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This paper demonstrates the effect of the extrusion ratio on the mechanical properties of the as-forged Mg-8Al-0.5Zn alloy. Three extruded Mg bars with the extrusion ratio of 9:1, 16:1, and 25:1 are prepared in the same extrusion condition, which are applied to the warm forging test to obtain the different microstructure with respect to the degree of extrusion effect in Mg alloys. The extrusion ratio over 16:1 has little effect on the mechanical properties of the as-extruded bars since the average grain size and amount of precipitates hardly change. The forgeability of the highly extruded bar is improved around flange area while the mechanical properties are slightly enhanced. The rod-type and particle-type precipitates tend to be favored in the as-forged microstructure with the extrusion ratio over 16:1.

international journal of precision engineering and manufacturing. green engineering/international journal of precision engineering and manufacturing green technology

Effect of the extrusion ratio on the mechanical properties of as-forged Mg-8Al-0.5Zn alloy