| Autor: |
Xin Wang, Rafael Rodriguez De Vecchis, Chenyang Li, Hanlei Zhang, Xiaobing Hu, Soumya Sridar, Yuankang Wang, Wei Chen, Wei Xiong |
| Rok vydání: |
2022 |
| Předmět: |
|
| Zdroj: |
Science Advances. 8 |
| ISSN: |
2375-2548 |
| DOI: |
10.1126/sciadv.abo7333 |
| Popis: |
Metastable alloys with transformation-/twinning-induced plasticity (TRIP/TWIP) can overcome the strength-ductility trade-off in structural materials. Originated from the development of traditional alloys, the intrinsic stacking fault energy (ISFE) has been applied to tailor TRIP/TWIP in high-entropy alloys (HEAs) but with limited quantitative success. Here, we demonstrate a strategy for designing metastable HEAs and validate its effectiveness by discovering seven alloys with experimentally observed metastability for TRIP/TWIP. We propose unstable fault energies as the more effective design metric and attribute the deformation mechanism of metastable face-centered cubic alloys to unstable martensite fault energy (UMFE)/unstable twin fault energy (UTFE) rather than ISFE. Among the studied HEAs and steels, the traditional ISFE criterion fails in more than half of the cases, while the UMFE/UTFE criterion accurately predicts the deformation mechanisms in all cases. The UMFE/UTFE criterion provides an effective paradigm for developing metastable alloys with TRIP/TWIP for an enhanced strength-ductility synergy. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
