| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
2022 Undergraduate Student Poster Contest
|
| Presentation Title |
Heat Treatment Effect on Microstructural Evolution of Quaternary High Entropy Alloy |
| Author(s) |
Nilufar Kholmuratova, Malikabonu Sobirova, Zulfiya Usmonova, Khilola Umarova, Elyorjon Jumaev |
| On-Site Speaker (Planned) |
Nilufar Kholmuratova |
| Abstract Scope |
The microstructural evolution and the mechanical characteristics of quaternary AlCoCrNi high entropy alloys were investigated, which were heat-treated at 873 K for 72 hours and 192 hours. The nano structural variations and the phase transformation were observed depending on the heat treatment time, such as the B2 dendrite + BCC interdendrite and the σ phases, which were 72 hours, and the B2 dendrite and σ phases + BCC interdendrite, which were 192 hours. After the heat treatment, the morphology of the dendrite region changed from spherical to needle-like, and the interdendrite region changed from spinodal-like to plate-like morphology. Meanwhile, a phase transformation was noticed in the dendrite region as well. The formation of a sigma phase in the AlCoCrNi high entropy alloy dramatically enhances the yield strength of the alloy from 1753 MPa to 2925 MPa while reducing its ductility between 16.71% and 0.62%. |