|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Advanced Characterization Techniques for Quantifying and Modeling Deformation Mechanisms
||Investigating the On-set of Amorphization in Single Crystal Boron Carbide
||Jonathan Ligda, Jeffrey Lloyd, Brian Schuster
|On-Site Speaker (Planned)
Amorphization of boron carbide under contact loading has been observed and reported on in multiple studies that subjected the ceramic to extreme stress states. Previously, nanoindentation with sharp indenter tips was used and the degree of amorphization was identified afterward. These sharp tips created complex stress fields in the ceramic, resulting in amorphization at all contact loads. In this work, the amorphization in single crystal boron carbide is impeded by performing nanoindentation with a spherical tip. This tip geometry creates a well-defined transition from elastic to in-elastic deformation in the ceramic, and by performing tests at different maximum loads the initiation of amorphization is controlled. The degree and location of amorphous bands under the indents are characterized by Raman spectroscopy and transmission electron microscopy. These results, combined with finite element modeling of an indent are used to determine the stress state and magnitude needed to initiate amorphization.
||Planned: Supplemental Proceedings volume