Journal
MATERIALS TODAY PHYSICS
Volume 27, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.mtphys.2022.100824
Keywords
Memory effect; Metallic glasses; Local structure; Atomic dynamics
Funding
- National Key Research and Development Program of China [2017YFA0403400]
- National Natural Science Foundation of China [U1832203, 11975202]
- NSF of Zhejiang Province [Y4110192, LZ20E010002]
- Fundamental Research Funds for the Central Universities
- DOE Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
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The memory effect in metallic glasses is observed through differential scanning calorimetry and molecular dynamics simulations, indicating that it may originate from the structural rejuvenation and formation of more loose packing configurations during high temperature annealing. In contrast, the high-low temperature annealing only induces monotonic relaxation.
The structural origin of the memory effect is still elusive in glassy materials. In this letter, the memory effect in a series of metallic glasses (MGs) is observed by two step annealing using differential scanning calorimetry (DSC) and molecular dynamics simulations. It demonstrates that the Kovacs peak can be reflected from not only the system potential energy but also the atomic dynamics, showing the memory effect could originate from the formation of more loose packing configurations around mobile atoms by structural rejuvenation in the second step of high temperature annealing. In contrast, the high-low temperature annealing protocol can only induce the monotonic relaxation. Therefore, our results pave a pathway to better understand the origin of memory effect in MGs and other glassy materials from their dynamics and local atomic structure.
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