Journal
MATERIALS
Volume 12, Issue 15, Pages -Publisher
MDPI
DOI: 10.3390/ma12152437
Keywords
repetitive upsetting extrusion; Mg-Gd-Y-Zn-Zr; microstructure; dynamic recrystallization; texture
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Funding
- Natural Science Foundation of Shanxi Province [201801D121106]
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The effects of repetitive upsetting extrusion under different starting temperatures on the microstructure and texture of GWZK124 alloy were investigated. The results clearly showed that the particles and second phases induced dynamic recrystallization (DRX), which can be explained by the particle-stimulated nucleation (PSN) mechanism. It was shown that grain refinement during repetitive upsetting extrusion (RUE) is dominated by a complicated combination of continuous dynamic recrystallization and discontinuous dynamic recrystallization. The RUEed alloys under different starting temperatures exhibited a bimodal microstructure comprising fine DRXed grains with weak texture and coarse deformed grains with strong texture. The DRXed grains could weaken the texture. As the RUE starting temperature decreased, the average grain size increased and the volume fraction of DRXed grains decreased.
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