Hot deformation behavior of dispersion copper/35Cr electrical contact composite
Al2O3-Cu/35Cr composite was prepared by the combination process of fast hot-press sintering and internal oxidation.The composite was isothermally compressed using Gleeble-1500D testing machine under the experimental conditions of the deformation temperature and strain rate set at 650-950 ℃ and 0.001-1 s-1,respectively,and their true stress-true strain curves were plotted to analyze the effects of the two test parameters on the flow stress.Meanwhile,the constitutive equation and hot processing map of the composite were constructed to analyze their hot processing parameters.The results show that the Cr particles of the composite are uniformly distributed on the nano γ-Al2O3 dispersion-strengthened Cu matrix,and the sintered density,conductivity and microhardness are 98.9%,44.4%IACS and 145HV,respectively.The Al2O3-Cu/35Cr composite has thermal sensitivity and positive strain rate correlation.And the optimum deformation temperature and strain rate parameters at deformations of 0.3 to 0.5 are in the intervals of 650 to 680℃,0.55 to 1 s-1 and 810 to 950℃,0.007 to 0.123 s-1.
万方数据
维普
