| About this Abstract |
| Meeting |
3rd World Congress on High Entropy Alloys (HEA 2023)
|
| Symposium
|
HEA 2023
|
| Presentation Title |
The Compositional Dependence of Deformation Mechanisms, Strength, and Ductility in a Pseudo-binary Cr-Co-Ni Alloy System |
| Author(s) |
Joshua L. Cicotte, Ying Yang, Dunji Yu, Ke An, Weicheng Zhong, Easo George |
| On-Site Speaker (Planned) |
Joshua L. Cicotte |
| Abstract Scope |
We investigated the mechanical properties and deformation mechanisms off-equiatomic variants of the CrCoNi medium-entropy alloy, specifically the Co-rich alloys in the pseudo-binary Cr33-Co(x)-Ni(67-x) system. Based on neutron diffraction, we find that the Co33, Co40, and Co50 alloys are FCC solid solutions after quenching from elevated temperature whereas the Co57 alloy retains some martensitic HCP phase in an FCC solid solution. Tensile testing revealed that ductility decreases linearly with increasing Co content from a maximum in the equiatomic Co33 alloy. Ex-situ neutron diffraction of the fractured tensile specimens found significant amounts of deformation-induced HCP martensite formed during tensile testing in the Co40, Co50, and Co57 alloys. The elongation of these alloys shows a linear decrease with increasing HCP volume, directly tying the formation of HCP martensite to the reduction in ductility. Comparisons are also made to our Ni-rich pseudo-binary compositions where twinning rather than phase transformation occurs. |
| Proceedings Inclusion? |
Planned: Metallurgical and Materials Transactions |