Abstract
Cadmium single crystals were stretched in the ⟨1120⟩ direction to investigate the deformation behavior by non-basal slip. The ranges of testing temperature and strain rate were from 77 to 293 K and from 10−3 to 10−5/s, respectively. The results obtained are as follows: {11\bar22}⟨\bar1\bar123⟩ slips (SPCS) were observed just after yielding at all temperatures and strain rates. In the range from 77 to 133 K, the yield stress decreased with increasing temperature, while the stress increased with increasing temperature in the range from 133 to 293 K. The stress increased by a few MPa at all temperatures when strain rate was increased by a factor of a hundred. The mode of deformation due to SPCS was investigated by the etch pit technique and observations of slip bands. A bundle of slip bands (BSB) into which slip bands were clustered, appeared as an etch pit band (EPB). The slip bands became finer and shorter with increasing temperature. BSB and EPB increased in width continuously with increasing temperature and covered the whole specimen surface at 293 K even just after yielding. The dislocation density in EPB did not change with temperature, strain and strain rate, while the mean moving distance of edge dislocation decreased exponetially with increasing temperature. Furthermore, the shear strain in EPB and BSB decreased rapidly with increasing temperature but did not change with applied strain. The above results suggests that the deformation mode is similar to Lüders deformation.
