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Defect-suppressed extrusion of high-purity magnesium: A processing–structure–defect framework for biodegradable implants
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DOI：10.1016/j.jma.2026.102189.png)
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Abstract
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• Processing maps combined with constitutive modelling identified an unusually narrow DRV/DRX-stable processing window in coarse-grained 4 N high-purity Mg, providing a practical guide for stable and defect-suppressed hot extrusion. • Guided by this processing window, extrusion trials verified that stable low-strain rate deformation promotes pore collapse and spheroidization, reducing the maximum defect size to below 60 µm (compared with ∼1–1.6 mm in commercial high-purity Mg rods) and yielding a markedly more homogeneous internal defect structure. • Single-pass extrusion within the identified processing window produced defect controlled 4 N high-purity Mg rods with tensile strengths above 190 MPa and a low in vitro degradation rate of ∼0.2 mm·year−1, demonstrating the feasibility of manufacturing defect-controlled Mg rods with structural and degradation characteristics relevant to biodegradable implant applications.
Keywords:
High-purity magnesium
Hot deformation
Defect control
Biodegradable magnesium
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