Abstract
Single and polycrystalline samples of magnesium oxide have been doped with calcium and zirconium oxides and heat-treated to produce grown-in whiskers of calcium zirconate or stabilised zirconia. The directions of growth of the whiskers are those in which the misfit between matrix and whisker along the whisker axis is small. Examination of cleaved surfaces indicates that the principal effect of the whiskers on crack propagation occurs when the crack velocity has fallen below the critical value for plastic relaxation at the crack tip. Cleavage and slip steps are then produced at the points of intersection of the crack front with whiskers but the energy absorbed by this process appears small compared to the energy dissipated when a crack traverses a grain boundary.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
