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激光定向能量沉积Ti-18Zr-13Mo亚稳β生物 钛合金组织与性能研究
Study of the Microstructure and Properties of Ti-18Zr-13Mo Metastable β Biomedical Titanium Alloys by Laser Directed Energy Deposition
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- DOI:
- 作者:
- 王林增1，2，于 君1，2，林 鑫1，2，龙振宇1，2，邬良怡1，2，牛毅豪1，2
WANGLinzeng1,2,YU Jun1,2, LIN Xin1,2, LONG Zhenyu1,2, WU Liangyi1,2, NIU Yihao1,2
- 作者单位:
- 1. 西北工业大学凝固技术国家重点实验室，陕西西安710072；2.西北工业大学金属高性能增材制造与创新设计工业 和信息化部重点实验室，陕西西安710072
1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China; 2. MIIT Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design, Northwestern Polytechnical University, Xi'an 710072, China
- 关键词:
- 激光定向能量沉积；亚稳β生物钛合金；弹性模量；屈服强度
laser-directed energy deposition; metastable β biomedical titanium alloy; elasticity modulus; yield strength
- 摘要:
- 钛及钛合金因其比强度高、耐蚀性好、密度低等性能被广泛用于航空航天、机械制造、生物医疗等领域。 特 别是在生物医疗领域，钛合金相比于传统316L不锈钢、钴铬合金等，具有相对更低的弹性模量、出色的耐腐蚀性和生物 相容性，逐渐受到行业人员的关注。 本文基于混合元素法，利用激光定向能量沉积技术成功制备了Ti-18Zr-13Mo(质量 分数，%)亚稳β生物钛合金，合金由全β相构成，沉积态弹性模量为73.5GPa，屈服强度为842.2MPa，伸长率为20%， 性能全面优于临床应用广泛的Ti6Al4V。通过固溶处理，合金弹性模量进一步降低至69.5GPa。Ti-18Zr-13Mo合金相比 于Ti6Al4V 合金可以有效减少植入物“应力屏蔽”现象的发生，同时能够提供足够的强度支撑，是一款适用于骨骼植入 物的新型亚稳β生物钛合金。Titanium and titanium alloys are widely used in aerospace, machinery manufacturing, biomedical and other fields because of their excellent properties, such as high specific strength, good corrosion resistance and low density. Compared with traditional 316L stainless steel and cobalt-chromium alloys, titanium alloys have relatively lower elastic moduli, excellent corrosion resistance and biocompatibility, gradually attracting the attention of industry personnel. In this work, a Ti-18Zr-13Mo (wt. %) metastable β-Ti alloy was successfully fabricated via laser directed energy deposition based on the mixed element method. The alloy is composed of β phase, with an elastic modulus of 73.5 GPa, a yield strength of 842.2 MPa, and an elongation rate of 20% in the deposition state. The elastic modulus of the alloy can be further reduced to 69.5 GPa by solution treatment. Compared with Ti6Al4V alloys, Ti-18Zr-13Mo alloys can effectively reduce the occurrence of the “stress shielding” phenomenon of implants and can provide sufficient strength support. Therefore, the Ti-18Zr-13Mo alloy is a suitable metastable β biomedical titanium alloy material for bone implants.