Methods for improving mechanical property and biological stability of magnesium alloy and manufacturing material and applications

A heat treatment method for improving the mechanical property and the biofunctional stability of a magnesium alloy, comprising steps of:

• (1) fully annealing an original cold-drawn magnesium alloy AZ31 in an interference-free atmosphere;
• (2) polishing a surface of the magnesium alloy AZ31 from the step (1) by a waterproof abrasive paper to remove an original oxide layer while maintaining or improving the finish of the surface;
• (3) heating the magnesium alloy AZ31 obtained from the step (2) in an interference-free atmosphere created by an inert gas or a vacuum, wherein the magnesium alloy AZ31 is heated to a temperature of 330° C. to 350° C. in the interference-free atmosphere and then the temperature is kept for 3 to 4 hours;
• (4) cooling the magnesium alloy AZ31 obtained from the step (3) to room temperature, to obtain an equiaxed crystal structure which is texture-even and isotropic.