Density fluctuations with fractal order in metallic glasses detected by synchrotron X-ray nano-computed tomography

Huang, Bo; Ge, T. P.; Liu, G.L.; Luan, Junhua; He, Quanfeng; Qin, Yuan; Huang, Wanxia; Zhang, Kai; Bai, H. Y.; Shek, C.H.; Liu, C.T.; Yang, Yong; Wang, W.H.

doi:10.1016/j.actamat.2018.05.064

Cited by 38 publications

(11 citation statements)

References 43 publications

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“…This is consistent with the combined effect of temperature and stress on structural heterogeneity in metallic glasses (Fig. 34(b)) [29]. with Df as 2.5, 2.5, 3 and 2.16, respectively.…”

Section: (A)supporting

confidence: 87%

“…In principle, local structural heterogeneities could be linked to density and chemical fluctuations in an amorphous alloy for the minimization of its free energy locally [28][29][30][31]. As a result of the different local environments of atomic packing, some regions appear topologically unstable (or "liquid-like") or stable (or "solid-like") [32].…”

Section: Introductionmentioning

confidence: 99%

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Une cause inattendue de gonalgie

Kauffmann

Ries

Geronimus

et al. 2019

La Revue de Médecine Interne

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“…This is consistent with the combined effect of temperature and stress on structural heterogeneity in metallic glasses (Fig. 34(b)) [29]. with Df as 2.5, 2.5, 3 and 2.16, respectively.…”

Section: (A)supporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Une cause inattendue de gonalgie

Kauffmann

Ries

Geronimus

et al. 2019

La Revue de Médecine Interne

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“…A 32-bit float-type gray value (g) was assigned to each voxel of the reconstructed structure. The g of the local region in the structural image Figure 3C (i.e., the longitudinal central cross-section of the constructed 3D structure of the axisymmetric MGW near the surface) has a linear relation with the local absorption coefficient of the tested sample, 47 which is positively proportional to the local density of the studied material. 48 Thus, the local density fluctuations of the MGW near the surface can be reflected by the distribution of g (Figure 3C).…”

Section: Synchrotron X-ray Nano-ct Detectionmentioning

confidence: 97%

Unusually thick shear-softening surface of micrometer-size metallic glasses

et al. 2021

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Unusually thick shear-softening surface of micrometer-size metallic glasses. The Innovation 2(2), 100106.The surface of glass is crucial for understanding many fundamental processes in glassy solids. A common notion is that a glass surface is a thin layer with liquid-like atomic dynamics and a thickness of a few tens of nanometers. Here, we measured the shear modulus at the surface of both millimeter-size and micrometer-size metallic glasses (MGs) through high-sensitivity torsion techniques. We found a pronounced shear-modulus softening at the surface of MGs. Compared with the bulk, the maximum decrease in the surface shear modulus (G) for the micro-scale MGs reaches~27%, which is close to the decrease in the G upon glass transition, yet it still behaves solid-like. Strikingly, the surface thickness estimated from the shear-modulus softening is at least 400 nm, which is approximately one order of magnitude larger than that revealed from the glass dynamics. The unusually thick surface is also confirmed by measurements using X-ray nano-computed tomography, and this may account for the brittle-to-ductile transition of the MGs with size reductions. The unique and unusual properties at the surface of the micrometer-size MGs are physically related to the negative pressure effect during the thermoplastic formation process, which can dramatically reduce the density of the proximate surface region in the supercooled liquid state.

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“…We think the reason is that the mechanism of fatigue crack propagation is still elusive. Many experiments have proven that the microstructure of metallic glass is topologically heterogeneous [ 27 , 28 , 29 ]. The heterogeneity strongly affects the deformation [ 30 ] and fracture [ 31 ] behavior of metallic glasses.…”

Section: Discussionmentioning

confidence: 99%

Tension-Tension Fatigue Behavior of High-Toughness Zr61Ti2Cu25Al12 Bulk Metallic Glass

Yang

et al. 2021

Materials

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Bulk metallic glasses have application potential in engineering structures due to their exceptional strength and fracture toughness. Their fatigue resistance is very important for the application as well. We report the tension-tension fatigue damage behavior of a Zr61Ti2Cu25Al12 bulk metallic glass, which has the highest fracture toughness among BMGs. The Zr61Ti2Cu25Al12 glass exhibits a tension-tension fatigue endurance limit of 195 MPa, which is higher than that of high-toughness steels. The fracture morphology of the specimens depends on the applied stress amplitude. We found flocks of shear bands, which were perpendicular to the loading direction, on the surface of the fatigue test specimens with stress amplitude higher than the fatigue limit of the glass. The fatigue cracking of the glass initiated from a shear band in a shear band flock. Our work demonstrated that the Zr61Ti2Cu25Al12 glass is a competitive structural material and shed light on improving the fatigue resistance of bulk metallic glasses.

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Density fluctuations with fractal order in metallic glasses detected by synchrotron X-ray nano-computed tomography

Cited by 38 publications

References 43 publications

Une cause inattendue de gonalgie

Une cause inattendue de gonalgie

Unusually thick shear-softening surface of micrometer-size metallic glasses

Tension-Tension Fatigue Behavior of High-Toughness Zr61Ti2Cu25Al12 Bulk Metallic Glass

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