Abstract
This paper aims to investigate the initiation and distribution of dislocations and twins in the subsurface of alumina subjected to single-point scratching and to gain a deeper understanding of the mechanisms of ductile-regime grinding of alumina. It found that there generally exist three regions of dislocation and twin systems in the scratched alumina. The first region contains five independent slip systems so that macroscopic plastic flow is possible there. In the second and third regions, not all the systems can be activated, and then microcracking in the subsurface may occur easily. The distribution of these regions varies with the grain size of alumina. In the 25 μm-grained alumina all three regions appear. Thus, in this case, microcracking is difficult to avoid. In the 1 μm-grained alumina, however, only the first region appears, indicating that the material may be scratched under a real ductile mode without microcracking. A comparison shows that theoretical predictions are in good agreement with experimental observations.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: 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.