Flow stress, vickers hardness, and wing size for pure and doped KCl and for KCl:KBr mixed crystals

Abstract

Intercomparisons between flow stress, microhardness, and rosette sizemeasurements for purified KCl single crystals, KCl:Ca, KCl:Sr, and KClxKBr1−x mixed single crystals are made. A good correlation between the flow stress and inverse of the length ofthe dislocation rosette size was found for this crystal system. These results, along with the results of other investigators [1 to 3] show that once a rosette size versus flow stress calibration has been made for a particular crystal system, the rosette size becomes a useful, simple, nearly nondestructive technique for determining the flow stress of a crystal.

Microhardness of aged NiO single crystal

“…The dependance of the inverse of slip band length (ISB) with ageing time has been plotted in figures 3 and 4. ISB length is often correlated with flow stress [3,4,5]. Ageing at 550 OC leads to a large change in ISB ; there is no change in ISB after 850 OC ageing although microhardness behaves similary at the two temperatures.…”