Effects of grain boundary

second phase and texture on the anisotropy of casting-rolling Al-Mn alloy sheet were analyzed.The results show that the yield strength in direction of 0°

45°

90°relative to the casting-rolling aluminium sheet reaches up to 158.51 MPa

141.78 MPa

164.32 MPa

respectively.Meanwhile

the planar anisotropy index（IPA）of yield strength

tensile strength and elongation are more than 8

which means that the casting-rolling aluminium sheet exhibits anisotropy.The grain in casting-rolling aluminium sheet exhibits elongated grain strip structure

and the primary textures in casting-rolling aluminium sheet include mainly{112}<111> texture and {123}<634> texture.The shape of the second phase size exhibits asymmetrical structure with heterogenerous distribution.The anisotropy of mechanical properties of the alloy is dominated by the grain boundary

second phase and crystallographic texture based on joint action.