Research On Microstructure And Mechanical Properties Of AZ31Magnesium Alloy By Asymmetrical Rolling

Using asymmetrical rolling technology to produce Magnesium alloy sheets doesnot only have the advantages of low energy consumption, low rolling force, highprecision of products, but also can improve plastic forming performance of rollingsheets. In this research, both numerical simulations and experiments have been done toresearch the asymmetrical rolling process of magnesium alloy sheet, microstructureevolution of magnesium sheet during deformation and the sheet mechanical properties.The main content is as follows:(1) FEM software MSC.MARC is used to simulate the AZ31magnesium alloy sheetrolling process. From simulation results, analyzed the influence of parameters inasymmetrical rolling process on equivalent strain of sheet during rolling process,obtained appropriate theoretic friction coefficient and different speed ratio. Theappropriate theoretic friction coefficient is0.3and the different speed ratio is1:1.44.(2) According to the simulation results, drawing the pole figure of rolling sheet byusing MATLAB software and analyzing the texture evolution of sheet underdifferent rolling reduction. The result is that with the increase of reduction, basaltexture intensity will decline and then climb up.(3) The pole figures of magnesium sheet from asymmetrical rolling in laboratorywere drew by using X-ray diffraction data. Comparing with the simulation polefigure with same deformation strain, the trends of texture changing keeps almostsame.(4) Discussed the influence of total reduction, speed ratio, and temperature inasymmetrical rolling process on microstructure of AZ31magnesium alloy sheets.Explained the reason why basal textures intensity of rolling sheets change with the increase of reductions by analyzing the metallographic organizations and XRDpole figures of magnesium alloy sheets from normal rolling and asymmetricalrolling under different rolling reduction.(5) Discussed the influence of total reduction, speed ratio, and temperature onmechanical properties of AZ31in asymmetrical rolling process magnesium alloysheets. Magnesium alloy rolling sheets has a huge different shape of compressionstress-strain curve under different compression direction. According to themicrostructure and deformation mechanism of magnesium alloy, analyzed thereason of compressive anisotropic phenomena of magnesium alloy rolling sheets.