About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys II
|
| Presentation Title |
J-55: Minor Addition of Boron on Macro- and Micro-Mechanical Properties of Refractory High-Entropy Alloys |
| Author(s) |
Ping-Hsu Ko, Ya-Jing Lee, Shou-Yi Chang |
| On-Site Speaker (Planned) |
Ping-Hsu Ko |
| Abstract Scope |
Refractory high-entropy alloys with good mechanical properties and high thermal stability have been intensively developed for applications at elevated temperatures. However, many of them suffer from the problem of intergranular fracture-caused low ductility. Their macro-mechanical properties and microscale plastic deformation as well as the strengthening of grain boundary are worth investigations for improving fracture toughness. In this study, 0.1 at.% boron was added in HfMoxNbTaTiZrVy alloys, and the nanoindetations of differently-oriented grains, micropillar compression tests and macro-compression tests were conducted. Nanoindenting hardness indicated that these alloys exhibited lessened plastic anisotropy. The compression of micropillars showed uniform plastic deformation with multiple small slip traces and a high work hardening rate, instead of large load drops. In the macro-compression tests, the alloys had high yield strengths of 1500 MPa but low ductility. With the minor addition of boron, the ductility was improved, and the intergranular fracture was inhibited. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, High-Temperature Materials, Mechanical Properties |