About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Advances in Multi-Principal Element Alloys III: Mechanical Behavior
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Presentation Title |
Single Defect-driven Deformation Mechanism in VCoNi Medium-entropy Alloy at 15 K |
Author(s) |
Muhammad Naeem, Yuemin Ma, Jin Tian, Gong Wu, Stefanus Harjo, Xun-Li Wang |
On-Site Speaker (Planned) |
Muhammad Naeem |
Abstract Scope |
Face-centered cubic (fcc) multicomponent medium- and high-entropy alloys (M/HEAs) have been shown to have increased ductility at cryogenic temperatures. The formation of planar faults (stacking faults and twin faults) and martensitic phase transformation due to a decrease in stacking fault energy has been attributed to the increase in ductility with decreasing temperature. Among fcc multicomponent alloys, VCoNi has the highest yield strength with outstanding ductility at room temperature. In this study, we used in situ neutron diffraction to investigate the deformation behavior of an equiatomic VCoNi alloy at a very low temperature of 15 K. Similar to other fcc M/HEAs, the alloy showed an increase in ductility at 15 K. Unlike other systems, VCoNi did not develop stacking faults, deformation twins or martensite at such low temperature. From room temperature to 15 K, deformation was shown to be mediated by dislocation slip. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Entropy Alloys, Mechanical Properties, Characterization |