|About this Abstract
||MS&T23: Materials Science & Technology
||Late News Poster Session
||F-16: Deformation and Fracture Response of Single-crystal MAX Phases
||Milos Dujovic, Miladin Radovic, Ankit Srivastava, Thierry Ouisse
|On-Site Speaker (Planned)
MAX phases are a family of atomically layered ternary carbides and nitrides that exhibit properties that combine some of the best attributes of both metals and ceramics. Notably, these materials display a hysteretic stress-strain response, pseudo-ductility, and high damage tolerance primarily due to their layered structure with strong intralayer and weak interlayer bonding. Recently, several attempts were made to characterize the single-crystal level mechanical response of small-scale specimens milled from individual grains. This showed that MAX phases' grain-level deformation and failure mechanisms depend on the grains' crystallographic orientation and deformation constraint. Herein, we first conduct unconventional small-scale tests on single-crystal specimens of a Cr2AlC to directly analyze the effects of imposed deformation constraints, followed by the analysis of the fracture response using notched microcantilever beams. The results of these micromechanical tests focus on correlating the effects of imposed constraints and the crystallographic orientation of single-crystal specimens on their fracture response.