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A compositionally graded Ti-Al alloy with a designed composition range from pure Ti to pure Al was successfully produced by a laser powder bed fusion (L-PBF) system equipped with two powder feeders. The compositionally graded Ti-Al profile is confirmed by scanning electron microscopy, X-ray diffraction analysis, electron backscatter diffraction microscopy, and transmission microscopy. The graded material is free of macro-horizontal cracks, but micro-cracks appear at the center of the sample. Varying the Ti and Al ratio along the build direction induces microstructural changes, transforming alpha+beta-Ti into solid solution, creating intermetallics (Ti and Al), and yielding an Al phase with diverse morphologies. Additionally, the Ti-Al ratio’s influence on microstructure formation and phase evolution results in varying mechanical properties among the graded material’s layers. The results demonstrate that the L-PBF process can achieve continuous compositional grading of Ti-Al materials in a single run. Moreover, this study hold the potential to facilitate the design and production of numerous compositional variants for high entropy alloys and multi-materials, enabling future investigation into microstructural evolution, phase transformation, and physical and mechanical properties.

権利情報:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

キーワード: Laser powder bed fusion process, Compositionally graded materials, Ti–Al alloy, Microstructure, Mechanical properties

刊行年月日: 2024-05-15

出版者: Elsevier BV

掲載誌:

• Materials Science and Engineering: A (ISSN: 09215093) vol. 903 146638

研究助成金:

• Japan Society for the Promotion of Science JP21K03814

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4553

公開URL: https://doi.org/10.1016/j.msea.2024.146638

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更新時刻: 2024-06-24 10:01:25 +0900

MDRでの公開時刻: 2026-05-16 08:25:03 +0900