Prismatic Slip of A12O3 Single Crystals Below 1000°C in Compression Under Hydrostatic Pressure
Prismatic Slip of A12O3 Single Crystals Below 1000°C in Compression Under Hydrostatic Pressure
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A12O3 单晶在 1000°C 以下静水压压缩下的棱柱滑移
DOI：
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发表时间：
1981
期刊：
影响因子：
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通讯作者：
S. Kirby
中科院分区：
文献类型：
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作者：
J. Castaing;J. Cadoz;S. Kirby
氧化铝单晶在 20° 至 950°C 之间以恒定应变速率垂直于 [0001] 轴压缩。在r>200℃时，500至1500MPa的静水压力抑制了失效。棱柱滑移{1120}<1100>是根据侧面的光学观察和从样品上切下的薄片中的应力光学特征推导出来的。临界分辨剪切应力 (CRSS) 随着温度的升高而迅速下降，在 200°C 时最大为 ∼3000 MPa（应变率 2±10-−5 s−1）。一个简单的线性定律可以与 CRSS 的对数拟合，作为温度的函数，最高可达 1800°C。位错滑移的速率控制机制可能是 Peierls 势垒或由于滑移面解离而产生的势垒。
Alumina single crystals were compressed perpendicular to the [0001] axis at a constant strain rate between 20° and 950°C. At r>200°C, failure was suppressed by_hydrostatic pressures of 500 to 1500 MPa. Prismatic slip {1120}〈1100〉 was deduced from optical observations of the lateral surfaces and from stress-optical features in thin sections cut from the specimens. The critical resolved shear stress (CRSS) decreased rapidly with increasing temperature, from a maximum of ∼3000 MPa at 200°C (strain rate 2±10-−5 s−1). A simple linear law can be fitted with the logarithm of the CRSS as a function of temperature, up to 1800°C. The rate-controlling mechanism for dislocation glide is likely to be either the Peierls barrier or barriers due to dissociation out of the glide plane.