Rejuvenation behavior and microstructural evolution of Cu-Zr metallic glass during multiple recovery annealing treatment via molecular dynamic simulation

MZ Wang and SL Lue and SS Wu and W Guo, JOURNAL OF ALLOYS AND COMPOUNDS, 945, 169294 (2023).

DOI: 10.1016/j.jallcom.2023.169294

The evolution of structural characteristics and mechanical properties of Cu-Zr metallic glasses during multiple recovery annealing process was investigated via molecular dynamics simulation. Firstly, the aged and rejuvenated samples were prepared after the first recovery annealing by varying the annealing tem-perature. Then, these samples were subsequently treated with the following annealing process. It is found that when reheating the firstly aged sample (annealing at 900 K) to a higher annealing temperatures of 1100 K at the second annealing, the degree of rejuvenation was even higher than that of the initially re- juvenated sample (annealing at 1100 K) at the same temperature. Microstructural analysis shows that the degree of rejuvenation shows a strong correlation with Cu-centered clusters, around a 4% difference in < 0, 0, 12, 0 > (high local fivefold symmetry) content between the most aged and most rejuvenated samples. Moreover, the volume variation of different atomic clusters in the rejuvenated samples is more obvious. It is noted that the initial aged samples can be rejuvenated to an even higher degree when compared with initial rejuvenated ones. The more icosahedral clusters in the aged sample contributes to such phenomenon since they are more easily modified to other types with low local fivefold symmetry at high annealing tem-perature during the second annealing. The present study demonstrates that the appropriate multiple re-covery annealing can rejuvenate the sample to a higher degree.(c) 2023 Elsevier B.V. All rights reserved.

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