On the Strengthening Mechanism in Neutron Irradiated Copper Single Crystals. I. On Experiments Concerning Strain Rate Changes Critical Comments on the Preceding Paper of T. J. Koppenaal and R. J. Arsenault

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Abstract
Strain rate changes are used for analysing the flow stress of n‐irradiated copper crystals and lead to the following conclusions: a) The “active crystal length”, i. e. the number of simultaneously active slip planes, increases with the strain rate \documentclass{article}\pagestyle{empty}\begin{document}$\dot \gamma $\end{document} , resulting in \documentclass{article}\pagestyle{empty}\begin{document}$\dot \gamma $\end{document} not being proportional to ⋖ (cross‐head speed) [1]. b) The critical shear stress (css) varies with ⋖ more rapidly than is expected from theory [2]. In the preceding paper [3] arguments are advanced against both of these statements. All of these arguments will be invalidated. The proportionality \documentclass{article}\pagestyle{empty}\begin{document}$\dot \gamma $\end{document} ∼ ⋖ is shown to represent a rather special case from an atomic point of view. By far more general is a non‐proportionality \documentclass{article}\pagestyle{empty}\begin{document}$\dot \gamma $\end{document} ≁ ⋖. Taking this into accont one succeeds in describing straightforwardly the results of b). New experiments supporting our former statements are going to be reported. All conclusions drawn previously [4, 5, 6] on the strengthening mechanism in copper and based on a) and b) can be fully maintained [7].

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