Effect of hot extrusion temperature on microstructure and properties of 6061 aluminum alloy grid-shaped parts
Taking 6061 aluminum alloy profile as the research object,numerical simulations were conducted at different hot extrusion temperatures to determine its appropriate hot extrusion temperature,and hot extrusion forming was carried out at the appropriate hot extrusion temperature.The effect of hot extrusion temperature on microstructure and properties of 6061 aluminum alloy grid-shaped parts was studied by means of optical microscope,scanning electron microscopy,universal material testing machine and hardness tester,and the optimal hot extrusion temperature was determined.The results show that as the hot extrusion temperature increases,the grid-shaped 6061 aluminum alloy profile first undergoes recrystallization,followed by grain growth,the number of the second phase Mg2Si in the alloy increases,the hardness of the alloy generally shows an increasing trend,and the tensile strength first increases and then slightly decreases.The optimal hot extrusion temperature for the 6061 aluminum alloy grid-shaped parts is 460 ℃,extrusion speed is 6 mm/s,and its tensile strength is 190.4 MPa,hardness is 47.8 HV0.3,and elongation is 11.7％.
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