A Study on Microstructure and Mechanical Properties of AZ31 Magnesium Alloy after Constrained Groove Pressing

摘要

This study the AZ31 magnesium alloy trips of the dimension 60×60×3 mm was used for constrained groove pressing(CGP)after 4 cycles under elevated temperature condition.Microstructure and mechanical properties were analyzed for a material with ultra-fine grained structure prepared by CGP of AZ31 magnesium alloy.Analysis of the scanning electron microscope(SEM)micrographs observations showed significant drop of the grain size from(50 ÷ 60)μm to(4 ÷ 6)μm after four CGP cycles.The minimal grain size of(1÷1.5)μm was detected in the regions of the highest deformation.Moreover,the tensile test along the x and z directions showed excellent high strength(325 MPa)and also plastic elongation of 35 %.It is shown that the CGP technique is a good tool for the grain refinement and improving mechanical properties of magnesium alloys.