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Effect of temperature on the selection of deformation modes in Zircaloy-4

机译：温度对Zircaloy-4变形模式选择的影响

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摘要

The effect of deformation temperature (77, 298 and 573 K) on the evolution of slip and twinning modes in Zircaloy-4 was studied. Samples of Zircaloy-4 were uniaxially compressed to different strains at a nominal strain rate of 10−3s−1. The compression direction was chosen so as to activate twinning. Microstructural examination was carried out using electron backscatter diffraction to relate the evolution of microstructure and texture to the micro-mechanics and work-hardening behaviour. In conjunction with experiments a visco-plastic self-consistent crystal plasticity model was used to determine the evolution of deformation modes. Extensive twinning was observed at all the test temperatures. Twinning activity at 298 and 573 K was comparable, but was lower than that at 77 K. A strong basal texture parallel to the compressive direction was found at 298 and 573 K. The VPSC model predicted well the texture evolution at 298 and 573 K. The basal texture developed at 77 K was found to have partially reoriented back to the initial texture due to secondary twinning. Prism slip was the dominant deformation mode with secondary slip becoming more active at higher temperatures.
机译：研究了变形温度（77、298和573 K）对Zircaloy-4滑移和孪生模式演变的影响。将Zircaloy-4样品以10-3s-1的名义应变率单轴压缩至不同应变。选择压缩方向以激活孪生。使用电子反向散射衍射进行了微结构检查，以将微结构和织构的演变与微力学和加工硬化行为联系起来。结合实验，使用了粘塑性自洽晶体可塑性模型来确定变形模式的演变。在所有测试温度下均观察到广泛的孪晶。 298和573 K处的孪生活性相当，但低于77 K处的孪生活性。在298和573 K处发现了与压缩方向平行的强基础纹理； VPSC模型很好地预测了298和573 K处的纹理演化。由于二次孪生，发现在77 K处形成的基础纹理已部分重新定向回初始纹理。棱镜滑移是主要的变形模式，次级滑移在较高温度下变得更加活跃。

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