About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Advances in Multi-Principal Elements Alloys X: Alloy Development and Properties
|
Presentation Title |
Effect of Fe Contents on Plane Stress Fracture Toughness of
Fex(CoCrMnNi)100-x High Entropy Alloys at Cryogenic Temperature |
Author(s) |
Sangeun Park, Nokeun Park, Im Doo Jung, Jae Bok Seol, Jung Gi Kim, Hyokyung Sung |
On-Site Speaker (Planned) |
Sangeun Park |
Abstract Scope |
Fe addition and light-weight design is highly effective to expand the application field of high entropy alloys (HEAs). Meanwhile, stacking fault energy is decreased with increasing Fe contents, thus governing deformation mechanism is changed from twinning induced plasticity (TWIP) to transformation induced plasticity (TRIP). As the thickness of HEAs decreases, plane stress fracture toughness test is necessarily required to evaluate the properties of thin plate. In this study, plane stress fracture toughness of Fex(CoCrMnNi)100-x (x = 20, 40, 60 wt.%) alloys are evaluated at cryogenic temperature. In the Fe40 specimen, crack growth is blocked by the twins as well as ε-martensite. While in the Fe60 specimen, a large amount of α'-martensite is transformed, cracks cannot propagate through α'-martensite. The deformation twin and transformed martensite in front of crack tip aid to interrupt crack growth in HEAs leading to severe crack blunting at cryogenic temperature. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Entropy Alloys, Mechanical Properties, Phase Transformations |