Hot deformation behavior and hot processing map of Al2O3-Cu/25Cr composite
Al2O3-Cu/25Cr composite was prepared by internal oxidation-rapid hot press sintering method,the thermal deformation test of the composite was carried out using the Gleeble-1500D thermal simulation testing machine(with a deformation temperature of 600-900 ℃and a deformation rate of 0.001-1 s-1),and its true stress-strain curve was plotted.The hot deformation activation energy and constitutive equation of the composite were calculated based on the hyperbolic sine model,and the hot processing map of the Al2O3-Cu/25Cr composite during hot deformation was obtained.The results show that the hot deformation activation energy of the Al2O3-Cu/25Cr composite is 287.227 kJ/mol.Based on the hot processing map,the optimal hot processing parameters for the composite are determined to be deformation temperature of 800-900 ℃ and deformation rate of 0.25-1 s-1.
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