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Tailoring twin-induced bimodal heterostructures via moderate rotary swaging for enhanced strain hardening in degradable zinc and its alloys
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DOI：10.1016/j.scriptamat.2026.117381.png)
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Abstract
En 中文
Biodegradable Zn alloys are limited by pronounced strain softening via DRX and GBS, particularly in fine-grained states. Here, we demonstrate that room-temperature high-strain-rate rotary swaging enables reproducible fabrication of twin-induced bimodal heterostructures with superior strain hardening ability. The key lies in controlling cumulative true strain within a moderate range, where twin-dislocation interactions activate synergistic twin-induced and continuous DRX. This produces a unique heterostructure in the central region comprising randomly oriented fine grains and hard-oriented coarse grains, while a macroscopic grain-size gradient from the edge to the center is also introduced due to the spatial heterogeneity. Insufficient strain leads to excessive residual coarse grains compromising strength, while excessive strain triggers full grain refinement and premature softening via GBS. The heterostructured Zn alloy achieves an ultimate tensile strength of 384 MPa and uniform elongation of 6.5%, effectively enhancing strain hardening. This strategy provides a feasible processing route for high-performance Zn alloys.
Keywords:
twin-induced bimodal heterostructures
strain hardening
rotary swaging
degradable zinc alloys
grain refinement
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5.6
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1.6W
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5.1W
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