Ultrafast extreme rejuvenation of metallic glasses by shock compression

Ding, Guangliang; Li, C.; Zaccone, Alessio; Wang, W. H.; Lei, Hechang; Jiang, F.; Zhong, Lijuan; Jiang, Minqiang

doi:10.1126/sciadv.aaw6249

Cited by 74 publications

(26 citation statements)

References 60 publications

(109 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The degree of volume changes under the cyclic loading was also presented in Figure 2. The trends of bulk volume and potential energy are similar to each other, which indicates that the increase in energy state is accompanied with the generation of free volumes and loosely packed structures in the material 42,43 . Figure 2 also indicates the effects of simultaneous cyclic and annealing (600 K) treatments on the structural rejuvenation of CuZr glassy alloy.…”

Section: Resultssupporting

confidence: 53%

Combined Effects of Annealing and Cyclic Loading on Structural Rejuvenation and Mechanical Properties of CuZr Metallic Glass: A Molecular Dynamics Study

Anggono¹,

Mahmoud

Suksatan

et al. 2022

Mat. Res.

View full text Add to dashboard Cite

Structural rejuvenation is one of the key topics in the field of metallic glasses (MGs). In this work, we evaluated the combined effects of annealing treatment and elastic cyclic loading to discover pathways for promoting structural rejuvenation and improving the mechanical properties in the MGs. Using molecular dynamics (MD) simulations, it was revealed that the sole cyclic loading led to the increase of rejuvenation degree; however, a saturated state was observed upon the 40 th cycle. On the other side, the sample exposed to the combined treatment exhibited a slight relaxation at the first step of cycling process and then a sharp rejuvenation degree was detected in the material. The thorough analyses indicated that the change in the fraction of coordination polyhedrons at the relaxation stage was the main reason for the extra rejuvenation in the sample exposed to the combined treatments. The results also suggest that the combination of rejuvenation treatments improves the magnitude of rejuvenation in the amorphous alloys. It should be noted that the increase of rejuvenation in the alloying systems accompanied with a reduction in the tensile strength and an enhancement in the homogenous plastic deformation.

show abstract

Section: Resultssupporting

confidence: 53%

Combined Effects of Annealing and Cyclic Loading on Structural Rejuvenation and Mechanical Properties of CuZr Metallic Glass: A Molecular Dynamics Study

Anggono¹,

Mahmoud

Suksatan

et al. 2022

Mat. Res.

View full text Add to dashboard Cite

show abstract

“…Previous works showed that the two-state level system or structural rejuvenation can be achieved by thermal cycling, [10] thermomechanical creep, [11] elastostatic loading, [12] and shock compression. [13] However, the physical mechanism underlying this phenomenon has remained poorly understood. In this letter, we propose a theoretical approach based on the ECNLE theory to calculate the temperature dependence of structural relaxation time and diffusion constant of metallic glasses under external pressures.…”

Section: Introductionmentioning

confidence: 99%

Impact of High Pressure on Reversible Structural Relaxation of Metallic Glass

Ngân

Phan

Zaccone

2021

Physica Rapid Research Ltrs

Self Cite

View full text Add to dashboard Cite

The temperature dependence of the reversible structural relaxation time and diffusion constant of metallic glasses under pressure is theoretically investigated. The compression not only changes the glassy dynamics, but also generates a metastable state along with a higher‐energy state where the system can rejuvenate. The relaxation times for forward and backward transitions in this two‐state system are nearly identical and much faster than the relaxation time without accounting for barrier recrossing. At ambient pressure, the expected irreversible relaxation process is recovered, and the numerical results agree well with prior experimental results. An increase in pressure has a minor effect on the relaxation time and diffusion constant that one computes without considering the influence of the metastable state, but it leads to a large reduction of the reversible relaxation time computed upon considering the metastable state. The presence of external compression is also shown to trigger a fragile‐to‐strong crossover in metallic glasses.

show abstract

“…Using molecular dynamic (MD) simulation of cyclic loading, it was found that rejuvenation is correlated with the increase in nanoscale heterogeneity and, nucleation and distribution of shear transformation zones 22,23 . Using shock stress amplitudes, Ding et al 24 successfully rejuvenated Zr 55 Cu 30 Ni 5 Al 10 on very short time scales. In another study, Sohrabi et al 25 indicated that an intense ultrasonic elastic processing may be lead to the increased atomic mobility and oscillatory energy storage.…”

Section: Introductionmentioning

confidence: 99%

Effect of Surface Mechanical Attrition Treatment on Micro-mechanical Properties of ZrCuAlNi Bulk Metallic Glass

et al. 2021

View full text Add to dashboard Cite

In this work, surface mechanical attrition treatment (SMAT) was employed to rejuvenate ZrCuAlNi bulk metallic glass (BMG) plate. Differential scanning calorimetry (DSC), atomic force microscopy (AFM) and nanoindentation analyses were carried out to evaluate stored energy and micro-mechanical properties of treated BMGs. According to DSC results, 10 min SMAT process increased the stored energy of BMG plates up to 50%. AFM analysis showed that the structural rejuvenation occurred in the bulk of samples and just a slight rejuvenation gradient was detected from the front to the back side of BMG plates. Nanoindentation analysis indicated that the structural rejuvenation is consistent with anelastic strain induced under the SMAT process. It was also found that an optimum treatment time is needed for maximum rejuvenation in the BMGs. This event is due to the fact that the glassy structure is able to store a critical anelastic strain, which leads to a saturated condition in rejuvenation.

show abstract

Ultrafast extreme rejuvenation of metallic glasses by shock compression

Cited by 74 publications

References 60 publications

Combined Effects of Annealing and Cyclic Loading on Structural Rejuvenation and Mechanical Properties of CuZr Metallic Glass: A Molecular Dynamics Study

Combined Effects of Annealing and Cyclic Loading on Structural Rejuvenation and Mechanical Properties of CuZr Metallic Glass: A Molecular Dynamics Study

Impact of High Pressure on Reversible Structural Relaxation of Metallic Glass

Effect of Surface Mechanical Attrition Treatment on Micro-mechanical Properties of ZrCuAlNi Bulk Metallic Glass

Contact Info

Product

Resources

About