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  Effects of Mo on the mechanical behavior of γ/γʹ-strengthened Co–Ti-based alloys

Im, H. J., Lee, S., Choi, W. S., Makineni, S. K., Raabe, D., Ko, W.-S., et al. (2020). Effects of Mo on the mechanical behavior of γ/γʹ-strengthened Co–Ti-based alloys. Acta Materialia, 197, 69-80. doi:10.1016/j.actamat.2020.07.037.

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 Creators:
Im, Hye Ji1, Author              
Lee, Subin2, Author              
Choi, Won Seok3, Author              
Makineni, Surendra Kumar4, Author              
Raabe, Dierk5, Author              
Ko, Won-Seok6, Author              
Choi, Pyuck-Pa7, Author              
Affiliations:
1Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, South Korea, ou_persistent22              
2Advanced Transmission Electron Microscopy, Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863399              
3Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, South Korea, ou_persistent22              
4Atom Probe Tomography, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863384              
5Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863381              
6School of Materials Science and Engineering, University of Ulsan, 44610 Ulsan, Republic of Korea, ou_persistent22              
7Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea, ou_persistent22              

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Free keywords: Binary alloys; Cobalt alloys; Cobalt metallography; Density functional theory; Molybdenum alloys; Molybdenum metallography; Shear flow; Strain hardening; Ternary alloys; Titanium metallography, Dislocation sources; Electron channeling contrasts; Elevated temperature; Higher-energy barriers; Mechanical behavior; Planar fault energies; Slip band formation; Strain hardening behavior, Titanium alloys
 Abstract: We investigated the flow behavior of γ/γʹ-strengthened Co-12Ti and Co-12Ti-4Mo (at.) alloys at room and elevated temperatures (up to 900°C) by electron microscopy and density functional theory. The Mo-added alloy exhibited an enhanced compressive yield strength and strain hardening behavior as compared to the reference binary alloy. This behavior could be attributed to a ~25 larger γʹ volume fraction and ~7 higher planar fault energies in Co-12Ti-4Mo. Using electron channeling contrast imaging, we observed interrupted slip bands in the Co-12Ti-4Mo alloy deformed to a strain of 6, which led to enhanced strain hardening, in contrast to extended slip bands along 111 planes in the Co-12Ti alloy. Interrupted slip band formation in Co-12Ti-4Mo could be explained by rapid exhaustion of dislocation sources and a higher energy barrier required to cut the γʹ precipitates. These effects are due to a reduced γ channel width and substantial hardening effect of γʹ-Co3(Ti,Mo) in the ternary alloy as well as due to the large shear modulus difference between γʹ and γ. © 2020

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Language(s): eng - English
 Dates: 2020-09-15
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.actamat.2020.07.037
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Title: Acta Materialia
  Abbreviation : Acta Mater.
Source Genre: Journal
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Publ. Info: Kidlington : Elsevier Science
Pages: - Volume / Issue: 197 Sequence Number: - Start / End Page: 69 - 80 Identifier: ISSN: 1359-6454
CoNE: https://pure.mpg.de/cone/journals/resource/954928603100