Microstructure development and strengthening behaviour in hot-extruded Ti-Mo alloys with exceptional strength-ductility balance

Huang, Jeff; Bahador, Abdollah; Kondoh, Katsuyoshi

Journal of Alloys and Compounds, 2025, 1010, 177195

アクセス数:402件（2025-09-01 14:50 集計）

固定URL: https://hdl.handle.net/11094/98595

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タイトル
Microstructure development and strengthening behaviour in hot-extruded Ti-Mo alloys with exceptional strength-ductility balance
著者
researchmap permalink
jhuang jhuang
著者名
Huang, Jeff
NRID
1000080867614 1000080867614
researchmap permalink
Abdollah_Bahador Abdollah_Bahador
著者名
Bahador, Abdollah
NRID
1000050345138 1000050345138
researchmap permalink
kondoh kondoh
Scopus Author ID
9942942300 9942942300
著者名
Kondoh, Katsuyoshi
キーワード等
Mechanical properties
Microstructure
Strengthening mechanisms
Thermomechanical processing
Titanium alloys
内容
Huang J., Bahador A., Kondoh K. Microstructure development and strengthening behaviour in hot-extruded Ti-Mo alloys with exceptional strength-ductility balance. Journal of Alloys and Compounds 1010, 177195 (2025); https://doi.org/10.1016/j.jallcom.2024.177195.
抄録
A series of strong and ductile Ti-Mo alloys containing 2.5, 5, 7.5 and 10 wt% Mo was experimentally investigated by a two-stage blended-elemental powder metallurgy process. This process consisted of a spark plasma sintering stage for powder-consolidation and in-situ-homogenisation, and a hot extrusion stage for densification and microstructure enhancement. Microstructures in the extruded alloys changed from α dominant to β dominant with molybdenum addition. Simultaneously, a grain refinement effect was observed due to suppressed α precipitation and increase β retention. A significant strengthening effect was observed with molybdenum addition. In comparison with similarly processed commercially pure titanium, Ti-10Mo exhibited a yield strength improvement of 290 % to 1382.8 MPa, and an ultimate tensile strength improvement of 239 % to 1496.5 MPa. Meanwhile, Ti-5Mo exhibited a yield strength improvement of 211 % (1007.9 MPa) without any substantial reduction in ductility, resulting in an exceptional tensile toughness of 361.3 MJ.m−3. A quantitative analysis of strengthening mechanisms reveals considerable strengthening effects from solid solution strengthening, dislocation strengthening, and grain refinement effects. These factors arise from the novel multi-modal microstructures formed by thermomechanical processing at super-transus temperatures. The newly achieved balance of strength and ductility appears to be unrivalled amongst all previously reported binary Ti-Mo alloys.
出版者
Elsevier Ltd
収録物名
Journal of Alloys and Compounds
巻(号)
1010
ページ
177195
刊行年月
2025-01-05
言語
英語
ハンドルURL
https://hdl.handle.net/11094/98595
PISSN
09258388
関連情報 (isIdenticalTo)
DOI (出版社版)
https://doi.org/10.1016/j.jallcom.2024.177195
アクセス権
open access
権利情報
This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
出版タイプ
Version of Record
カテゴリ
学術雑誌論文 Journal Article