Fabrication of ultra-thin porous titanium alloys by electron beam selective melting: Porosity and mechanical properties

IF 4.2 Q2 ENGINEERING, MANUFACTURING

Additive manufacturing letters Pub Date : 2025-01-12 DOI:10.1016/j.addlet.2025.100268

Jinhu Liu , Feihong Wang , Dong Lu , Yongfeng Liang , Junpin Lin

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Abstract

Titanium alloys are widely regarded as ideal biomaterials due to their superior mechanical properties and resistance to corrosion. Additive manufacturing offers a novel approach for fabricating porous structures, enabling the production of titanium alloys with intricate geometries and varied dimensions. In this study, porous titanium alloys were produced using the Ti-6Al-2Zr-2V-1Mo alloy via electron beam selective melting (EBSM). Thin-wall structures with thicknesses ranging from 360 μm to 600 μm demonstrated exceptional mechanical performance near the forming threshold. An increase in porosity from 22 % to 32 % was observed, resulting in a reduction in tensile strength from 350 MPa to 250 MPa. Tensile testing and microstructural analyses revealed that precise control of the electron beam spot diameter facilitated effective metallurgical bonding between powder particles, with residual pores comparable in size to the original powder. This work highlights a promising strategy for fabricating titanium alloys tailored for biomedical applications.

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电子束选择性熔炼制备超薄多孔钛合金：孔隙率和力学性能

钛合金因其优异的力学性能和耐腐蚀性能而被广泛认为是理想的生物材料。增材制造为制造多孔结构提供了一种新的方法，使生产具有复杂几何形状和不同尺寸的钛合金成为可能。以Ti-6Al-2Zr-2V-1Mo合金为原料，采用电子束选择性熔炼法制备多孔钛合金。厚度为360 ~ 600 μm的薄壁结构在成形阈值附近表现出优异的力学性能。观察到孔隙率从22%增加到32%，导致抗拉强度从350mpa降低到250mpa。拉伸测试和显微组织分析表明，精确控制电子束光斑直径有助于粉末颗粒之间有效的冶金结合，残余孔隙的大小与原始粉末相当。这项工作强调了制造适合生物医学应用的钛合金的有前途的策略。

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