scholarly journals Unraveling strongly entropic effect on β -relaxation in metallic glass: Insights from enhanced atomistic samplings over experimentally relevant timescales

2020 ◽  
Vol 102 (17) ◽  
Author(s):  
Yi-Bo Yang ◽  
Qun Yang ◽  
Dan Wei ◽  
Lan-Hong Dai ◽  
Hai-Bin Yu ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Β Relaxation ◽  
Entropic Effect

Main α relaxation and slow β relaxation processes in a La30Ce30Al15Co25 metallic glass

2019 ◽  
Vol 35 (6) ◽  
pp. 982-986 ◽  
Author(s):  
J.C. Qiao ◽  
Y.H. Chen ◽  
R. Casalini ◽  
J.M. Pelletier ◽  
Y. Yao
Keyword(s):  
Metallic Glass ◽  
Relaxation Processes ◽  
Β Relaxation

Revealing β-relaxation mechanism based on energy distribution of flow units in metallic glass

2016 ◽  
Vol 144 (14) ◽  
pp. 144501 ◽  
Author(s):  
Z. Lu ◽  
B. S. Shang ◽  
Y. T. Sun ◽  
Z. G. Zhu ◽  
P. F. Guan ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Energy Distribution ◽  
Relaxation Mechanism ◽  
Flow Units ◽  
Β Relaxation ◽  
Distribution Of Flow

scholarly journals Influence of Vibrational Loading on Deformation Behavior of Metallic Glass: A Molecular Dynamics Study

Metals ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1197 ◽  
Author(s):  
Mao Zhang ◽  
Qiaomin Li ◽  
Jiacheng Zhang ◽  
Xinyun Wang ◽  
Junsong Jin ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Metallic Glass ◽  
High Frequency ◽  
Deformation Behavior ◽  
Elastoplastic Deformation ◽  
Accelerated Aging ◽  
Vibrational Loading ◽  
Average Deformation ◽  
Acoustic Softening ◽  
Β Relaxation

The influence of vibrational loading on the deformation behavior of a Zr50Cu46Al4 metallic glass (MG) was characterized via molecular dynamics approaches. High-frequency (1 GHz) vibrational loading was imposed on the elastoplastic deformation stage during the uniaxial tension of the MG conducted at 50 K. It was found that imposing vibrational loading scarcely reduces the average deformation resistance. On the contrary, it results in a notable residual hardening effect after the vibrational loading is removed, which differs significantly from the previously reported acoustic softening mechanisms. Vibrational loading can increase the fraction of STZed atoms and enhance the shear localization degree, which is beneficial to the shear deformation of MGs. Meanwhile, the influence of vibrational loading on the local microstructure of MG is negligible. A plausible explanation of these phenomena is given by considering the accelerated aging of MG stemming from the β relaxation.

Room temperature activated slow β relaxation and large compressive plasticity in a LaCe-based bulk metallic glass

2020 ◽  
Vol 122 ◽  
pp. 106793 ◽  
Author(s):  
Xiao Cui ◽  
Ji Chao Qiao ◽  
Jin Jing Li ◽  
Ling Zi Meng ◽  
Jing Guo ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Room Temperature ◽  
Β Relaxation

scholarly journals Intrinsic correlation between β-relaxation and spatial heterogeneity in a metallic glass

2016 ◽  
Vol 7 (1) ◽  
Author(s):  
F. Zhu ◽  
H. K. Nguyen ◽  
S. X. Song ◽  
Daisman P. B. Aji ◽  
A. Hirata ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Spatial Heterogeneity ◽  
Intrinsic Correlation ◽  
Β Relaxation

Distinctive slow β relaxation and structural heterogeneity in (LaCe)-based metallic glass

2018 ◽  
Vol 742 ◽  
pp. 536-541 ◽  
Author(s):  
W. Zhai ◽  
C.H. Wang ◽  
J.C. Qiao ◽  
J.M. Pelletier ◽  
F.P. Dai ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Structural Heterogeneity ◽  
Β Relaxation

scholarly journals Rejuvenation Behavior and New Classification of β-relaxation Region in Pd-based Metallic Glass

2019 ◽  
Vol 68 (3) ◽  
pp. 191-198 ◽  
Author(s):  
Rui YAMADA ◽  
Naoyuki TANAKA ◽  
Wei GUO ◽  
Junji SAIDA
Keyword(s):  
Metallic Glass ◽  
New Classification ◽  
Β Relaxation

scholarly journals Correlation between High Temperature Deformation and β Relaxation in LaCe-Based Metallic Glass

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 833 ◽  
Author(s):  
Yinghong Chen ◽  
Jichao Qiao
Keyword(s):  
Glass Transition ◽  
High Temperature ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Metallic Glass ◽  
Strain Rate ◽  
Activation Volume ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Β Relaxation

High-temperature deformation around the glass transition temperature Tg and the dynamic mechanical behavior of La30Ce30Al15Co25 metallic glass were investigated. According to dynamic mechanical analysis (DMA) results, La30Ce30Al15Co25 metallic glass exhibits a pronounced slow β relaxation process. In parallel, strain-rate jump experiments around the glass transition temperature were performed in a wide range of strain rate ranges. The apparent viscosity shows a strong dependence on temperature and strain rate, which reflects the transition from non-Newtonian to Newtonian flow. At low strain or high temperature, a transition was observed from a non-Newtonian viscous flow to Newtonian viscous flow. It was found that the activation volume during plastic deformation of La30Ce30Al15Co25 metallic glass is higher than that of other metallic glasses. Higher values of activation volume in La30Ce30Al15Co25 metallic glass may be attributed to existence of a pronounced slow β relaxation. It is reasonable to conclude that slow β relaxation in La30Ce30Al15Co25 metallic glass corresponds to the “soft” regions (structural heterogeneities) in metallic glass.

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