| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Heterostructured and Gradient Materials (HGM VI): Principle, Processing and Properties
|
| Presentation Title |
Improved Cryogenic Mechanical Properties of Heterostructured CrCoNi Multicomponent Alloy |
| Author(s) |
Liliana Romero Resendiz, Muhammad Naeem, Xun-Li Wang, Yuntian Zhu |
| On-Site Speaker (Planned) |
Liliana Romero Resendiz |
| Abstract Scope |
Heterostructured materials have been shown to enhance the strength-ductility balance of traditional alloys, but their performance at cryogenic temperatures during real-time deformation has been scarcely unexplored. This study examined a heterostructured CrCoNi medium-entropy alloy using in-situ neutron diffraction at cryogenic (77 K) and room (293 K) temperatures. Due to the significant grain size disparity, the interfaces between fine and coarse grains exhibited high mechanical mismatch, leading to an exceptional yield strength of 918 MPa at 293 K. At 77 K, the yield strength increased to 1244 MPa with a remarkable uniform elongation of 34%. This outstanding strength-ductility combination at 77 K is attributed to the enhanced density of geometrically necessary dislocation pile-ups, increased planar faults, and martensitic phase transformation. Comparing these results with homogeneous counterparts highlights the potential of heterostructured materials as a novel approach to enhance the mechanical performance of various materials, including medium-/high-entropy alloys, for cryogenic applications. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Mechanical Properties, Phase Transformations |