采用放电等离子烧结(简称SPS)技术制备出Cu-10Cr复合材料,利用Gleeble-1500D热模拟试验机,对制备所得复合材料进行高温等温热压缩试验,变形温度为850℃和900℃、应变速率为0.001～1 s-1、真应变量为0.55.结果表明:Cu-10Cr复合材料的流变应力随温度的升高和变形速率的降低而减小,具有典型的动态再结晶特征;利用流变应力、应变速率和变形温度的相关性,计算得出了该复合材料高温变形时应力指数n、应力参数α和结构因子A等参数,求得其热变形激活能Q并构建了流变应力本构方程.
The Cu-10Cr composite was prepared by spark plasma sintering (SPS).The flow stress behavior of the Cu-10Cr composite during hot compression at 850 ℃ and 900 ℃ with strain rate from 0.001 s-1 to 1 s-1 under maximum strain of 0.55 was investigated by the isothermal compression test on a Gleeble-1500D thermal-mechanical simulator.The results show that,the flow stress of the Cu-10Cr composite decreases with the increasing deforming temperature and the decreasing strain rate.It also shows that the composite has the typical dynamic recrystallization characteristic.The parameters,such as stress index n,stress scale parameter α,and structural factor A are derived from the correlativity of flow stress,strain rate and deforming temperature.At last,the hot deformation activation energy Q is calculated and then the constitutive equation is set up.
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