Dynamic mechanical relaxation and thermal creep of high-entropy La30Ce30Ni10Al20Co10 bulk metallic glass

Zhang, L.T.; Duan, Y.J.; Crespo, Daniel; Pineda, Eloi; Wang, Yun-Jiang; Pelletier, Jean-Marc; Qiao, J.C.

doi:10.1007/s11433-021-1722-y

Cited by 42 publications

(6 citation statements)

References 84 publications

(94 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This means that the satisfaction of the time-temperature-superposition (TTS) principle is expected in many metallic glass-forming systems. Further detailed studies on the dynamic relaxation processes in metallic glasses can be found in literature [38][39][40][41][42] .…”

Section: Resultsmentioning

confidence: 99%

Disentangling structural and kinetic components of the α-relaxation in supercooled metallic liquids

et al. 2022

Self Cite

View full text Add to dashboard Cite

The particle motion associated to the α-relaxation in supercooled liquids is still challenging scientists due to its difficulty to be probed experimentally. By combining synchrotron techniques, we report the existence of microscopic structure-dynamics relationships in Pt42.5Cu27Ni9.5P21 and Pd42.5Cu27Ni9.5P21 liquids which allows us to disentangle structural and kinetic contributions to the α-process. While the two alloys show similar kinetic fragilities, their structural fragilities differ and correlate with the temperature dependence of the stretching parameter describing the decay of the density fluctuations. This implies that the evolution of dynamical heterogeneities in supercooled alloys is determined by the rigidity of the melt structure. We find also that the atomic motion not only reflects the topological order but also the chemical short-range order, which can lead to a surprising slowdown of the α-process at the mesoscopic length scale. These results will contribute to the comprehension of the glass transition, which is still missing.

show abstract

Section: Resultsmentioning

confidence: 99%

Disentangling structural and kinetic components of the α-relaxation in supercooled metallic liquids

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…Previous related report revealed that the precipitation of the special structures at 1-2 nm scales of medium-range order (MRO) can alter the free volume distribution, thereby promoting the nucleation of shear bands in bulk materials, causing them to branch, deflecting their propagation direction, impeding their rapid propagation, and eventually leading to a large overall plastic strain. Therefore, based on the results of TEM observation and the corresponding SAED pattern, it is proposed that such an improvement in plasticity may attribute to the precipitation of α-Fe(Co, Ni) like clusters in the 0.3 and 0.6 at.% Cu-added alloys [39]. Additionally, it can also be noted that the further increase in Cu content to 0.9 and 1.2% leads to a consequent decrease in the plastic strain in the present HE-BMGs.…”

Section: Discussionmentioning

confidence: 99%

Improved Plasticity of Fe25Co25Ni25(Si0.3B0.7)25 High Entropy Bulk Metallic Glass through the Addition of Cu

Fan

Xie

et al. 2022

Acta Metall. Sin. (Engl. Lett.)

View full text Add to dashboard Cite

This work was focused on enhancement in the plasticity of Fe 25 Co 25 Ni 25 (Si 0.3 B 0.7 ) 25 high entropy bulk metallic glass (HE-BMG) by adding minor Cu (0-1.2, in at.%). It is found that the appropriate addition of Cu can efficiently improve the plasticity of the present HE-BMG while the excessive addition of Cu will deteriorate again the plasticity, and especially, the plastic strain of the present HE-BMG is improved from 0.8% for the Cu-free alloy to 4.7% for the 0.3 at.% Cu-added alloy. The transmission electron microscopy observation shows that there are many α-Fe (Co, Ni) clusters with sizes of less than 5 nm dispersed in the glassy matrix in the 0.3 and 0.6 at.% Cu-added alloys, which may account for the significant improvement in the plasticity of the two alloys, and further increase in Cu content more than 0.9 at.% leads to the precipitation of α-Fe (Co, Ni) and Fe (Co, Ni) B compound grains with diameters of tens of nanometers, in which the plasticity of the present HE-BMGs has deteriorated rapidly.

show abstract

“…图中点划线区域为经验公式包围区域 ous alloys with the glass transition temperature [31][32][33][34] , dotted area in the figure is the area surrounded by empirical formula .…”

Section: 玻璃形成熔体在冷却过程中其动态弛豫行为mentioning

confidence: 99%

Probing microstructural heterogeneity of La-based amorphous alloy under versatile mechanical stimuli

Zhang,

Hao,

Zhang

et al. 2024

Acta Phys. Sin.

View full text Add to dashboard Cite

The intrinsic structural heterogeneities of amorphous alloys are closely connected to the thermodynamics and dynamical behavior, such as relaxation/crystallization, glass transition and plastic deformation. However, the structural information is submerged into the meta-stable disordered long-range structure, which made it very difficult to explore the structural heterogeneities of amorphous alloys. A mechanical excitation factor is not sufficient to effectively describe the heterogeneity of the microstructure in amorphous alloys, particularly the correlation between structure and dynamics. To explore the essence of the structure in amorphous alloys, it is necessary to consider the different mechanical stimuli. La62Cu12Ni12Al14 amorphous alloy was selected as model system, dynamic mechanical processes were probed by dynamic mechanical analysis (DMA). The contributions of a relaxation and b relaxation processes were described in the framework of the quasi-point defects theory. Based on the quasi-point defect theory, the α-relaxation and β relaxation in the La-based amorphous alloy were separated. Tensile strain rate jump measurements were conducted to study the high temperature rheological behavior of amorphous alloy. The contributions of elasticity, anelasticity as well as plastic deformation during the plastic rheology of amorphous alloy are determined within the framework of quasi-point defects theory. The current work aims to reveal the structural heterogeneities of amorphous alloys under the action of dynamics with various temporal scales. The physical background of the activation, propagation and coalescence of defects in amorphous alloys under different mechanical stimuli were reviewed.

show abstract

Dynamic mechanical relaxation and thermal creep of high-entropy La30Ce30Ni10Al20Co10 bulk metallic glass

Cited by 42 publications

References 84 publications

Disentangling structural and kinetic components of the α-relaxation in supercooled metallic liquids

Disentangling structural and kinetic components of the α-relaxation in supercooled metallic liquids

Improved Plasticity of Fe25Co25Ni25(Si0.3B0.7)25 High Entropy Bulk Metallic Glass through the Addition of Cu

Probing microstructural heterogeneity of La-based amorphous alloy under versatile mechanical stimuli

Contact Info

Product

Resources

About