Correlation Between Dynamic Compressive Strength and Fracture Behaviors of Bulk Metallic Glasses

doi:10.1007/s40195-020-01065-5

Abstract

Abstract:

The mechanical behaviors of Zr_43.5Cu_43.5Ni₄Al₈Nb₁, Zr_55.4Cu_31.6Ni₄Al₈Nb₁, Ti_32.8Zr_30.2Ni_5.3Cu₉Be_22.7 (at.%) metallic glass at different strain rates were studied. For all the present alloys, the dispersion over 700 MPa was observed on the strength in the repeated dynamic compressions, which was much stronger than that of the quasi-static compressive strength. Such the dispersion of the dynamic compressive strength was well correlated with the corresponding fracture behaviors. The area of fracture surface was calculated and also showed a strong dispersion for all the fractured specimens tested at the strain rate of 500 s^-1 and 1000 s ^-1. All the specimens showed a linear relationship between the square of dynamic compressive strength and the area of fracture surface in the dynamic compression tests. This phenomenon was mainly thought to be related to the difference of mean initial free volume concentration of different samples, stress concentration caused by the split Hopkinson pressure bar experimental setup and high sensitivity of defects under dynamic deformation. These findings were beneficial to deeply understand the effect of strain rate on the mechanical properties of the metallic glass.

Key words: Metallic glass, Dynamic compression, Weibull statistics, Shear bands

Wenqing Li, Zhengwang Zhu, Guojie Li, Long Zhang, Zhengkun Li, Huameng Fu, Hongwei Zhang, Hong Li, Aimin Wang, Haifeng Zhang. Correlation Between Dynamic Compressive Strength and Fracture Behaviors of Bulk Metallic Glasses[J]. Acta Metallurgica Sinica (English Letters), 2020, 33(10): 1407-1415.

Figures/Tables 9

Fig. 1 Schematic illustration of the SHPB apparatus

Fig. 2 XRD patterns of the as-cast samples

Fig. 3 Typical compressive strain-stress curves for the Z43, Z55 and T33 BMGs at the strain rate of 5 × 10-4 s-1

Fig. 4 Typical dynamic compressive strain-stress curves for the Z43, Z55 and T33 BMGs at the strain rate of a 500 s-1, b 1000 s-1

Fig. 5 a Normalized strength at the strain rate of 5 × 10-4 s-1, 500 s-1, 1000 s-1, b-d the corresponding two-parameter Weibull plots of strength for the Z43, Z55 and T33 BMGs

Table 1 List of two-parameter Weibull modulus (m) and the scaling stress (σ0) of three alloys at different strain rates

Composition	Strain rate (s^-1)	m	σ₀ (MPa)
Z43	5 × 10^-4	42.2	2001
Z55	5 × 10^-4	31.6	1753
T33	5 × 10^-4	24.5	1850
Z43	500	9.8	1536
Z55	500	11.6	1439
T33	500	14.4	1345
Z43	1000	15.9	1442
Z55	1000	10.9	1370
T33	1000	11.8	1312

Fig. 6 Slide view of fractured Z55 at a-f 500 s-1, g-m 1000 s-1

Fig. 7 Fracture morphologies of Z55 at 5 × 10-4 s-1 (a-c), 500 s-1 (d-f)

Fig. 8 σ2F versus An of three alloys at 500 s-1 and 1000 s-1

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