Journal
ACTA METALLURGICA SINICA-ENGLISH LETTERS
Volume 34, Issue 11, Pages 1527-1536Publisher
CHINESE ACAD SCIENCES, INST METAL RESEARCH
DOI: 10.1007/s40195-021-01251-z
Keywords
High-entropy alloy; Hot deformation; Annealing; Microstructure; Recrystallization
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Funding
- Natural Science Foundation of China [51774240]
- Natural Science Foundation of Chongqing, China [cstc2020jcyj-msxmX0976]
- Innovation Capability Support Program of Shaanxi [2020KJXX-073]
- Fundamental Research Funds for the Central Universities
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The study found that hot deformation and heat treatment can alter the microstructure and hardness of high-entropy alloys, with high deformation temperature inducing dynamic recrystallization. Partial and complete recrystallization can occur after annealing, with a decrease in hardness related to the processes of dynamic recrystallization and recovery.
The influence of simple thermomechanical processing such as hot deformation and heat treatment on the microstructure and hardness of an Al0.3CoCrFeNi high-entropy alloy has been investigated. Results show that the relatively high deformation temperature can induce discontinuous dynamic recrystallization with fine grains initially nucleating at the elongated grain boundaries. The transition from partial recrystallization to fully recrystallization, as well as the precipitation behavior after annealing, has been described in detail. Both bcc precipitation and completely recrystallized grains can be observed after annealing at 1000 degrees C. Based on detailed microstructure analysis, the decrease in hardness value is shown to be related to both dynamic recrystallization and dynamic recovery which lead to softening.
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