Serration and shear avalanches in a ZrCu based bulk metallic glass composite in different loading methods

doi:10.1016/j.jmst.2019.04.014

Abstract

Abstract:

In the current research, serrated flow is investigated under tensile and compressive loading in a ZrCu-based bulk metallic glass composite (BMGC) that is well known for its plastic deformability, which is higher than that of metallic glasses. Statistical analysis on serrations shows a complex, scale free process, in which shear bands are highly correlated. The distribution of the elastic-energy density stored in each serration event follows a power-law relationship, showing a randomly generated serrated event under both tension and compression tests. The plastic deformation in the temporal space is explored by a time-series analysis, which is consistent with the trajectory convergent evolution in critical dynamic behavior even in the low strain rate regime in both tests. The results demonstrate that the secondary phase in the BMGC can stabilize the shear band extension and facilitate the critical behavior in the low strain rate regime. This study provides a strong evidence of serrated flow phenomenon in BMGC under tension test, and offers a deep understanding of the correlation between serrations and shear banding in temporal space.

Key words: Metallic glass, Bulk metallic glass composites, Serrated flow, Shear avalanches, Statistical analysis, Critical behavior

Haichao Sun, Zhiliang Ning, Jingli Ren, Weizhong Liang, Yongjiang Huang, Jianfei Sun, Xiang Xue, Gang Wang. Serration and shear avalanches in a ZrCu based bulk metallic glass composite in different loading methods[J]. J. Mater. Sci. Technol., 2019, 35(9): 2079-2085.

Figures/Tables 9

Fig. 1. True stress?strain curves of Zr49Cu45Al6 BMGC (a) in tension and (b) in compression. Both of them exhibit the serration events in plastic deformation region.

Table 1 Mechanical properties of Zr49Cu45Al6 BMGC.

	Elastic modulus (GPa)	Yielding strength (MPa)	Maximum strength (MPa)	Maximum strain
Tension	85.9	970.0	1696.0	0.0561
Compression	90.2	980.6	1875.6	0.0658

Fig. 2. XRD patterns and microstructures of the Zr49Cu45Al6 BMGC. (a) Presents the XRD patterns before and after the deformation, (b) and (c) show the crystalline phases corresponding to the XRD pattern in the as cast sample, (d) shows the deformed sample with twinning structures inside the crystalline phase.

Fig. 3. Lateral surfaces and fracture morphologies (a), (c) in tension and (b), (d) in compression.

Fig. 4. Enlarged stress?time curves and corresponding plots of |dσ/dt| for a part of the serrations (a) in tension and (b) in compression.

Table 2 Characteristic parameters of serration events.

Parameters	Tension	Compression
Serrations	～60	～150
t_l, $\bar{t}_{l}$	0.11?3.51, 0.85	0.56?9.94, 2.48
t_r, $\bar{t}_{r}$	0.06?0.86, 0.21	0.06?1.70, 0.29
t_l/t_r,$\bar{{t}_{l}/{t}_{r}}$	0.71?37.34,5.7	1.12?106.86,16.0
Elastic-energy density (J/m³)	7.93?3604.75	57.36?16851.84
Average elastic-energy density (J/m³)	514.2	219.6
Stress drop value (MPa)	0.74?28.65	1.80?26.23
Average stress drop value (MPa)	3.1	5.74
κ	1.18/2.03	1.18/2.03
Δδ_c	811/1984	1230/10628
R²	97.7%/94.3%	97.8%/97.8%
Time delay, τ	72	63
Embedding dimension, m	5	6
Largest Lyapunov exponent, λ	-1.42 × 10^-4	-1.51 × 10^-4
Fractal dimension	1.021	1.053

Fig. 5. Elastic energy densities in the serration events of Zr49Cu45Al6 BMGC as a function of plastic strain.

Fig. 6. Cumulative probability distributions for the elastic energy densities of the composites.

Fig. 7. Sketch for the concepts of the serration event formation (a) in BMG and (b) in BMGC.

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