About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
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Honorary Symposium in Celebration of Prof. Michel Barsoum’s 70th Birthday
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| Presentation Title |
O-1: Anisotropic Cracking and Lack Thereof in MAX Phases |
| Author(s) |
Milos Dujovic, Sahin Celik, Thierry Ouisse, Ankit Srivastava, Miladin Radovic |
| On-Site Speaker (Planned) |
Milos Dujovic |
| Abstract Scope |
In this work, we demonstrate that in atomically layered ceramics, such as MAX phases, crack growth is extremely anisotropic and for certain crystal orientations, no crack growth occurs even under Mode I loading. We will present the results of micromechanical testing of notched cantilever beams of chromium aluminum carbide MAX phase. The experiments are carried out for specimens with the basal (slip/cleavage) planes oriented either parallel, perpendicular or at an angle close to 45 degrees relative to the notch. The results show that when the basal planes are parallel to the notch, specimens undergo unstable cracking. However, when the basal planes are at 45 degrees with respect to the notch, no cracking occurs, and the notched samples undergo extensive crystallographic slip. In addition to the experiments, we will also present crystal plasticity finite element simulation results rationalizing experimental observations. |