Surface and Interface Analysis published by John Wiley & Sons Ltd Electron beam melting is an additive manufacturing technology in vacuum that suits Ti-6Al-4V parts, which has a high affinity with oxygen. Since the high cost of the feedstock powder, the un-melted powder is often recycled in the subsequent process. In this study, the influence of powder reuse on the surface characteristics of Ti-6Al-4V powder is examined using a variety of technology including scanning electron microscopy, X-ray photoelectron spectroscopy, and Auger electron spectroscopy. The modification of surface morphology and chemistry either generally or locally are revealed and discussed, which helps the creation of powder recycling strategy. Compared with fresh virgin powder, “worn” and rougher powder particles are observed after recycling. Meanwhile, the average oxide thickness is slightly increased, and less Al enrichment was found at the surface. Locally varied chemistry/oxide thickness on different powder particles or different location on the same particle is observed.

中文翻译：

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EBM工艺回收过程中Ti-6Al-4V粉末的表面改性

John Wiley & Sons Ltd 发布的表面和界面分析电子束熔化是一种真空增材制造技术，适用于 Ti-6Al-4V 部件，该部件与氧气具有高亲和力。由于原料粉末的成本较高，未熔化的粉末往往在后续工艺中被回收利用。在这项研究中，使用多种技术，包括扫描电子显微镜、X 射线光电子能谱和俄歇电子能谱，研究了粉末再利用对 Ti-6Al-4V 粉末表面特性的影响。揭示和讨论了表面形貌和化学的整体或局部改性，这有助于制定粉末回收策略。与新鲜的原始粉末相比，回收后观察到“磨损”和更粗糙的粉末颗粒。同时，平均氧化物厚度略有增加，在表面发现较少的Al富集。观察到不同粉末颗粒上或同一颗粒上不同位置的局部化学/氧化物厚度。