|About this Abstract
||Materials Science & Technology 2011
||MS&T'11 Poster Session
||200 Investigation of the Formation and Extraordinary Thermal Stability of Mg Nano-Grains in Ti2AlC-Mg Composites
||Babak Anasori, Michel W. Barsoum
|On-Site Speaker (Planned)
Recently we reported on the formation of Mg nano-grains by spontaneously melt infiltrating Mg into Ti<sub>2</sub>AlC porous preforms. This procedure leads to composites with phenomenal strengths. The Mg nano-grains are also so stable that annealing at 500 °C for 8 h did not lead to their coarsening. Neither did heating the composites to 50°C higher than the melting point of Mg. It is believed that thin oxide layers at the Mg grain boundaries as well as Mg penetration into the Ti<sub>2</sub>AlC planes confine the Mg nanograins and prevent them from coarsening. Herein, the composite's microstructure is studied by scanning electron and transmission electron microscopy on bulk samples, fractured surfaces, as well as Mg/Ti<sub>2</sub>AlC diffusion couples. The results shed light on why the Mg forms as nano-grains and why they are as stable as they are.