Temperature Dependence of Plastic Deformation in White Tin Single Crystals

Abstract

Tensile experiments have been carried out over a wide range of temperatures on single crystals of high-purity white tin with low dislocation density. From the observations of slip lines it is found that different slip systems are activated for different temperature regions and for different orientations of specimens. By deformation with the (100)[010] slip system the cell structure is formed in the specimen. The critical-resolved shear stress of this system shows a similar temperature dependence to that of cubic metals. In the case of the (11̄0)½[111] slip system, only isolated dislocations are formed during deformation and the yield point phenomenon occurs. The critical-resolved shear stress of this system shows a strong temperature dependence not found in cubic metals. It increases nearly exponentially with decreasing temperature and attains a factor of 200.