Segregation of Mo atoms into stacking faults in CrFeCoNiMo alloy |
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| Authors: | Kaisheng Ming |
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| Institution: | 1. Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, Beijing, People’s Republic of China;2. Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln, USA |
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| Abstract: | Solute segregation at dislocations can impede the motion of dislocations, strengthening materials. Here, we study the formation and role of solute segregation at dislocations in CrFeCoNiMo high-entropy alloys (HEAs) by high-angle annular dark-field scanning transmission electron microscopy imaging and mechanical testing both deformed and annealed samples. Mo atoms exhibit pronounced segregation into the planar-extended core of dislocations, i.e. stacking faults, causing the increase in the yield strength while the loss of the ductility. This work suggests that mechanical properties of HEAs can be tailored by alloying additional elements that are in favour of segregation into dislocations. |
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| Keywords: | High-entropy alloys segregation strengthening stacking faults |
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