Patent ID: 8906293
Filing Date: 2014-12-09
Classification: C22C,C22F

Abstract:
1. A magnesium alloy mainly comprising magnesium, wherein the magnesium alloy comprises crystal grains having a crystal grain structure, wherein repetitive shear strain is introduced into the magnesium alloy by rolling the magnesium alloy with grooved rolls consisting of an upper roll and a lower roll disposed opposite to the upper roll, wherein the crystal grain structure has a high angle grain boundary, wherein an inside of a crystal grain surrounded by the high angle grain boundary is composed of subgrains, wherein grooves of the grooved rolls have a triangular or the like cross-section configuration and diamond-like holes, hexagonal holes or oval holes are formed when the upper and the lower rolls are kept in contact with each other, and wherein tensile yield stress (A), compressive yield stress (B) and yield stress anisotropy ratio (B/A) of the magnesium alloy are at least 300 MPa, at least 220 MPa and at least 0.7, respectively.