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

Number of Access:431（2025-10-05 07:55 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/98595

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Title
Microstructure development and strengthening behaviour in hot-extruded Ti-Mo alloys with exceptional strength-ductility balance
Creator
researchmap permalink
jhuang jhuang
CreatorName
Huang, Jeff
NRID
1000080867614 1000080867614
researchmap permalink
Abdollah_Bahador Abdollah_Bahador
CreatorName
Bahador, Abdollah
NRID
1000050345138 1000050345138
researchmap permalink
kondoh kondoh
Scopus Author ID
9942942300 9942942300
CreatorName
Kondoh, Katsuyoshi
Subject
Mechanical properties
Microstructure
Strengthening mechanisms
Thermomechanical processing
Titanium alloys
Description
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.
Abstract
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.
Publisher
Elsevier Ltd
Source Title
Journal of Alloys and Compounds
Volume (Issue)
1010
Page
177195
Date of Issued
2025-01-05
Language
English
Handle URL
https://hdl.handle.net/11094/98595
PISSN
09258388
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.1016/j.jallcom.2024.177195
Access Rights
open access
CopyRight
This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
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Category
学術雑誌論文 Journal Article