https://scholars.lib.ntu.edu.tw/handle/123456789/597964
標題: | Mechanical properties and deformation mechanisms in CoCrFeMnNi high entropy alloys: A molecular dynamics study | 作者: | Chen K.-T Wei T.-J Li G.-C Chen M.-Y Chen Y.-S Chang S.-W Yen H.-W SHU-WEI CHANG HUNG-WEI YEN |
關鍵字: | Deformation;Ductility;High entropy alloys;Mechanism;Molecular dynamics;Strength;Chromium alloys;Cobalt alloys;Entropy;High-entropy alloys;Iron alloys;Manganese alloys;Mechanisms;Stacking faults;Twinning;Deformation mechanism;Deformation twinning;Dynamic studies;Dynamics simulation;Fault energy;Mechanical deformation;Property;Stackings | 公開日期: | 2021 | 卷: | 271 | 來源出版物: | Materials Chemistry and Physics | 摘要: | We used molecular dynamics simulations to investigate the relationship between mechanical properties and deformation mechanisms in CoCrFeMnNi alloys having different compositions. According to deformation twinning activity, the deformation mechanisms in the different CoCrFeMnNi compositions under tensile loading can be classified into three major categories: easy-shear (ES), inter-locks (IL) and bulk hexagonal closed packed (hcp) transformation (BH). We found that the compositions with ES were more likely to rupture early because of the short and fragmented twins. The compositions following the IL pattern promoted the movement of interlocking stacking faults in the twin boundaries that could prolong tensile deformation. Moreover, BH could further increase ductility because the hcp transformation could absorb and dissipate the stacking faults. Experimental observations of immobile stacking-fault networks that impede dislocation motion and further provide preferred sites for the formation of the hcp phase were commonly found in the ES, IL and BH patterns. The calculated intrinsic stacking fault energies of CoCrFeMnNi and CoCrFeNi were consistent with the experimental measurements. The combination of high unstable stacking fault energy with the formation of the IL pattern results in high strength and high ductility in the CoCrFeMnNi HEA system. ? 2021 Elsevier B.V. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85109210502&doi=10.1016%2fj.matchemphys.2021.124912&partnerID=40&md5=77a4a67e3afaed9d83c54af20d7bca99 https://scholars.lib.ntu.edu.tw/handle/123456789/597964 |
ISSN: | 02540584 | DOI: | 10.1016/j.matchemphys.2021.124912 |
顯示於: | 土木工程學系 |
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