Characterization of the structural features of Ti-6Al-4V hollow-strut lattices fabricated by laser powder bed fusion

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Materials Characterization Pub Date : 2024-09-17 DOI:10.1016/j.matchar.2024.114364

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Abstract

Hollow-strut metal lattices are novel cellular materials. Compared to their solid-strut counterparts, their powder bed fusion additive manufacturing (PBF-AM) features remain largely uninvestigated. This work focuses on characterizing the hollow-strut internal channel and nodal profiles, the defects and microstructures of the hollow-strut thin walls, and the inner surface conditions of the LPBF-manufactured body-centred cubic (BCC) Ti-6Al-4V hollow-strut lattices with different relative densities. BCC lattices are selected because of the low inclination angle (35.26°) of their constituent struts. These low-inclination hollow struts are designed using a recent model developed for PBF of inclined solid struts, together with considerations to prevent powder occlusion and ensure easy removal of powder particles. Detailed characterization indicates that our design considerations resulted in high-quality hollow-strut BCC Ti-6Al-4V lattices, which provide useful design insights for PBF-AM of hollow-strut metal lattices. In terms of microstructure, the Ti-6Al-4V hollow-strut thin walls (≤ 0.5 mm thick) exhibited different microstructures compared with Ti-6Al-4V solid struts, due to the heat accumulation effect in the inner channels. The implications are discussed for in-situ microstructure control.

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激光粉末床熔融技术制造的 Ti-6Al-4V 空心支柱晶格结构特征的表征

空心支柱金属晶格是一种新型蜂窝材料。与实心支柱相比，它们的粉末床熔融增材制造（PBF-AM）特性在很大程度上仍未得到研究。这项工作的重点是表征空心支柱内部通道和节点轮廓、空心支柱薄壁的缺陷和微结构，以及 LPBF 制造的不同相对密度的体心立方（BCC）Ti-6Al-4V 空心支柱晶格的内表面状况。之所以选择 BCC 晶格，是因为其组成支柱的倾角较低（35.26°）。这些低倾角空心支柱是利用最近为倾斜实心支柱的 PBF 而开发的模型设计的，同时还考虑了防止粉末堵塞和确保粉末颗粒易于清除的因素。详细表征结果表明，我们的设计考虑因素产生了高质量的空心支柱 BCC Ti-6Al-4V 晶格，为空心支柱金属晶格的 PBF-AM 提供了有用的设计见解。在微观结构方面，与 Ti-6Al-4V 实心支柱相比，Ti-6Al-4V 空心支柱薄壁（厚度 ≤ 0.5 毫米）表现出不同的微观结构，这是由于内通道的热累积效应造成的。讨论了这对原位微结构控制的影响。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.