About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Ultrafine-grained and Heterostructured Materials (UFGH XII)
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Presentation Title |
Significance of Grain Refinement on Micro-mechanical Properties and Structures of Additive-manufactured CoCrFeNi High-entropy Alloy |
Author(s) |
Jae-Kyung Han, Yulia O. Kuzminova, Stanislav A. Evlashin, Jae-il Jang, Klaus-Dieter Liss, Megumi Kawasaki |
On-Site Speaker (Planned) |
Jae-Kyung Han |
Abstract Scope |
An additive-manufactured high-entropy alloy (HEA) CoCrFeNi having an f.c.c structure was processed by high-pressure torsion (HPT) at room temperature up to 8 turns under 6.0 GPa. Significance of grain refinement was investigated on their mechanical properties and microstructures. Successful grain refinement was introduced within the processed disks containing an equiaxed grain structure with an average size of 90 nm after 8 turns by HPT. Structural evolution examined by X-ray diffraction analysis demonstrates a decrease in crystallite size and an increase in lattice parameter. Mechanical responses on different length-scales were examined by Vickers microhardness and nanoindentation which reveal the high strain hardenability and increased plasticity of the nanostructured HEA. This study demonstrates considerable potential for utilizing severe plastic deformation for exploring post-manufacturing treatments to enhance physical and mechanical properties in additive-manufactured HEAs |
Proceedings Inclusion? |
Planned: |