Atomistic Investigation on the Strengthening Mechanism of Single Crystal Ni-Based Superalloy under Complex Stress States
Single crystal Ni-based superalloy, with excellent mechanical properties in high temperature, always works under complex stress states, including multiaxial tension and compression, which results in various strengthening mechanisms. In this paper, the atomistic simulation is applied to investigate t...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-05-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/12/5/889 |
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| author | Bin Xie Xinyu Wang Yongsheng Fan Ruizhi Li |
| author_facet | Bin Xie Xinyu Wang Yongsheng Fan Ruizhi Li |
| author_sort | Bin Xie |
| collection | DOAJ |
| description | Single crystal Ni-based superalloy, with excellent mechanical properties in high temperature, always works under complex stress states, including multiaxial tension and compression, which results in various strengthening mechanisms. In this paper, the atomistic simulation is applied to investigate the microstructure evolution under complex mechanical loading conditions, including uniaxial, equibiaxial, and non-equibiaxial tensile–compressive loadings. By comparison of the strain–stress curves and analysis of dislocation motion, it is believed that the tension promotes the bowing out of dislocations into the channel at loading direction, while compression limits it. Moreover, the dislocation analysis shows that the initial dislocation network, comprised of Lomer dislocations, will dissociate to form Lomer–Cottrell lock upon loading, which acts as a barrier to the further glide of dislocations. The mechanism of dislocation evolution is analyzed in detail by combining Schmid factor analysis and the comparison of energy density difference between γ and γ′ phases. |
| first_indexed | 2024-03-10T03:25:24Z |
| format | Article |
| id | doaj.art-c446d63f4d654d5ca77688e508f3d335 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T03:25:24Z |
| publishDate | 2022-05-01 |
| publisher | MDPI AG |
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| series | Metals |
| spelling | doaj.art-c446d63f4d654d5ca77688e508f3d3352023-11-23T12:10:55ZengMDPI AGMetals2075-47012022-05-0112588910.3390/met12050889Atomistic Investigation on the Strengthening Mechanism of Single Crystal Ni-Based Superalloy under Complex Stress StatesBin Xie0Xinyu Wang1Yongsheng Fan2Ruizhi Li3School of Astronautics, Beihang University, Beijing 102206, ChinaSchool of Astronautics, Beihang University, Beijing 102206, ChinaSchool of Energy and Power Engineering, Beihang University, Beijing 102206, ChinaSchool of Astronautics, Beihang University, Beijing 102206, ChinaSingle crystal Ni-based superalloy, with excellent mechanical properties in high temperature, always works under complex stress states, including multiaxial tension and compression, which results in various strengthening mechanisms. In this paper, the atomistic simulation is applied to investigate the microstructure evolution under complex mechanical loading conditions, including uniaxial, equibiaxial, and non-equibiaxial tensile–compressive loadings. By comparison of the strain–stress curves and analysis of dislocation motion, it is believed that the tension promotes the bowing out of dislocations into the channel at loading direction, while compression limits it. Moreover, the dislocation analysis shows that the initial dislocation network, comprised of Lomer dislocations, will dissociate to form Lomer–Cottrell lock upon loading, which acts as a barrier to the further glide of dislocations. The mechanism of dislocation evolution is analyzed in detail by combining Schmid factor analysis and the comparison of energy density difference between γ and γ′ phases.https://www.mdpi.com/2075-4701/12/5/889single crystal Ni-based superalloystrengthening mechanismcomplex stress statesatomistic simulation |
| spellingShingle | Bin Xie Xinyu Wang Yongsheng Fan Ruizhi Li Atomistic Investigation on the Strengthening Mechanism of Single Crystal Ni-Based Superalloy under Complex Stress States Metals single crystal Ni-based superalloy strengthening mechanism complex stress states atomistic simulation |
| title | Atomistic Investigation on the Strengthening Mechanism of Single Crystal Ni-Based Superalloy under Complex Stress States |
| title_full | Atomistic Investigation on the Strengthening Mechanism of Single Crystal Ni-Based Superalloy under Complex Stress States |
| title_fullStr | Atomistic Investigation on the Strengthening Mechanism of Single Crystal Ni-Based Superalloy under Complex Stress States |
| title_full_unstemmed | Atomistic Investigation on the Strengthening Mechanism of Single Crystal Ni-Based Superalloy under Complex Stress States |
| title_short | Atomistic Investigation on the Strengthening Mechanism of Single Crystal Ni-Based Superalloy under Complex Stress States |
| title_sort | atomistic investigation on the strengthening mechanism of single crystal ni based superalloy under complex stress states |
| topic | single crystal Ni-based superalloy strengthening mechanism complex stress states atomistic simulation |
| url | https://www.mdpi.com/2075-4701/12/5/889 |
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