Intrinsic Correlation between the Fraction of Liquidlike Zones and the 
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 Relaxation in High-Entropy Metallic Glasses

Duan, Y.J.; Zhang, L. T.; Qiao, J.C.; Wang, Yun-Jiang; Yang, Yong; Wada, Takeshi; Kato, Hidemi; Pelletier, Jean-Marc; Pineda, Eloi; Crespo, Daniel

doi:10.1103/physrevlett.129.175501

Cited by 45 publications

(7 citation statements)

References 54 publications

(66 reference statements)

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“…Figure 5 depicts the CTE of the borosilicate glass and α‐Al 2 O 3 as a function of temperature. The glass always had a larger CTE than that of the alumina when the temperature was below its softening point ( T s ), which demonstrated the origin of the internal residual stress 44,45 …”

Section: Resultsmentioning

confidence: 99%

Calibration for determination of compressive stress in glass‐to‐metal seals via photoluminescence spectroscopy

Liu,

Cai,

Gong

et al. 2023

J Am Ceram Soc.

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Compressive stress in glass‐to‐metal seals is crucial to ensure sealing quality and service reliability. Photoluminescence spectroscopy (PS), which relies on the piezospectroscopic effect of Cr‐doped α‐Al2O3, shows promise for stress detection owing to its rapid detection, non‐destruction, and high resolution. The premise of the PS technique is to fill a glass matrix with alumina particles and detect signals from the alumina. In this study, the interaction between alumina particles and the glass matrix was analyzed to calibrate the measured stresses and investigate the stress state in the glass. Test results for glass‐to‐metal seals are believed to consist of simultaneous internal residual stress and external applied stress. The internal residual stress is formed due to the coefficient of thermal expansion mismatch between glass and alumina and is assumed to transfer by radial compression. In the experiment, it was detected by the PS technique and verified by X‐ray diffraction using an unstressed sample without metal housing. The external applied stress is formed due to metal housing compaction and possibly transferred by the shear effect. The stress distribution within the pre‐stressed sample containing metal housing was also measured by the PS technique. Then, calibrations were conducted on the measured stresses based on the deduced stress transfer relationships. Finally, finite element models were established to simulate the internal residual stress and external applied stress respectively to prove the validity of the calibration method, and mutually anastomotic results were obtained within the target margin of error.

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Section: Resultsmentioning

confidence: 99%

Calibration for determination of compressive stress in glass‐to‐metal seals via photoluminescence spectroscopy

Liu,

Cai,

Gong

et al. 2023

J Am Ceram Soc.

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“…积模型 [55][56][57] , 对非晶体系施加外力或加热时, 体系内会发生一定程度的原子迁移运动, 自由体积降低. 根据应力弛豫的热活化理论, 激活体积可以推导为 [34,58,59] 快过程与慢过程. Luo等 [36,37] 对 Zr 应力驱动的快过程几乎是瞬时的短程原子重排运动, 而热激活的慢过程则是快过程的渗流, 由长程原子扩散所容纳 [34] .…”

Section: 进一步对应力弛豫结果进行分析根据自由体unclassified

Effects of cooling rate on β relaxation process and stress relaxation of La-based amorphous alloys

Meng,

Hao,

Wang

et al. 2024

Acta Phys. Sin.

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The dynamic relaxation process and stress relaxation are important experimental methods to reflect the microstructure of materials, which are closely related to the diffusion, the glass transition phenomenon and the microstructural heterogeneity. It is of great significance to explore the relationship between them. In the current research, the β-relaxation characteristics and stress relaxation behaviors of bulk and ribbon samples obtained by different cooling rates are systematically investigated using the typical La-based amorphous alloys as model systems. The experimental results demonstrated that the cooling rate is an important parameter for controlling the energy state of the glass system, which in turn affects its physical and mechanical properties. Based on the dynamical mechanical spectra, the larger the cooling rate, the greater the low-temperature internal friction, the smaller the beta relaxation activation energy according to Arrhenius calculations, and the greater the broadening of the beta relaxation behavior in the temperature spectra, suggesting that the higher cooling rate leads to greater atomic mobility and a high degree of heterogeneity in the microstructure. Thermodynamic analysis is used to study the slow process of thermal activation and the fast process driven by stress. At low temperature, the activation volume of the strip sample is larger than that of the bulk sample, and the activation volume value of the two samples is almost the same as that of the cooling rate only affects the β relaxation stage, but has little effect on the α relaxation, which is consistent with the conclusion that the stress relaxation and β relaxation behavior are related to the structural non-uniformity of the amorphous alloy. Based on stress relaxation tests, the characteristic time of deformation decreases at higher cooling rates, the normalized stress decay is larger, it is easier to deform under an applied force field, and the deformation units are more likely to activate to accommodate structural deformation. The correlation between stress relaxation and β relaxation of amorphous alloys is further confirmed, and the proportion of liquid-like region is proportional to the relaxation mode spectrum, which also shows that β relaxation and stress relaxation are consistent. Finally, by calculating relaxation enthalpy △Hrel, the variation of microstructure heterogeneity with cooling rate is experimentally verified. The research sheds new light on further clarifying the association between β relaxation, deformation and microstructural heterogeneity of the amorphous alloy.

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“…In the past, the mechanical properties of materials in time-dependent behaviour [12,13], i.e. creep [14,15], stress relaxation [16,17], etc, have been extensively studied. The results show that the strength of materials decreases with time-dependent behaviour [18,19], leading to a decline in the long-term stability of the structure [20], especially for mud-shale [21,22], which is a type of soft rock in geotechnical engineering.…”

Section: Introductionmentioning

confidence: 99%

Investigation of shear creep experiments and modelling of mud-shale under dry-wet cycles of rainfall

Zhong,

Sheng,

et al. 2024

Phys. Scr.

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The analysis of the creep mechanical properties and the failure mechanisms of mud-shale in response to dry-wet cycles of rainfall are important for the slope stability of Permian limestone with carbonaceous mud-shale. In this paper, shear creep experiments were performed on mud-shale under different dry-wet cycles of rainfall. The classical viscoelastic-plastic creep model was improved and a modified creep model was developed to account for the damage of dry-wet cycles. The results showed that the creep deformation and the long-term strength of the mud-shale varied considerably with dry-wet cycles. In other words, dry-wet cycles had a notable effect on the creep properties of the mud-shale. According to the macroscopic continuum damage theory, the viscoelastic-plastic model was modified considering the damage of dry-wet cycles, which fitted the mud-shale creep curve reasonably well. It was found that there was a good consistency between theoretical predictions of modified model and the experimental dates, and its viscoelastic creep parameters were noted to show a good degradation characteristic with dry-wet cycles. It is indicates that the modified model could be reliably used to simulate and predict the complete creep process in mud-shale, and it also provides a great demonstration of the effect of dry-wet cycles on creep behavior. The model therefore enables a deeper understanding of the long-term stability of slope engineering projects.

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Intrinsic Correlation between the Fraction of Liquidlike Zones and the β Relaxation in High-Entropy Metallic Glasses

Cited by 45 publications

References 54 publications

Calibration for determination of compressive stress in glass‐to‐metal seals via photoluminescence spectroscopy

Calibration for determination of compressive stress in glass‐to‐metal seals via photoluminescence spectroscopy

Effects of cooling rate on <i>β</i> relaxation process and stress relaxation of La-based amorphous alloys

Investigation of shear creep experiments and modelling of mud-shale under dry-wet cycles of rainfall

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