Contact Deformation of Alumina
Joint Authors
Bhattacharya, Manjima
Mukhopadhyay, Anoop Kumar
Source
Issue
Vol. 2012, Issue 2012 (31 Dec. 2012), pp.1-9, 9 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2012-11-14
Country of Publication
Egypt
No. of Pages
9
Main Subjects
Abstract EN
The study of contact-induced deformations during hardness evaluation and the subsequent damage mechanisms of alumina under low loads deserves significant importance for its applications as wear-resistant inserts, biomedical implants, thin films, and armour plates, because the contact-induced brittle failure is an issue of major scientific concern that prevents their widespread commercial applications.
However, the studies on hardness of dense, coarse grain alumina at ultralow load, for example, 1 N, are still lacking.
Therefore, the present study was conducted on a dense (~95% of theoretical) coarse-grain (~20 μm) alumina at a low peak load of 1 N with varying loading rates (10−3–100 N·s−1) applied in depth sensitive indentation experiments.
The results showed profuse presence of multiple micro-pop-in and pop-out events possibly linked to dislocation nucleations underneath the indenter.
The critical resolved shear stress (τCRSS) was found to enhance with the increase in applied loading rates.
The occurrences of the localized shear deformation band formation and microcracking in and around the indentation cavity were explained in terms of the correlation between the nanoscale plasticity events, the small magnitude of (τCRSS), the maximum shear stress (τmax) developed just underneath the indenter, and the dislocation loop radius (Rd).
American Psychological Association (APA)
Bhattacharya, Manjima& Mukhopadhyay, Anoop Kumar. 2012. Contact Deformation of Alumina. ISRN Ceramics،Vol. 2012, no. 2012, pp.1-9.
https://search.emarefa.net/detail/BIM-494994
Modern Language Association (MLA)
Bhattacharya, Manjima& Mukhopadhyay, Anoop Kumar. Contact Deformation of Alumina. ISRN Ceramics No. 2012 (2012), pp.1-9.
https://search.emarefa.net/detail/BIM-494994
American Medical Association (AMA)
Bhattacharya, Manjima& Mukhopadhyay, Anoop Kumar. Contact Deformation of Alumina. ISRN Ceramics. 2012. Vol. 2012, no. 2012, pp.1-9.
https://search.emarefa.net/detail/BIM-494994
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-494994