加热引起的快速凝固和时效的综合作用导致了亚稳的β型Ti-37Nb-6Sn合金，其杨氏模量为66 GPa，极限强度为891 MPa，伸长率为27.5％。此方法可以帮助设计定制的具有低弹性模量的钛器械，以用于骨科植入物。

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