Transmission electron microscopy on nickel oxide single crystals deformed at room temperature

Transmission electron microscopy was performed on nickel oxide single crystals deformed under compression along the [0 0 1] direction, at room temperature. Foils for observation were obtained by mechanical thinning followed by ion beam thinning. The glide system and the Burgers vectors of dislocations were found to be the same as those of MgO and NaCl. For the origin of high rate work hardening, the intersection of glissile dislocations with other inactive dislocations followed by dipole formation, and edge dipole formation which serves as a strong barrier against active slip dislocations, were confirmed. The second stage of work hardening begins with the operation of an oblique second system.On leave of absence from the Department of Natural Science, Osaka Women's University, Daisen-cho, Sakai City, Osaka 590.