| Autor: |
Tomonori Kitashima, Takanobu Hiroto, Dennis Edgard Jodi, Makoto Watanabe |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
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| Zdroj: |
Materials & Design, Vol 243, Iss , Pp 113039- (2024) |
| Druh dokumentu: |
article |
| ISSN: |
0264-1275 |
| DOI: |
10.1016/j.matdes.2024.113039 |
| Popis: |
A near-β Ti alloy with a highly anisotropic single-crystal-like β grain structure was fabricated on a polycrystalline pure-Ti substrate by laser powder bed fusion (LPBF) using a flat-top laser with bidirectional scanning and 90° hatch rotation. The as-fabricated specimen had an acicular microstructure with 12 α variants. β-annealing followed by air-cooling revealed the growth of columnar β grains with a 〈001〉 orientation in the build direction from the center outward with increasing height, which formed a highly anisotropic β grain structure with a 〈001〉 orientation in the build direction and 〈100〉 or 〈010〉 orientation along the scan direction with low-angle grain boundaries (LAGBs) in the β matrix. The predominant 〈21¯1¯0〉-oriented and minor 〈101¯2〉-oriented α phases precipitated in the 〈001〉-oriented β matrix according to the Burgers orientation relationship. The 〈101¯2〉-oriented α phase was found to form on some LAGBs. Notably, a single α variant was widely distributed without forming multiple-variant clusters across the highly anisotropic β grain structure. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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Full Text from ScienceDirect