Experimental and theoretical investigations on the phase stability and mechanical properties of Cr7Mn25Co9Ni23Cu36 high-entropy alloy
Understanding the mechanisms of phase formation and their influence on the mechanical behavior is crucial for materials used in structural applications. Here, the phase decomposition under heat treatment in the Cr7Mn25Co9Ni23Cu36 (atomic percentage) high-entropy alloy and how secondary phases formed...
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| Published in | Acta materialia Vol. 208; p. 116763 |
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| Main Authors | , , , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier Ltd
15.04.2021
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| Subjects | |
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| Abstract | Understanding the mechanisms of phase formation and their influence on the mechanical behavior is crucial for materials used in structural applications. Here, the phase decomposition under heat treatment in the Cr7Mn25Co9Ni23Cu36 (atomic percentage) high-entropy alloy and how secondary phases formed affect its tensile mechanical response are reported. The microstructural analysis shows that heat treatment at 800 °C /2 h and 600 °C /8 h led to the formation of sigma phase, but the sigma phase was not observed for 2 h heat treatment at 600 °C and below. The experimentally observed thermal stability and phases are compared to the calculated phase diagram and rationalized by recourse to thermodynamics and kinetics. The mechanism of phase decomposition is discussed based on ab initio calculations, indicating that decomposition into two solid solution phases is energetically preferred over a single solid solution phase with nominal composition.
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| AbstractList | Understanding the mechanisms of phase formation and their influence on the mechanical behavior is crucial for materials used in structural applications. Here, the phase decomposition under heat treatment in the Cr7Mn25Co9Ni23Cu36 (atomic percentage) high-entropy alloy and how secondary phases formed affect its tensile mechanical response are reported. The microstructural analysis shows that heat treatment at 800 °C /2 h and 600 °C /8 h led to the formation of sigma phase, but the sigma phase was not observed for 2 h heat treatment at 600 °C and below. The experimentally observed thermal stability and phases are compared to the calculated phase diagram and rationalized by recourse to thermodynamics and kinetics. The mechanism of phase decomposition is discussed based on ab initio calculations, indicating that decomposition into two solid solution phases is energetically preferred over a single solid solution phase with nominal composition.
[Display omitted] Understanding the mechanisms of phase formation and their influence on the mechanical behavior is crucial for materials used in structural applications. Here, the phase decomposition under heat treatment in the Cr7Mn25Co9Ni23Cu36 (atomic percentage) high-entropy alloy and how secondary phases formed affect its tensile mechanical response are reported. The microstructural analysis shows that heat treatment at 800 degrees C /2 h and 600 degrees C /8 h led to the formation of sigma phase, but the sigma phase was not observed for 2 h heat treatment at 600 degrees C and below. The experimentally observed thermal stability and phases are compared to the calculated phase diagram and rationalized by recourse to thermodynamics and kinetics. The mechanism of phase decomposition is discussed based on ab initio calculations, indicating that decomposition into two solid solution phases is energetically preferred over a single solid solution phase with nominal composition. |
| ArticleNumber | 116763 |
| Author | Vitos, Levente Qin, Gang Chen, Ruirun Li, Xiaoqing Schönecker, Stephan Yan, Yan Mao, Huahai Li, Xiaojie |
| Author_xml | – sequence: 1 givenname: Gang surname: Qin fullname: Qin, Gang organization: National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, 150001, China – sequence: 2 givenname: Ruirun surname: Chen fullname: Chen, Ruirun email: ruirunchen@hit.edu.cn organization: National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, 150001, China – sequence: 3 givenname: Huahai surname: Mao fullname: Mao, Huahai organization: Department of Materials Science and Engineering, KTH - Royal Institute of Technology, 10044 Stockholm, Sweden – sequence: 4 givenname: Yan orcidid: 0000-0003-1822-1250 surname: Yan fullname: Yan, Yan organization: National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, 150001, China – sequence: 5 givenname: Xiaojie surname: Li fullname: Li, Xiaojie organization: Department of Materials Science and Engineering, KTH - Royal Institute of Technology, 10044 Stockholm, Sweden – sequence: 6 givenname: Stephan surname: Schönecker fullname: Schönecker, Stephan organization: Department of Materials Science and Engineering, KTH - Royal Institute of Technology, 10044 Stockholm, Sweden – sequence: 7 givenname: Levente orcidid: 0000-0003-2832-3293 surname: Vitos fullname: Vitos, Levente organization: Department of Materials Science and Engineering, KTH - Royal Institute of Technology, 10044 Stockholm, Sweden – sequence: 8 givenname: Xiaoqing surname: Li fullname: Li, Xiaoqing organization: Department of Materials Science and Engineering, KTH - Royal Institute of Technology, 10044 Stockholm, Sweden |
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| Keywords | Sigma phase High-entropy alloys Heat treatment Phase diagram calculation Ab initio calculations |
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| SubjectTerms | Ab initio calculations Heat treatment High-entropy alloys Phase diagram calculation Sigma phase |
| Title | Experimental and theoretical investigations on the phase stability and mechanical properties of Cr7Mn25Co9Ni23Cu36 high-entropy alloy |
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