The slow β-relaxation observed in Ce-based bulk metallic glass-forming supercooled liquid

Liu, X.F.; Zhang, B.; Wen, Ping; Wang, W.H.

doi:10.1016/j.jnoncrysol.2006.08.006

Cited by 27 publications

(19 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The measured activation energy, E beta , is determined to be 1.39 eV, which is well consistent with the reported values of Zr-based glasses obtained by the enthalpy relaxation approach 8 . It is worth noting that the E beta value is in accordance to the universal activation energy (B26RT g ) of JG relaxation, the dynamic characteristics widely observed in glassy materials 8,9,17,18,21,22 . Although the broad sub-T g exothermic peak in the DSC traces of the ultra-quenched metallic glasses may be the outcome of combined JG and primary relaxations together with other possible sources, such as irreversible structural relaxation, the dynamic identity of the activation energy provides the solid evidence that the low-temperature side of relaxation spectra and the onset of C p mainly originate from JG relaxation, while the contribution of the structural relaxation is minor.…”

supporting

confidence: 75%

Structural origins of Johari-Goldstein relaxation in a metallic glass

et al. 2014

View full text Add to dashboard Cite

Johari-Goldstein or b relaxation, persisting down to glassy state from a supercooled liquid, is a universal phenomenon of glassy dynamics. Nevertheless, the underlying micromechanisms leading to the relaxation are still in debate despite great efforts devoted to this problem for decades. Here we report experimental evidence on the structural origins of Johari-Goldstein relaxation in an ultra-quenched metallic glass. The measured activation energy of the relaxation (B26 times of the product of gas constant and glass transition temperature) is consistent with the dynamic characteristics of Johari-Goldstein relaxation. Synchrotron X-ray investigations demonstrate that the relaxation originates from short-range collective rearrangements of large solvent atoms, which can be realized by local cooperative bonding switch. Our observations provide experimental insights into the atomic mechanisms of Johari-Goldstein relaxation and will be helpful in understanding the low-temperature dynamics and properties of metallic glasses.

show abstract

supporting

confidence: 75%

Structural origins of Johari-Goldstein relaxation in a metallic glass

et al. 2014

View full text Add to dashboard Cite

show abstract

“…1 as a function of the relaxation frequency, 0 = (2 ) −1 [20]. [23,24], Zr 55 Cu 25 Ni 5 AL 10 Nb 5 (G) [25], Zr 65 Al 7.5 Cu 17.5 Ni 10 (G) [26], Zr 55 Al 10 Ni 5 Cu 30 (G) [27], and Zr 36 Ti 24 Be 40 (E) [28], Pd 40 Ni 10 Cu 30 P 20 (E) [29], Pd 40 Ni 40 P 20 (G) [26], Ce 70 Al 10 Cu 20 (G) [30]. The inset of Fig.…”

Section: Resultsmentioning

confidence: 99%

Non-exponentiality of structural relaxations in glass forming metallic liquids

Wang

Chen

Zhao

et al. 2010

Journal of Alloys and Compounds

View full text Add to dashboard Cite

“…Concerning the shape of the relaxation function, Liu and Wang [97,98] fitted the DMA behavior of Ce-based and Zr-Ti-Cu-Ni-Be glasses assuming that τ(T) follows a VFT behavior and relaxation can be described by the KWW function. The loss modulus was computed by Fourier transform finding that in the temperature region higher than Tg the experimental data was well reproduced; however, in the lower temperature region, the fitting was poorer.…”

Section: Modeling Of the Mechanical Relaxation Spectrummentioning

confidence: 99%

Mechanical Relaxation of Metallic Glasses: An Overview of Experimental Data and Theoretical Models

Liu

Pineda

Crespo

2015

Metals

View full text Add to dashboard Cite

Relaxation phenomena in glasses are a subject of utmost interest, as they are deeply connected with their structure and dynamics. From a theoretical point of view, mechanical relaxation allows one to get insight into the different atomic-scale processes taking place in the glassy state. Focusing on their possible applications, relaxation behavior influences the mechanical properties of metallic glasses. This paper reviews the present knowledge on mechanical relaxation of metallic glasses. The features of primary and secondary relaxations are reviewed. Experimental data in the time and frequency domain is presented, as well as the different models used to describe the measured relaxation spectra. Extended attention is paid to dynamic mechanical analysis, as it is the most important technique allowing one to access the mechanical relaxation behavior. Finally, the relevance of the relaxation behavior in the mechanical properties of metallic glasses is discussed.

show abstract

The slow β-relaxation observed in Ce-based bulk metallic glass-forming supercooled liquid

Cited by 27 publications

References 21 publications

Structural origins of Johari-Goldstein relaxation in a metallic glass

Structural origins of Johari-Goldstein relaxation in a metallic glass

Non-exponentiality of structural relaxations in glass forming metallic liquids

Mechanical Relaxation of Metallic Glasses: An Overview of Experimental Data and Theoretical Models

Contact Info

Product

Resources

About