Enhanced work hardening from oxygen-stabilized ω precipitates in an aged metastable β Ti-Nb alloy
Abstract
High levels of oxygen in solid solution in Ti alloys are considered detrimental to mechanical properties because of embrittlement concerns. In metastable β titanium alloys, the formation of isothermal ω precipitates is also known to cause severe embrittlement and ductility reduction. However, oxygen has been shown to partition to the ω phase during ageing, and this partitioning behavior may potentially impact ω’s mechanical contribution. Using micropillar compression, we compared the deformation behavior of Ti-20Nb (at. %) with oxygen-stabilized ω precipitates to the behavior of oxygen-free specimens. The oxygen-stabilized microstructures showed increased compressive yield strength and enhanced work hardening behavior compared to oxygen-free specimens. In the absence of oxygen, the compressed pillars showed slip band formation and catastrophic failure, and transmission electron microscopy imaging revealed that ω precipitates were sheared within the continuous deformation channels resulting in slip localization. In contrast, oxygen-stabilized ω precipitates were harder to shear and the formation of continuous deformation channels was suppressed during compression, leading to improved work hardening behavior up to 15% strain. Furthermore, this counter-intuitive role of oxygen may offer design strategies to address the significant embrittlement and loss of ductility observed for ω-strengthened β Ti alloys without oxygen and avenues to expand themore »
- Authors:
-
- Univ. of Michigan, Ann Arbor, MI (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); National Science Foundation (NSF)
- OSTI Identifier:
- 1821381
- Alternate Identifier(s):
- OSTI ID: 1829109
- Report Number(s):
- LA-UR-21-24883
Journal ID: ISSN 1359-6454
- Grant/Contract Number:
- 89233218CNA000001; DMR-1436154; CMMI-1729166
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Acta Materialia
- Additional Journal Information:
- Journal Volume: 220; Journal ID: ISSN 1359-6454
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Material science; Titanium alloys; Precipitation; Omega phase; Compression test; Oxygen
Citation Formats
Chou, Kathleen, Li, Nan, and Marquis, Emmanuelle A. Enhanced work hardening from oxygen-stabilized ω precipitates in an aged metastable β Ti-Nb alloy. United States: N. p., 2021.
Web. doi:10.1016/j.actamat.2021.117302.
Chou, Kathleen, Li, Nan, & Marquis, Emmanuelle A. Enhanced work hardening from oxygen-stabilized ω precipitates in an aged metastable β Ti-Nb alloy. United States. https://doi.org/10.1016/j.actamat.2021.117302
Chou, Kathleen, Li, Nan, and Marquis, Emmanuelle A. Thu .
"Enhanced work hardening from oxygen-stabilized ω precipitates in an aged metastable β Ti-Nb alloy". United States. https://doi.org/10.1016/j.actamat.2021.117302. https://www.osti.gov/servlets/purl/1821381.
@article{osti_1821381,
title = {Enhanced work hardening from oxygen-stabilized ω precipitates in an aged metastable β Ti-Nb alloy},
author = {Chou, Kathleen and Li, Nan and Marquis, Emmanuelle A.},
abstractNote = {High levels of oxygen in solid solution in Ti alloys are considered detrimental to mechanical properties because of embrittlement concerns. In metastable β titanium alloys, the formation of isothermal ω precipitates is also known to cause severe embrittlement and ductility reduction. However, oxygen has been shown to partition to the ω phase during ageing, and this partitioning behavior may potentially impact ω’s mechanical contribution. Using micropillar compression, we compared the deformation behavior of Ti-20Nb (at. %) with oxygen-stabilized ω precipitates to the behavior of oxygen-free specimens. The oxygen-stabilized microstructures showed increased compressive yield strength and enhanced work hardening behavior compared to oxygen-free specimens. In the absence of oxygen, the compressed pillars showed slip band formation and catastrophic failure, and transmission electron microscopy imaging revealed that ω precipitates were sheared within the continuous deformation channels resulting in slip localization. In contrast, oxygen-stabilized ω precipitates were harder to shear and the formation of continuous deformation channels was suppressed during compression, leading to improved work hardening behavior up to 15% strain. Furthermore, this counter-intuitive role of oxygen may offer design strategies to address the significant embrittlement and loss of ductility observed for ω-strengthened β Ti alloys without oxygen and avenues to expand the use of β Ti alloys.},
doi = {10.1016/j.actamat.2021.117302},
journal = {Acta Materialia},
number = ,
volume = 220,
place = {United States},
year = {Thu Sep 09 00:00:00 EDT 2021},
month = {Thu Sep 09 00:00:00 EDT 2021}
}
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