Some observations on the mechanical properties of a ζ H.C.P. Copper–Germanium phase

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Abstract
This work was undertaken at the kind suggestion of Dr. T. B. Massalski, to whom I am very grateful for help and encouragement. I have also greatly benefited from the comments of Professors R. W. Cahn and P. Haasen and Drs. R. L. Bell, H. W. King and H. S. Rosenbaum on this manuscript. Dr. L. F. Vassamillet made the microprobe analyses and Mr. J. Escajeda assisted in part of the experimental work. This work has been supported in part by the Atomic Energy Commission. A method for growing single crystals of a copper–13·5 at. % germanium alloy and having approximately the ideal axial ratio is described. The only tensile deformation modes found were basal slip, and {10·11} twinning and cleavage. Basal slip occurred with pronounced yield drops at temperatures below 450°C and marked jerky flow was found in the temperature range 170–450°C. No lüders band was observed; basal slip below 450°C occurred in very narrow zones with very high shear strains. The yield phenomena are inferred to be due to a dislocation unlocking process rather than a multiplication process.

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