Effect of annealing temperatures on the mechanical and wear properties of TU2 oxygen-free copper AITranslate

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Chinese Library Classification Number:TG146.1[一般工业技术—材料科学与工程];TG156.2[金属学及工艺—金属材料]

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In this study,the effects of different annealing temperatures(200,250,300 and 350℃)on the microstructure,mechanical properties and friction and wear properties of TU2 oxygen-free copper were analyzed using OM,SEM/EDS,3D/CLM,tensile testing machine,and friction and wear testing machine.The results show that with an increase in annealing temperature,the grain sizes of copper alloy gradually increased,and the number of annealing twins increased;the wear resistance exhibited a trend of increasing first and then decreasing.TU2 oxygen-free copper exhibited the highest yield strength(295.3 MPa),tensile strength(303 MPa),and the Vickers hardness(94.7 HV)at an annealing temperature of 200℃,demonstrating a superior balance between strength and plasticity.This was primarily attributed to the inhibition of dislocation movement by fine-grain strengthening,dislocation strengthening,and the presence of annealing twin boundaries.Regarding wear resistance,the sample annealed at 250℃ exhibited the best wear resistance,with a wear volume of only 30.73×10^-3 mm³/(N·m),attributed to the retention of an appropriately work-hardened microstructure.Although a stable oxide film formed on the surface of the sample annealed at 350℃(reducing the coefficient of friction to 0.414),its wear volume increased significantly compared to the 250℃ annealed sample.This degradation in performance was mainly due to the insufficient load-bearing capacity of the matrix,which weakened its resistance to ploughing and plastic deformation.