蓝宝石在900至1500°C温度下基底滑移的铬硬化和Peierls机制
Chromium hardening and Peierls mechanism for basal slip in sapphire at temperatures between 900 and 1500 $^\circ$C
AI总结：
本研究通过力学测试和位错滑移模型，揭示了Cr掺杂对蓝宝石在900-1500°C下基底滑移的硬化效应，且屈服应力增量随温度恒定，硬化随Cr浓度增加而增强。
摘要：
研究了四种不同Cr浓度的Cr3+掺杂α-Al2O3（红宝石）在900至1500°C温度范围内的塑性变形。力学测试表明，在未掺杂α-Al2O3中，位错增殖过程以及这些位错滑动速度对施加应变率的调整并未受到Cr浓度的显著影响。屈服应力增量随温度大致保持不变，且硬化程度随Cr浓度增加而增强。临界分解剪切应力（CRSS）被固定在一个基于位错滑移的模型中，该模型由扭折对的形核和传播控制，并经过修改以包含Cr引起的硬化。使用接近未掺杂α-Al2O3所采用的调整参数，获得了令人满意的拟合结果。
英文摘要：
The plastic deformation of Cr3+ -doped a-Al2 O3 (ruby) with four distinct Cr concentrations has been studied at temperatures between 900 and 1500 $^\circ$C. The mechanical tests indicate that the processes of dislocation multiplication and the adjustments of the slip velocity of these dislocations to the imposed strain rate in undoped a-Al2 O3 are not significantly affected by the Cr concentra%on. The yield stress increment is approximately constant with temperature and the hardening increases with the Cr concentration. The critical resolved shear stress (CRSS) is fixed to a model based on dislocation glide controlled by the nucleation and propagation of kink pairs, modified to include the hardening due to Cr. Satisfactory fits are achieved with adjustable parameters close to those employed for undoped a-Al2 O3 .
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