Excellent strength and ductility of heterogeneous grain structures high-entropy alloys via salt bath flash annealing
Source abstract
Abstract
The yield strength of FCC high-entropy alloys is low, which seriously restricts its application. In order to significantly improve the strength while without significantly sacrificing ductility, a new and efficient processing strategy was adopted in this study, including two-stage thermomechanical processing and flash annealing. Based on this, a heterogeneous grain structure high-entropy alloys composed of recrystallized coarse grains, recrystallized fine grains and residual deformed grains was prepared. The complex structure formed by flash annealing has a good strength-plastic synergistic effect. The results show that with the increase of annealing time, the phase structure of the alloy always maintains a single-phase FCC structure. When the annealing time is 10 s, the yield strength and uniform elongation are 950.8 MPa and 13.9 %, respectively. Especially when the annealing time is 15 s, the yield strength is still maintained at 835.5 MPa, and the uniform elongation is greater than 20 %. The high yield strength is not only due to the strengthening caused by high density dislocations, but also due to the back stress hardening caused by the combination of hard and soft domains. The excellent combination of strength and plasticity is the combined effect of heterogeneous deformation induced strengthening and strain hardening, deformation twins and stacking faults.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: High Entropy Alloys Studies · Magnesium Alloys: Properties and Applications · High-Temperature Coating Behaviors
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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