Abstract
Direct extrusions of commercial casting AZ31 alloy were carried out at elevated temperatures with different extrusion velocities. Microstructure and texture distribution of extruded rods were investigated with optical microscopy (OM) and electron backscattered diffraction (EBSD). Tensile tests were conducted at room temperature using samples from both casting billets and extruded rods. The experimental yield strength can not be solely described by average grain size. In this paper, the grain size and orientation in the extruded samples were characterized by EBSD, and Hall-Petch equation was applied to each individual grain with the input from EBSD results (individual grain size and orientation). The yield strength of tensile sample (polycrystalline aggregate) and individual grain was related by Taylor assumption. The predicted yield strength showed the same trend as experiment results.KeywordsMagnesium alloy AZ31ExtrusionMicrostructureTextureYield strength
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