A strategy for enhancing the mechanical property of the precipitation-strengthened medium-entropy alloy
| Autor: | Daixiu Wei, Hai Long Yi, Ren Yi Xie, Yi Fan Zhang, Hidemi Kato |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Mechanical property Pre straining Materials science Annealing (metallurgy) Precipitation (chemistry) Mechanical Engineering Alloy technology industry and agriculture 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Entropy (classical thermodynamics) Mechanics of Materials 0103 physical sciences Ultimate tensile strength engineering General Materials Science Composite material 0210 nano-technology Grain structure |
| Zdroj: | Materials Science and Engineering: A. 819:141390 |
| ISSN: | 0921-5093 |
| DOI: | 10.1016/j.msea.2021.141390 |
| Popis: | Medium-entropy alloys strengthened by the L12-type coherent precipitates were recently proposed, whereas the mechanical property still needs to be improved. Here, we demonstrated a strategy for notably improving the strength of the representative (CoCrNi)94Ti3Al3 alloy, in which the refinement of grain structures and the promotion of precipitation were concurrently achieved by pre-strain followed by aging. A refined grain structure containing incoherent σ-precipitates and a large number of coherent L12-precipitates was formed, which enhances the yield strength and ultimate tensile strength up to 1431 MPa and 1683 MPa respectively. Furthermore, decreasing pre-strain temperature or increasing strain further aids the enhancement. The present study opens an avenue for fabricating high-performance precipitation-strengthened alloys. |
| Databáze: | OpenAIRE |
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