Identification of rejuvenation and relaxation regions in a Zr-based metallic glass induced by laser shock peening

Mahmoud, Zaid H.; Barazandeh, Hanif; Mostafavi, Seyed Mojtaba; Ershov, Kirill; Goncharov, A. V.; Kuznetsov, Alexey; Kravchenko, Olga D.; Zhu, Yu

doi:10.1016/j.jmrt.2021.02.025

Cited by 25 publications

(9 citation statements)

References 38 publications

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“…In our previous work, the atomic-scale dynamic behavior of the system during the dilution process was investigated [ 28 ]. The Voronoi volume linearly increases during stage I and slowly increase at stage II , illustrating that the free volume continues to be generated inside the glassy matrix during the dilution process [ 34 ]. Continuing to remove atoms from the system, the activation of

relaxation and the transit to

relaxation corresponds to a decrease of Voronoi volume as observed in stage III .…”

Section: Resultsmentioning

confidence: 99%

Relaxation and Strain-Hardening Relationships in Highly Rejuvenated Metallic Glasses

et al. 2022

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One way to rejuvenate metallic glasses is to increase their free volume. Here, by randomly removing atoms from the glass matrix, free volume is homogeneously generated in metallic glasses, and glassy states with different degrees of rejuvenation are designed and further mechanically tested. We find that the free volume in the rejuvenated glasses can be annihilated under tensile or compressive deformation that consequently leads to structural relaxation and strain-hardening. Additionally, the deformation mechanism of highly rejuvenated metallic glasses during the uniaxial loading–unloading tensile tests is investigated, in order to provide a systematic understanding of the relaxation and strain-hardening relationship. The observed strain-hardening in the highly rejuvenated metallic glasses corresponds to stress-driven structural and residual stress relaxation during cycling deformation. Nevertheless, the rejuvenated metallic glasses relax to a more stable state but could not recover their initial as-cast state.

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relaxation and the transit to

relaxation corresponds to a decrease of Voronoi volume as observed in stage III .…”

Section: Resultsmentioning

confidence: 99%

Relaxation and Strain-Hardening Relationships in Highly Rejuvenated Metallic Glasses

et al. 2022

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“…A sharp probe with a tip diameter of ∼ 2 nm facilitates the highresolution scanning of samples. e energy dissipation of surfaces was calculated from the phase shift measurement [21]. To attain reliable results, AFM scanning was conducted in different windows on the sample surfaces.…”

Section: Methodsmentioning

confidence: 99%

“…In recent years, atomic force microscopy (AFM) has been offered for this purpose [18][19][20]. For example, Mahmoud et al [21] applied dynamic AFM to characterize the relaxation of nanoscale regions in a shock-peened BMG. Using highresolution AFM, it was found that chemical variations changed the structural heterogeneity in the amorphous alloys [22].…”

Section: Introductionmentioning

confidence: 99%

The Effects of Minor Element Addition on the Structural Heterogeneity and Mechanical Properties of ZrCuAl Bulk Metallic Glasses

Sivaraman

Patra

Najm³

et al. 2022

Advances in Materials Science and Engineering

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The present study reveals the role of Nb and Ni minor addition on the nanomechanical properties and nanostructure of ZrCuAl bulk metallic glass (BMG). For this purpose, atomic force microscopy (AFM) was used to evaluate the viscoelastic response of the BMG surface at the nanoscale, while the nanoindentation technique was applied to show the mechanism of plastic deformation. The results indicated that minor Nb addition decreased the relaxation of enthalpy accompanied by the weakening of structural heterogeneity. On the other hand, Ni addition improved the stored energy of the material and intensified the distribution of loosely packed regions in the microstructure. Moreover, the mechanical test unveiled that Ni addition enhanced the viscoelastic response; however, it came at the expense of creep resistance. The evaluation of the magnitude of the derivative in the nanoindentation test also demonstrated that the Ni-added sample exhibited a multiple shear-band mode for plastic deformation.

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“…Owing to the absence of conventional structural defects, bulk metallic glasses (BMGs) show outstanding properties such as excellent compressive strength, extensive elastic limit and high corrosion resistance [1][2][3][4] . However, their embrittlement at the room temperature restricts their potential applications in the industries [5][6][7] .…”

Section: Introductionmentioning

confidence: 99%

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.

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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.

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Identification of rejuvenation and relaxation regions in a Zr-based metallic glass induced by laser shock peening

Cited by 25 publications

References 38 publications

Relaxation and Strain-Hardening Relationships in Highly Rejuvenated Metallic Glasses

Relaxation and Strain-Hardening Relationships in Highly Rejuvenated Metallic Glasses

The Effects of Minor Element Addition on the Structural Heterogeneity and Mechanical Properties of ZrCuAl Bulk Metallic Glasses

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

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