TEMPERATURE-DEPENDENCE OF THE EFFECTIVE STRESS FOR KCL SINGLE-CRYSTALS

The authors have proposed a method which is based on the Blaha effect which is the phenomenon that the flow stress decreases by superposition of an ultrasonic oscillatory stress during plastic deformation. Using the new method they separated the effective stress from the applied one for KCl crystals. The ratio of the effective stress to the applied one at 77 K is larger than that at higher temperatures. This leads to a difference between the temperature dependences of m* and m. The value of m at room temperature is so large that the error becomes very large if I. Gupta and J. C. M. Li's method is applied. This is the reason why the authors failed to obtain a reasonable value of m* at room temperature in a previous paper.