Basal slip in Mg3Cd

Publisher Website
Google Scholar
Abstract
The critical resolved shear stress (C.R.S.S.) for basal slip in single crystals of Mg3Cd has been determined as a function of temperature between 77°K and 500°K. From 77°K to 293°K the crystals were tested in either the ordered or the disordered condition depending upon the prior heat treatment. From 293°K to 500°K the state of order was that in equilibrium at the testing temperature, varying from complete order at the lower temperatures to complete disorder at the higher temperatures. The strain–rate sensitivity of the C.R.S.S. was determined using stress-relaxation tests. The C.R.S.S. of the disordered material between 150°K and 293°K is ascribed to short-range order hardening; the greater C.R.S.S. of the ordered material in the same temperature range is attributed to the immobilization of the screw components of superlattice dislocations by cross-slip onto prism planes. Above 293°K the form of the C.R.S.S. versus temperature curve is attributed to a form of Sumino hardening.