Low-temperature plasticity and flow-stress behaviour of strontium titanate single crystals
Low-temperature plasticity and flow-stress behaviour of strontium titanate single crystals
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DOI：
10.1016/j.actamat.2006.05.046
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发表时间：
2006-11-01
期刊：
影响因子：
9.4
通讯作者：
Brunner, Dieter
中科院分区：
文献类型：
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作者：
Brunner, Dieter
采用压缩轴平行于（001）的样品进行压缩试验，研究了单晶钛酸锶在室温下的塑性。在低至 43 K 的温度下观察到可变形性。由应力应变 c-irves 导出的临界分辨剪切应力 (CRSS) 随着温度的降低以非单调方式增加。这种增加的特征是具有不同 CRSS 温度依赖性的三个区域，并在大约 210 K 处显示出显着的一步。应用于透明样品的偏振光显微镜显示，(110){110} 滑移系统在整个温度区域中占主导地位。使用应力松弛实验研究了政权行为，该实验为直接解释现象提供了有希望的证据，因为不同的位错核心和位错运动模式可能是造成三政权行为的原因。 (c) 2006 Acta Materialia, Inc. 由 Elsevier Ltd 出版。保留所有权利。
The plasticity of single-crystalline strontium titanate below ambient temperature was studied by means of compression tests using samples with compression axis parallel to (001). Deformability was observed down to 43 K. The critical resolved shear stress (CRSS) derived from the stress-strain c-irves increases in a non-monotonic manner with decreasing temperature. This increase is characterized by three regimes with different temperature dependences of the CRSS and shows a remarkable step at about 210 K. Polarized light microscopy applied to transparmt specimens revealed that (110){110} slip systems are dominant throughout the whole temperature regime. The regime behaviour is studied using stress relaxation experiments which provide promising evidence for a straightforward interpretation of the phenomera on the basis that different dislocation cores and dislocation motion modes may be responsible for the three-regime behaviour. (c) 2006 Acta Materialia, Inc. Published by Elsevier Ltd. All rights reserved.