Raman spectroscopy mapping of amorphized zones beneath static and dynamic Vickers indentations on boron carbide. Issue 5 (May 2017)

• Record Type: Journal Article
• Authors: Parsard, Gregory; Subhash, Ghatu
• Is Part Of: Journal of the European Ceramic Society. Volume 37:Issue 5(2017)
• Page Start: 1945
• Page End: 1953
• Publication Date: 2017-05
• Subjects: Boron carbide -- Raman spectroscopy -- Amorphization -- Indentation; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2016.12.045
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Three-dimensional models of amorphized zones beneath quasistatic and dynamic Vickers indentations on boron carbide were constructed using micro-Raman spectroscopy. The square of amorphized zone depth varied linearly with load and the maximum amorphized area occurred beneath the indentation imprint in accord with the maximum shear stress under Hertzian contact. Reduced measurements of amorphization intensity at loads above 10 N may be due to a loss of subsurface amorphized material through lateral cracks. Utilizing an expanding cavity model with power-law (n = 0.79–0.80) and linear (Ep = 0.39–0.45) strain hardening responses, finite element simulations were conducted to determine the critical values of stress and strain required to cause amorphization. These simulations suggest that amorphization may initiate at von Mises stresses and equivalent plastic strains above 6.6 GPa and 0.026, respectively. These results may be useful for validating computational models of boron carbide under complex loading scenarios (e.g., ballistic impact).