Strain rate sensitivity, microstructure variations, and stress-assisted β → α" phase transformation investigation on the mechanical behavior of dual-phase titanium alloys
Abstract
In this study, the microstructures of three widely used dual-phase titanium alloys: Ti-6Al-4V, Ti-6Al-2Sn-4Zr-2Mo, and Ti-6Al-2Sn-4Zr-6Mo are characterized using backscatter electron imaging and the deformation behaviors in their individual α and β phases are investigated using in situ high-energy X-ray diffraction during uniaxial tension experiments. This is accompanied by calculation of the strain rate sensitivity (SRS) in these alloys, as a function of applied loading. The results of the calculated SRS and the mechanical response (in terms of lattice strains and hardening behaviors) are rationalized based on the local microstructure, composition, and texture of the alloy. A stress-induced β (BCC) to α" (orthorhombic) phase transformation is observed during the in-situ diffraction experiment, which permitted analysis of the lattice strain evolution during the phase transformation. Results from this study provide insights into the relationship between microstructure, composition, applied loading, and the deformation behavior, including effects on loading with time holds. Specifically, the results show that the microstructure, and not necessarily the chemical composition (Mo content), along with the applied loading have a dominant role in the observed SRS variation in titanium alloys. Further, the evolution of the α" (orthorhombic) phase is observed for the first time during deformation of an industriallymore »
- Authors:
-
- Purdue Univ., West Lafayette, IN (United States)
- Argonne National Lab. (ANL), Lemont, IL (United States)
- Publication Date:
- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Org.:
- Pratt & Whitney; USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1659435
- Grant/Contract Number:
- AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Materials Characterization
- Additional Journal Information:
- Journal Volume: 166; Journal ID: ISSN 1044-5803
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Ti-6Al-2Sn-4Zr-2Mo; Ti-6Al-2Sn-4Zr-6Mo; Ti-6Al-4V; dwell sensitivity; orthorhombic α" phase; stress induced phase transformation
Citation Formats
Kapoor, Kartik, Ravi, Priya, Naragani, Diwakar, Park, Jun-Sang, Almer, Jonathan D., and Sangid, Michael D. Strain rate sensitivity, microstructure variations, and stress-assisted β → α" phase transformation investigation on the mechanical behavior of dual-phase titanium alloys. United States: N. p., 2020.
Web. doi:10.1016/j.matchar.2020.110410.
Kapoor, Kartik, Ravi, Priya, Naragani, Diwakar, Park, Jun-Sang, Almer, Jonathan D., & Sangid, Michael D. Strain rate sensitivity, microstructure variations, and stress-assisted β → α" phase transformation investigation on the mechanical behavior of dual-phase titanium alloys. United States. https://doi.org/10.1016/j.matchar.2020.110410
Kapoor, Kartik, Ravi, Priya, Naragani, Diwakar, Park, Jun-Sang, Almer, Jonathan D., and Sangid, Michael D. Fri .
"Strain rate sensitivity, microstructure variations, and stress-assisted β → α" phase transformation investigation on the mechanical behavior of dual-phase titanium alloys". United States. https://doi.org/10.1016/j.matchar.2020.110410. https://www.osti.gov/servlets/purl/1659435.
@article{osti_1659435,
title = {Strain rate sensitivity, microstructure variations, and stress-assisted β → α" phase transformation investigation on the mechanical behavior of dual-phase titanium alloys},
author = {Kapoor, Kartik and Ravi, Priya and Naragani, Diwakar and Park, Jun-Sang and Almer, Jonathan D. and Sangid, Michael D.},
abstractNote = {In this study, the microstructures of three widely used dual-phase titanium alloys: Ti-6Al-4V, Ti-6Al-2Sn-4Zr-2Mo, and Ti-6Al-2Sn-4Zr-6Mo are characterized using backscatter electron imaging and the deformation behaviors in their individual α and β phases are investigated using in situ high-energy X-ray diffraction during uniaxial tension experiments. This is accompanied by calculation of the strain rate sensitivity (SRS) in these alloys, as a function of applied loading. The results of the calculated SRS and the mechanical response (in terms of lattice strains and hardening behaviors) are rationalized based on the local microstructure, composition, and texture of the alloy. A stress-induced β (BCC) to α" (orthorhombic) phase transformation is observed during the in-situ diffraction experiment, which permitted analysis of the lattice strain evolution during the phase transformation. Results from this study provide insights into the relationship between microstructure, composition, applied loading, and the deformation behavior, including effects on loading with time holds. Specifically, the results show that the microstructure, and not necessarily the chemical composition (Mo content), along with the applied loading have a dominant role in the observed SRS variation in titanium alloys. Further, the evolution of the α" (orthorhombic) phase is observed for the first time during deformation of an industrially relevant titanium alloy, Ti-6246.},
doi = {10.1016/j.matchar.2020.110410},
journal = {Materials Characterization},
number = ,
volume = 166,
place = {United States},
year = {Fri May 29 00:00:00 EDT 2020},
month = {Fri May 29 00:00:00 EDT 2020}
}
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