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通过在Gleeble-1500D热模拟试验机上进行高温等温压缩试验,对Cu-0.4Zr合金在应变速率为0.001~10 s~(-1)、变形温度为550~900℃、最大变形程度为55%条件下的流变应力行为进行探讨。分析了该合金在高温变形时的流变应力和应变速率及变形温度之间的关系,并对其在热压缩过程中的组织演变进行观察。结果表明:热模拟试验中,应变速率和变形温度的变化强烈地影响合金流变应力的大小,流变应力随变形温度升高而下降,随应变速率提高而增大。结合流变应力、应变速率和变形温度的相关性,计算得出了该合金高温热压缩变形时的应力指数(n)、应力参数(α)、结构因子(A)、热变形激活能(Q)和本构方程。合金动态再结晶的显微组织强烈受到应变速率的影响。
Through the high temperature isothermal compression test on the Gleeble-1500D thermal simulation tester, the Cu-0.4Zr alloy was sintered at a strain rate of 0.001-10 s -1, a deformation temperature of 550-900 ℃ and a maximum deformation degree of 55% Under the flow stress behavior. The relationship between the flow stress, strain rate and deformation temperature of the alloy during high temperature deformation was analyzed. The microstructure evolution of the alloy during hot compression was also observed. The results show that the change of strain rate and deformation temperature strongly influence the flow stress of the alloy in thermal simulation test. The flow stress decreases with the increase of deformation temperature and increases with the increase of strain rate. According to the correlation between flow stress, strain rate and deformation temperature, the stress exponent (n), stress parameter (α), structure factor (A), thermal deformation activation energy ) And constitutive equation. The dynamic recrystallization of the microstructure is strongly influenced by the strain rate.