Back to Search
Start Over
Atomic cluster dynamics causes intermittent aging of metallic glasses.
- Source :
-
Acta Materialia . Apr2024, Vol. 267, pN.PAG-N.PAG. 1p. - Publication Year :
- 2024
-
Abstract
- In the past two decades, numerous relaxation or physical aging experiments of metallic glasses have revealed signatures of intermittent atomic-scale processes. Revealed via intensity cross-correlations from coherent scattering using X-ray photon correlation spectroscopy (XPCS), the observed abrupt changes in the time-domain of atomic motion does not fit the picture of gradual slowing down of relaxation times and their origin continues to remain unclear. Using a binary Lennard-Jones model glass subjected to microsecond-long isotherms, we show here that temporally and spatially heterogeneous atomic-cluster activity at different length-scales drive the emergence of highly non-monotonous intensity cross-correlations. The simulated XPCS experiments reveal a variety of time-dependent intensity-cross correlations that, depending on both the structural evolution and the q -space sampling, give detailed insights into the possible structural origins of intermittent aging measured with XPCS. [Display omitted] [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13596454
- Volume :
- 267
- Database :
- Academic Search Index
- Journal :
- Acta Materialia
- Publication Type :
- Academic Journal
- Accession number :
- 175569518
- Full Text :
- https://doi.org/10.1016/j.actamat.2024.119730