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首页> 外文期刊>Journal of Materials Science >Analysis of observations on solid-solution hardening in KBr-KCl single crystals
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Analysis of observations on solid-solution hardening in KBr-KCl single crystals

机译：KBr-KCl单晶中固溶硬化的观察结果分析

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摘要

Available data on the temperature and concentration dependences of the critical resolved shear stress (CRSS) of KBr-KCl solid-solution crystals containing 8-41 mol% KCl in the temperature range 77-230 K have been analysed within the frame work of the kink-pair nucleation model of plastic flow in solid-solution crystals. It is found that CRSS s decreases with the increase in temperature T in accord with the model relation ln tau = A-BT, where A and B are positive constants. The CRSS tau at a given temperature depends on solute concentration c as tau proportional to c(p), where exponent p has a value between 0.5 and 1 depending on the temperature at which deformation is carried out. The model parameter W-o, i. e. binding energy between the edge-dislocation segment involved in the unit activation process and the solute atoms close to it (T -> 0 K), which is inversely proportional to B, increases with solute concentration c monotonically in accord with the model prediction W-o proportional to c(1/4) upto a critical value c(m) = 35 mol% KCl. However, W-o decreases with increase in c beyond c(m), which indicates somewhat ordered distribution of solute in the host lattice of concentrated solid-solutions with c > c(m).
机译：在扭结的框架内，分析了含有8-41 mol％KCl的KBr-KCl固溶晶体在77-230 K温度范围内的临界分辨剪切应力（CRSS）的温度和浓度依赖性的可用数据固溶体中塑性流动的双对成核模型可以发现，CRSS s随温度T的升高而降低，符合模型关系ln tau = A-BT，其中A和B为正常数。给定温度下的CRSS tau取决于与c（p）成比例的tau溶质浓度c，其中指数p的值在0.5到1之间，具体取决于进行变形的温度。模型参数W-o，即。 e。与单元活化过程有关的边缘位错链段与靠近它的溶质原子之间的结合能（T-> 0 K）与B成反比，与溶质浓度c单调增加，与模型预测的Wo成比例达到c（1/4）至临界值c（m）= 35 mol％KCl。但是，当c超过c（m）时，w-o随c的增加而降低，这表明溶质在c> c（m）的浓固溶体的主晶格中分布有序。

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