Investigation of the process-dependent microstructure and mechanical properties of E-PBF processed Ti-27Nb-6Ta with low Young’s modulus based on pre-alloyed powders

基于预合金粉末的低杨氏模量 E-PBF 加工 Ti-27Nb-6Ta 的工艺相关微观结构和机械性能研究

• 批准号: 515937481
• 负责人: Professor Dr.-Ing. Thomas Niendorf
• 金额: --
• 依托单位: Fachgebiet Metallische Werkstoffe
• 依托单位国家: 德国
• 项目类别: Research Grants (Transfer Project)
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/515937481?language=en
• 关键词: Investigation; process; dependent; microstructure; mechanical

The use of structural implants in the human body becomes necessary in the event of loss or restoration of lost skeletal functionality that can occur due to tumors, deformities, fractures, infections and osteolysis. Most of the implant materials used are pure metals or metallic alloys. Titanium and its alloys, in particular Ti-6Al-4V, are used most frequently. Implants made of forged or additively manufactured Ti-6Al-4V are characterized by very good strength and good biocompatibility, the latter being promoted by a native oxidation layer on the metal surface. Due to its good osseointegration, Ti-6Al-4V is currently used for application in craniofacial, orthodontic and orthopedic implants. However, recent results indicate that aluminum and vanadium can be the cause of peripheral neuropathy, osteomalacia, and Alzheimer's disease. The elastic properties of Ti-6Al-4V also have a very disadvantageous effect. Ti-6Al-4V has a Young’ modulus of 110 GPa, thus, being 4 to 7 times stiffer than a human bone. This can ultimately cause the “stress shielding” effect. Additive manufacturing allows a comparatively inexpensive realization of individual implants specially adapted to the patient. In addition, structural details can be introduced that enable the implant to be designed in accordance with the actual load. This project comprises additive manufacturing of structures made of Ti-27Nb-6Ta by means of electron beam melting (PBF-EB/M), as well as the characterization of process, microstructure and geometry-dependent mechanical parameters taking into account the powder used for production (evaluation of the quality of the powder in three defined conditions). The Ti-Nb-Ta alloy envisaged for the investigations generally has sufficiently high strength values as well as a Young’s modulus being reduced by approx. 45% as compared with Ti-6Al-4V. Even if preliminary findings are available for samples manufactured by means of laser melting, no statements regarding additive manufacturing strategies being characterized by highest resource efficiency can be made. Questions about the influences of powder condition on the component properties upon PBF-EB/M will close prevailing knowledge gaps. The special process conditions for PBF-EB/M, i.e. the high process temperatures and processing in a vacuum, are of highest interest here.

在因肿瘤、畸形、骨折、感染和骨溶解而导致的骨骼功能丧失或恢复的情况下，在人体内使用结构性植入物变得必要。使用的植入材料大多是纯金属或金属合金。钛及其合金，特别是钛-6Al-4V是使用最频繁的。由锻造或添加制造的Ti-6Al-4V制成的植入物具有非常好的强度和良好的生物相容性，后者是由金属表面的自然氧化层促进的。钛-6Al-4V因其良好的骨性结合，目前被应用于颅面、正畸和骨科种植体。然而，最近的结果表明，铝和钒可能是周围神经病、骨软化症和阿尔茨海默病的原因。Ti-6Al-4V的弹性性能也有非常不利的影响。Ti-6Al-4V的杨氏模数为110 GPA，比人骨的硬度高4到7倍。这最终会导致“应力屏蔽”效应。添加剂制造允许以相对廉价的方式实现专门适合患者的单个植入物。此外，还可以引入结构细节，使植入物能够根据实际载荷进行设计。该项目包括通过电子束熔化(PBF-EB/M)的方法对Ti-27Nb-6Ta结构进行添加制造，以及考虑到用于生产的粉末(在三个确定的条件下评估粉末的质量)的工艺、微观结构和依赖于几何形状的机械参数的表征。研究中设想的Ti-Nb-Ta合金通常具有足够高的强力值以及杨氏模数大约降低。与Ti-6Al-4V相比提高了45%。即使通过激光熔化方法制造的样品有了初步的发现，也不能就以资源效率最高为特征的添加剂制造策略发表任何声明。关于粉末条件对PBF-EB/M组分性能的影响的问题将填补普遍存在的知识空白。PBF-EB/M的特殊工艺条件，即较高的工艺温度和在真空中加工，是这里最感兴趣的。