Some Observations on Creep in Zinc Single Crystals

Publisher Website
Google Scholar
Abstract
A concentrated load, applied to the surface of a Zn single crystal, produces a hexagonal dimple if this surface is parallel to the basal plane of the crystal lattice. The rim of these dimples is formed by six sets of edge dislocations moving into the six slip directions with increasing loading time, thus causing the dimple to grow. The dimple contours can be photographed with a microfocus x‐ray tube. Measurements of a large number of dimples showed: (1) For a given loading time, dimple size increases linearly with the applied load. (2) For a given load, dimple size increases with loading time until the shear stress at the dimple rim has been lowered to a value characteristic for the material used, below which creep velocity is either zero or extremely low. (3) This critical shear stress is independent of temperature. (4) It depends on the impurity concentration of the crystal in the way predicted by the model of Cottrell.

This publication has 3 references indexed in Scilit: