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Microstructures and tensile properties of Mg-6Zn-1Y-1Ce alloy extruded in a temperature range between 300 ℃ and 400 ℃ were investigated. The yield strength of the material increased as the extrusion temperature decreased due to grain refinement. The yield strengths and grain sizes of extruded samples met Hall-Petch equation. The microstructure of the alloy extruded at 300 ℃ had a bimodal grain size distribution with an average grain size of 2.7 mm and showed a yield strength of 327 MPa with an elongation of 9%. The fine-grained microstructures were attributed to the dynamic recrystallization and the pinning effect of fine strengthening particles.
Microstructures and tensile properties of Mg-6Zn-1Y-1Ce alloy extruded in a temperature range between 300 ° C and 400 ° C were investigated. The yield strength of the material increased as the extrusion temperature decreased due to grain refinement. The yield strengths and grain sizes of extruded samples with Hall-Petch equation. The microstructure of the alloy extruded at 300 ° C had a bimodal grain size distribution with an average grain size of 2.7 mm and showed a yield strength of 327 MPa with an elongation of 9%. The fine- grained microstructures were attributed to the dynamic recrystallization and the pinning effect of fine strengthening particles.