Damage resistance, R-curve behavior and toughening mechanisms of ZrB2-based composites with SiC whiskers and ZrO2 fibers. Issue 2 (March 2015)

• Record Type: Journal Article
• Authors: Lin, Jia; Huang, Yu; Zhang, Houan
• Is Part Of: Ceramics international. Volume 41:Issue 2(2015)Part B
• Page Start: 2690
• Page End: 2698
• Publication Date: 2015-03
• Subjects: A. Hot pressing -- B. Composites -- C. Fracture; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2014.10.083
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The damage tolerance and R -curve behavior of ZrB2 -based composites with SiC whiskers and ZrO2 fibers were investigated by using the envelope method. Obvious R -curve behavior was further observed in these composites, as a result of the combined effect of whisker toughening and transformation toughening. The SiC whiskers with high aspect ratio exhausted more fracture energy by deflection, bridging and pull-out during failure, and promoted the transformation toughening of ZrO2 fibers. It was found that these interactions produced a notable increase in toughness to 8.2 MPa m 1/2 . The relatively contribution of each toughening mechanism was estimated. This calculated value was in good agreement with the experimental results (8.0±0.5 MPa m 1/2 ) and the predictions of R -curve behavior (8.026 MPa m 1/2 ).