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Title: Effect of heat treatment paths on the aging and rejuvenation of metallic glasses

Journal Article · · Physical Review Materials

Here, this study explores the influence of heat treatment paths on the structural relaxation of metallic glasses (MGs) in the regime of fast dynamics. We create MG samples using various quenching rates, from 109 to 1011 K/s, and expose these samples to near-Tg heat treatments with assorted combinations of heating/cooling rates, from 5×1010 to 5×1012 K/s, and annealing durations, from 10 ps to 10 ns. Results show that the effect of the heating rate is intricately tied to the initial structure of the MG, while a decrease in the cooling rate invariably intensifies the aging process. Extending the annealing duration may induce either aging or rejuvenation, subject to the specific thermal history. To interpret these findings, we hypothesize that the memory effect, governed by the activation and annihilation of reversible and irreversible flow units, underpins the rejuvenation-aging competition in MGs. Moreover, we suggest viewing the cooling stage as an annealing phase controlled by gradient temperature and fine-tuning its rate to achieve the targeted active flow unit distributions. This study illuminates the role of fast dynamics during the glass relaxation process and offers practical strategies for tailoring heat treatments to optimize MG structures and mechanical performance.

Research Organization:
Univ. of Southern California, Los Angeles, CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
SC0020295; AC52-07NA27344
OSTI ID:
2242486
Alternate ID(s):
OSTI ID: 2282839
Journal Information:
Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 12 Vol. 7; ISSN 2475-9953
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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