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Development of stro...
Development of strong and ductile metastable face-centered cubic single-phase high-entropy alloys
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- Wei, Daixiu (författare)
- Tohoku Univ, Inst Mat Res, 2-1-1 Katahira, Sendai, Miyagi 9808577, Japan.
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- Li, Xiaoqing (författare)
- KTH,Materialvetenskap
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- Schönecker, Stephan (författare)
- KTH,Materialvetenskap
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- Jiang, Jing (författare)
- Tohoku Univ, Inst Mat Res, 2-1-1 Katahira, Sendai, Miyagi 9808577, Japan.
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- Choi, Won-Mi (författare)
- Pohang Univ Sci & Technol POSTEC, Dept Mat Sci & Engn, Pohang 37673, South Korea.
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- Lee, Byeong-Joo (författare)
- Pohang Univ Sci & Technol POSTEC, Dept Mat Sci & Engn, Pohang 37673, South Korea.
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- Kim, Hyoung Seop (författare)
- Pohang Univ Sci & Technol POSTEC, Dept Mat Sci & Engn, Pohang 37673, South Korea.
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- Chiba, Akihiko (författare)
- Tohoku Univ, Inst Mat Res, 2-1-1 Katahira, Sendai, Miyagi 9808577, Japan.
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- Kato, Hidemi (författare)
- Tohoku Univ, Inst Mat Res, 2-1-1 Katahira, Sendai, Miyagi 9808577, Japan.
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Tohoku Univ, Inst Mat Res, 2-1-1 Katahira, Sendai, Miyagi 9808577, Japan Materialvetenskap (creator_code:org_t)
- PERGAMON-ELSEVIER SCIENCE LTD, 2019
- 2019
- Engelska.
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Ingår i: Acta Materialia. - : PERGAMON-ELSEVIER SCIENCE LTD. - 1359-6454 .- 1873-2453. ; 181, s. 318-330
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Face-centered cubic (fcc)-phase high-entropy alloys (HEAs) have attracted much academic interest, with the stacking fault energy (SFE) playing an important role in regulating their mechanical behaviors. Here, we revealed the principles for regulating both the elastic and plastic behaviors by composition modification and Mo addition in an fcc-phase quaternary CoCrFeNi system with the assistance of ab initio and thermodynamics calculations. An increase in Co content and a decrease in Fe and Ni contents reduced the fcc phase stability and SFE, but enhanced the elastic modulus, anisotropy, and lattice friction stress. A minor substitution of Co by Mo increased the lattice constant, but decreased the SFE and elastic modulus. Based on these findings, we developed a series of strong and ductile metastable fcc-phase CoxCr25(FeNi)(70-x)Mo-5 (x = 30, 40, 50) HEAs with mechanical properties superior to those of the CoCrFeNi HEM. The careful investigation revealed that the enhanced mechanical properties are due to the Mo-addition-induced strengthening accompanied with a low-SFE-induced restriction of planar behavior of dislocations, mechanical twinning, and strain-induced martensitic transformation. The findings shed light on the development of high-performance HEAs.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Materialteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering (hsv//eng)
Nyckelord
- High-entropy alloy
- Metastable
- Stacking fault energy
- Twinning
- Martensitic transformation
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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