Achieving exceptional high strain rate superplasticity in an Al0.5CoCrFeNiCu high entropy alloy via multiple grain refinement mechanism
Source abstract
Abstract
An ultrafine-grained Al 0.5 CoCrFeNiCu HEA sheet with an average grain size of 1.2μm was produced by thermo-mechanical processing. The alloy exhibited remarkable HSRS, achieving an elongation of 1120 % at 1050 °C and 0.02 s -1 . During HSRS deformation, the alloy exhibited a high strain rate sensitivity (m-value), thereby maintaining homogeneous deformation. Microstructural evolution analysis revealed that grain boundary sliding was facilitated by the maintenance of a fine-grained structure, enabled by distinct grain refinement mechanisms operating at different stages. These involved continuous dynamic recrystallization in the initial stage and twin-induced grain refinement in the middle-to-later stages. Although their formation mechanisms differ, both contribute synergistically to grain refinement. This work shows a significant achievement in HSRS of HEA.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: High Entropy Alloys Studies · Microstructure and mechanical properties · Additive Manufacturing Materials and Processes
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (44)
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