Influence of solution treatment temperature on microstructure and properties of 6016 aluminum alloy for automobiles
Influence of solution treatment temperature(530-580 ℃)on microstructure,mechanical properties and tensile fracture morphology of 6016 aluminum alloy cold-rolled sheet for automobiles was studied by means of optical microscope,scanning electron microscopy,energy dispersive spectrometer and electronic universal testing machine.The results show that the strength and elongation of the alloy first increase and then decrease with the increase of solution treatment temperature.The fracture mechanism of the alloy after solution treatment at different temperatures is ductile fracture.The alloy exhibits the best mechanical properties after solution treatment at 550 ℃ for 30 min and artificial aging,and its yield strength,tensile strength and elongation are 230.2 MPa,286.8 MPa and 12.9％,respectively.This is mainly attributed to the more complete dissolution of solute atoms such as Mg and Si in the alloy matrix,the formation of fine and unburned second phases such as AlFeSi,and the precipitation of more precipitation strengthening phases after aging.
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