Study On The Work-hardening Of Magnesium Alloy

Magnesium alloy is the most lightly structural metal material by nowadays. As a kind ofgreen environmental protection material, magnesium alloy in vehicles and electronic products isgetting more and more extensive application, All above due to their high specific strength、specific stiffness, good electromagnetic shielding performance、damping performance、easyrecovery and other characteristics.Work-hardening is the basic problem of plastic deformation to understand hardening ruleand to simulate deformation mechanism during processing about magnesium alloy. This papermainly studied the Work-hardening problem during tensile and compressive deformationprocessing about AZ31magnesium alloy. First studied phase II of work-hardening and thecondition of phase II work-hardening to generate under tensile test of magnesium alloy. Theηis the judgment as to whether or not to appear of second phase hardening criterion which isidentified by yield stress and peak stress by division. The results showed that: the second stageappearance when theη>0.69.The paper also studied the III and stage IV of magnesium alloyabout work-hardening under tensile condition. the results showed that: above two stages aresubjected to Voce laws, namely the work-hardening rate and stress linearly, but thework-hardening rate of phase IV changes is smaller than the phase III in the slope with the stress,and phase IV appeared only when the temperature is below200℃, furthermore the III phasebegin to transform to phase IV only whenσ c=0.94σ p.Finally it studies the work-hardening ofmagnesium alloy under axial compression. the results show that:, work-hardening rate as afunction of strain appears four distinct stages under compression deformation and temperature islower than250℃, this is due to magnesium alloy is easy to form ｛1012｝twins undercompression deformation.