A superplastic micro-extrusion technology to develop engineered magnesium micro-components




A novel superplastic micro-extrusion (SME) technology has been developed to manufacture high-strength, lightweight magnesium micro-components, specifically addressing the challenges of limited room-temperature formability in magnesium alloys. This technology utilizes microstructural engineering to enable large plastic deformations at the microscale, resulting in miniaturized parts like micro-pins and micro-cups with homogeneous mechanical properties.

Key Features of the SME TechnologyMicrostructural Engineering: The process starts by engineering an ultrafine grained (UFG) microstructure in Mg-RE (Rare Earth) alloys using Friction Stir Processing (FSP). This produces equiaxed grains (typically <1 µm) with thermally stable intermetallic phases (

) that pinning grain boundaries.
Dual-Mode Extrusion: The technology supports both Micro-Forward Extrusion (MFE) to create pins and Micro-Backward Extrusion (MBE) for cup-like structures.
Governing Mechanism: The primary deformation mechanism is Grain Boundary Sliding (GBS), which allows the material to flow into complex micro-tool geometries without the "size effect" issues typical of traditional slip-based deformation.
Isothermal Conditions: A custom-designed press tool with integrated induction heating maintains near-isothermal conditions, ensuring dimensional accuracy and repeatability.

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