Microstructures and mechanical properties of hot rolled AZ31 Mg alloy sheets
(1.上海市上海交通大学轻合金网成型国家工程研究中心
2.National Engineering Research Center for Light Alloy Net Forming, Shanghai Jiao Tong University,Shanghai 200030, China
3.National Engineering Research Center of Light Alloy Net Forming, Shanghai Jiao Tong University,Shanghai 200030, China)
2.National Engineering Research Center for Light Alloy Net Forming, Shanghai Jiao Tong University,Shanghai 200030, China
3.National Engineering Research Center of Light Alloy Net Forming, Shanghai Jiao Tong University,Shanghai 200030, China)
Abstract: The microstructures and mechanical properties of hot rolled AZ31 Mg alloy sheets were studied to understand the microstructure evolution during AZ31 Mg alloy hot rolling process. The roller was heated to 180 ℃ with burning hydrogen, and the extruded plates were rolled at 400 ℃ from 10 to 1 mm with a reduction of 30% in thickness per pass. The result shows that there is no side-cracking of these rolled sheets every pass. The extruded microstructures are greatly refined and mechanical properties are improved. The fine grains of about 4 μm were obtained of the final 0.9 mm sheets.
Key words: magnesium sheet hot rolling technique; microstructure evolution; grain refinement