利用Gleeble-1500D型热模拟试验机对Cu-0.4Zr-0.15Y合金进行高温单次轴向热压缩试验,研究该合金在应变速率范围为0.001～10 s-1,热变形温度为550 ～900℃条件下的热变形行为.通过真应力-真应变数据得出材料的加工硬化率θ,结合lnθ-ε曲线和-a(lnθ)/(e)ε-ε曲线特征,研究Cu-0.4Zr-0.15Y合金热变形过程的再结晶临界条件.结果表明:Cu-0.4Zr-0.15Y合金应力-应变具有动态再结晶特征;该合金的lnθ-ε曲线拐点处对应于-a(lnθ)/(e)ε-ε曲线的最小值,最小值所对应的应变是临界应变εc;临界应变εc的变化与应变速率和变形温度有关,临界应变εc与Zener-Hollomon参数Z之间的函数关系为εc=6.4×10-3Z0.07768,且临界应变εc与峰值应变εp之间满足ε／εp=0.448.同时,Cu-0.4Zr-0.15Y合金发生动态再结晶组织演变与变形温度和应变速率有关.
The high temperature single axial hot compression test of the Cu-0.4Zr-0.15Y alloy was carried out on a Gleeble-1500D thermal simulator.The thermal deformation behavior of the Cu-0.4Zr-0.15Y alloy was studied under the strain rate range of 0.001-10 s-1 and the thermal deformation temperature from 550 ℃ to 900 ℃.Material hardening rate θ of the alloy was obtained by the true stress-true strain data.The recrystallization conditions of the Cu-0.4Zr-0.15Y alloy during hot deformation process were studied according to the curves of lnθ-ε and-(e)(lnθ)/(e)ε-ε.The results indicate that the Cu-0.4Zr-0.15Y alloy exhibits the feature of dynamic recrystallization in the process of the hot compression test.The inflection point of the lnθ-ε curve corresponds to the minimum of the-0(lnθ)/(e)ε-ε curve.The strain corresponding to the minimum value of the-(e)(lnθ)/(e)ε-εcurve is the critical strain (εc) of the Cu-0.4Zr-0.15Y alloy.The change of critical strain is related to strain rate and deformation temperature.The model function relationship between critical strain εc and Zener-Hollomon parameter (Z) is described by the function of e c =6.4 × 10-3 Z0.07768.There is a relationship between the critical strain εc and the peak strain εp,i.e.εc/εp =0.448.The dynamic recrystallization process of the Cu-0.4Zr-0.15Y alloy is related to the deformation temperature and strain rate.
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