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首页> 外文期刊>Journal of Materials Research >High temperature deformation of vertical gradient freeze method melt-textured Y_IBa_2Cu_3O_7-x.
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High temperature deformation of vertical gradient freeze method melt-textured Y_IBa_2Cu_3O_7-x.

机译：垂直梯度冻结法高温变形Y_IBa_2Cu_3O_7-x的高温变形。

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摘要

The deformation behavior of melt-textured Y_IBa_2Cu_3O_7-xYi (YBCO) prepared by the vertical gradient freeze (VGF) method was investigated by high temperature deformation experiments at temperatures ranging from 850 to 950 deg C. The experiments were performed in an atmosphere of pure oxygen under uniaxial pressure with constant strain rates in the range from 1 X 10~5 to 5 X 10~4 s~-1. An analysis of the dependence of the steady state flow stress on the strain rate and the deformation temperature reveals that the predominant deformation mechanism is dislocation glide and climb controlled by climb at Y-211 particles and that no significant grain boundary sliding occurs. Furthermore, transmission electron microscopy observations of deformed and undeformed samples support a deformation mechanism based on dislocation movement. The total fracture strain, however, does not depend on the temperature or strain rate. Scanning electron microscopy investigations of the fracture faces of samples deformed until fracture reveal that fracture does not occur within the Y-123 matrix but along platelet boundaries. An improvement of the fracture behavior is expected by introducing large Y-211 particles interconnecting neighboring platelets.
机译：在850至950摄氏度的温度下，通过高温变形实验研究了用垂直梯度冷冻（VGF）方法制备的熔融织构Y_IBa_2Cu_3O_7-xYi（YBCO）的变形行为。该实验在纯氧气氛下进行。在单轴压力下，恒定应变率在1 X 10〜5到5 X 10〜4 s〜-1范围内。对稳态流应力对应变率和变形温度的依赖性的分析表明，主要变形机制是位错滑移和爬升受Y-211粒子的爬升控制，并且没有发生明显的晶界滑动。此外，变形和未变形样品的透射电子显微镜观察支持基于位错运动的变形机制。然而，总的断裂应变不取决于温度或应变速率。扫描样品变形面的电子显微镜观察，直到断裂表明断裂不在Y-123基质内发生，而是沿血小板边界发生。通过引入互连相邻血小板的大Y-211颗粒，有望改善骨折行为。

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