Revealing the recrystallization behavior and LPSO phase transformation mechanism in Mg-Gd-Y-Zn-Zr alloy induced by electropulsing under hot deformation
Electropulsing treatment of rare-earth magnesium alloy wire can effectively improve its hot workability, offering a new approach to overcome the challenges of poor plasticity and difficult deformation in wires. In this study, hot compression tests were conducted on as-extruded and electropulsing tre...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-08-01
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| Series: | Materials & Design |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127525007774 |
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| Summary: | Electropulsing treatment of rare-earth magnesium alloy wire can effectively improve its hot workability, offering a new approach to overcome the challenges of poor plasticity and difficult deformation in wires. In this study, hot compression tests were conducted on as-extruded and electropulsing treatment Mg-Gd-Y-Zn-Zr alloy wires at different strain rates and temperatures. It was found that, compared with the processing temperature range (ε̇=0.01-0.1s-1, T=375-425°C) of the as-extruded wire, the electropulsing treatment increased the suitable hot-working temperature range of the wire to ε̇=0.01-1s-1, T=360-425°C. Generally, a higher recrystallization content improved the hot workability. However, the electropulsing treatment wire showed higher dislocation density and lower recrystallization content compared to the as-extruded wire. This effect was mainly attributed to the intragranular 14H LPSO phase. The 14H LPSO phase inhibited dislocation movement, leading to delayed dynamic recrystallization. Although the average grain size was larger than that of the as-extruded wire, the grain distribution became more uniform under electropulsing treatment, thereby expanding the wire’s processing zone. The as-extruded wire exhibited poorer machinability because of its large deformed grains. The regulation of grain size and the distribution of LPSO phase is the key to improve the plastic deformation of the wire. |
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| ISSN: | 0264-1275 |