Enhanced mechanical performance of grain boundary precipitation-hardened high-entropy alloys via a phase transformation at grain boundaries
| Autor: | Hongxiang Zong, L. Zhao, Hailong Zhang, Yongliang Qi, Langchong He, Yake Wu, Fencheng Liu, Xiangdong Ding, Shenbao Jin, Feng Jiang, Sun Jinru, Xiaoming Sun, Gang Sha |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Polymers and Plastics Precipitation (chemistry) Mechanical Engineering High entropy alloys Metals and Alloys 02 engineering and technology Plasticity 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Precipitation hardening Mechanics of Materials Phase (matter) Materials Chemistry Ceramics and Composites Grain boundary Composite material 0210 nano-technology Ductility Stress concentration |
| Zdroj: | Journal of Materials Science & Technology. 86:271-284 |
| ISSN: | 1005-0302 |
| Popis: | Grain-boundary (GB) precipitation has a significant adverse effect on plasticity of alloys, which easily leads to catastrophic intergranular failure in safety-critical applications under high external loading. Herein, we report a novel strategy that uses the local stress concentration induced by GB precipitates as a driving force to trigger phase transformation of preset non-equiatomic high-entropy solid-solution phase at GBs. This in situ deformation-induced phase transformation at GBs introduces a well-known effect: transformation-induced plasticity (TRIP), which enables an exceptional elongation to fracture (above 38 %) at a high strength (above 1.5 GPa) in a GB precipitation-hardened high-entropy alloy (HEA). The present strategy in terms of “local stress concentration-induced phase transformations at GBs” may provide a fundamental approach by taking advantage of (rather than avoiding) the GB precipitation to gain a superior combination of high strength and high ductility in HEAs. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect