Influence of Texture on Hall-Petch Slope in Hot-extruded AZ31 Magnesium Alloys

Abstract

To study the influence of texture on Hall-Petch slope, the Hall-Petch relationships of two hot-extruded AZ31 alloys (A117 and A189) were determined by the measurement of yield strength at room temperature. To determine the real texture difference, the texture changes were facilitated by the variation of extrusion ratio and demonstrated by the actual grain orientation distributions. The A117 alloys exhibited higher Hall-Petch slope in comparison of A187 in the condition of tension and compression, because A117 alloys had lower volume fraction of grains in the range of basal pole 75°–90°. The Hall-Petch slope differences for both alloys were analyzed and discussed by boundary obstacle against deformation propagation in grains with various orientation. Due to the higher volume fraction of grains in the range of basal pole 75°–90° in A189, the effect of hindering dislocation slip or twinning propagation by grains boundary was weaker than of A117.

Keywords

Hall-Petch relationship / AZ31 / texture

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