Analysis of texture and mechanical anisotropy of Al-Mg alloy sheets for autobody applications

Abstract

The effect of texture on mechanical anisotropy was investigated in three commercial Al-Mg alloy sheets for autobody applications. The textures were identified using ODF (oriented distribution function) analyses of XRD pole figures. The volume fractions of existing texture components were calculated based on the Gaussian function approximation. The tensile tests were performed in different directions to the rolling direction of the sheet in order to analyze the mechanical anisotropy. The Cube and Cube_ND recrystallization textures were identified as dominant texture components of the Al-Mg alloy sheets. The experimental R-values were in good agreement with the prediction based on the CMTP (continuum mechanics of textured polycrystals). The mechanical anisotropy originated from Cube_ND texture component was weaker than that originated from Cube texture component. The anisotropy in R-value decreased with increasing the amount of random spread components and the AR value was measured as 0.01 when the random spread component was 70%. The biaxial stretchability obtained from Erichen test was enhanced with decreasing the mechanical anisotropy in Al-Mg alloy sheet.