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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials >A threshold stress for the superplastic deformation in Y_2O_3-stabilized tetragonal ZrO_2
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A threshold stress for the superplastic deformation in Y_2O_3-stabilized tetragonal ZrO_2

机译：Y_2O_3稳定的四方ZrO_2中超塑性变形的阈值应力

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摘要

The superplastic deformation behavior of Y_2O_3-stabilized tetragonal ZrO_2 exhibits three stress regions in the stress-creep rate relationship. In the high and intermediate stress regions, the stress exponent n varies from ≈2.0 to ≥ 3.0 with decreasing stress. The origin of the increasing n-value can be explained from the existence of a threshold stress, σ_0 that depends on the grain size. In the high and intermediate stress regions, the deformation behavior replotted by effective stress can be characterized by the straight relationship with n n ≈ 2.0, suggesting that the deformation occurs through a single deformation mechanism of grain boundary sliding incorporated with the threshold stress.
机译：Y_2O_3稳定的四方ZrO_2的超塑性变形行为在应力-蠕变速率关系中表现出三个应力区域。在高应力和中等应力区域，应力指数n随应力减小而从≈2.0变为≥3.0。可以根据阈值应力σ_0的存在来解释增加的n值的根源，该阈值取决于晶粒尺寸。在高应力和中等应力区域，由有效应力重绘的变形行为可以通过与n n≈2.0的直线关系来表征，这表明变形是通过结合有阈值应力的晶界滑动的单一变形机制发生的。

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