| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Materials Design and Alloy Development II
|
| Presentation Title |
A-62: High-temperature Compressive and Creep Properties of Equiatomic CoCrFeMnNi High-entropy Alloy Manufactured by Selective Laser Melting |
| Author(s) |
Kee-Ahn Lee, Young-Kyun Kim, Sangsun Yang |
| On-Site Speaker (Planned) |
Kee-Ahn Lee |
| Abstract Scope |
An equiatomic CoCrFeMnNi high-entropy alloy (HEA) was manufactured by using selective laser melting (SLM), and its microstructure, high-temperature compressive and high-temperature creep properties were investigated. SLM-built equiatomic CoCrFeMnNi HEA shows dislocation networks, strongly-oriented grains and nano-sized precipitates. It was found that the SLM-built HEA has superior yield-strengths at all temperature ranges compared with cast- and wrought-HEAs. In particular, YS difference between SLM-HEA (551 MPa) and cast-HEA (119 MPa) was 432 MPa at 600 °C. Slip and deformation twin behaviors were observed at temperature ranges up to 600 °C, but above 700 °C, slip and partial-recrystallization occurred. SLM-built HEA shows excellent high-temperature creep resistance compared with cast- and recrystallized-HEAs in all stress ranges. Viscous glide motions of dislocations dragging solute-atmospheres was detected at relatively lower stress conditions but different creep mechanism (climb) appeared at higher stress conditions. Correlations between microstructure, high temperature deformation and creep mechanisms were also discussed. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |