The Effect of Rolling Rates on the Texture Development of Polycrystalline Copper

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Abstract

The effect of rolling rates on the texture development of polycrystalline copper has been studied by means of X-ray and reflection electron diffraction techniques. Copper polycrystals with nearly random initial orientations were rolled under low and high speeds; 0.01 and 100 m/min. The following results were obtained:<BR>Below the reduction about 75%, the effect of rolling rate on the textures could hardly be observed and the intermediate type textures were developed.<BR>Above about 75% reduction, the difference of the rolling rates was clearly reflected on the textures. The development of the ideal orientations of {211}⟨\bar111⟩ and {513}⟨\bar121⟩ were retarded during the high-speed rolling.<BR>Although the {111} pole figures at the 94% reduction were characterized by the pure metal type texture at both rolling speeds, the analysis of the texture parameters showed that the rolling texture developed under the high-speed rolling was transformed to the alloy type by about 40%.<BR>It may be considered that the decrease of the crystallites having ideal orientations of {211}⟨\bar111⟩ and {513}⟨\bar121⟩ in the high-speed rolling was caused by mechanical twinning and a lowering of the thermal activation for deformation.

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