|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XIX
||Atomic motion in ultrastable metallic glasses
||Beatrice Ruta, Martin Luettich, Konrad Samwer
|On-Site Speaker (Planned)
A major obstacle in the use of glasses is their instability over time due to ongoing relaxation processes. This is particularly the case for metallic glasses where aging can lead even to fractures or crystallization. Ultrastable MGs keep the promise to overcome this problem. As suggested by their name, they are claimed to be stable with respect to their previous thermal history and physical aging, which makes of them ideal materials for technological applications. Thanks to the use of intense coherent X-rays, we have investigated the collective atomic motion in ultrastable MGs. We find a signature of ultrastability at the atomic level that results in a slower relaxation dynamics with respect to that of conventional Mgs, and in a peculiar acceleration of the dynamics close to the glass transition . This surprising phenomenon can be understood in the framework of the potential energy landscape.