Bending behavior of as-cast and annealed ZrCuNiAl bulk metallic glass

doi:10.1016/j.jmst.2017.07.002

Abstract

Abstract:

Here ZrCuNiAl bulk metallic glass samples were annealed below its glass transition temperature. The bending behaviors and thermal properties of the as-cast and the annealed samples were studied. The increase of annealing time leads to the transition from ductile to more brittle behavior during bending tests. Meanwhile, prolonging the annealing causes a gradual decrease in the free volume content. Based on free volume theory, the change in the microstructure and mechanical properties induced by annealing treatment has been interpreted in detail.

Key words: Bulk metallic glasses, Annealing, Bending, Fracture, Free volume

Huang Yongjiang, Ning Zhiliang, Shen Zhe, Liang Weizhong, Sun Haicao, Sun Jianfei. Bending behavior of as-cast and annealed ZrCuNiAl bulk metallic glass[J]. J. Mater. Sci. Technol., 2017, 33(10): 1153-1158.

Figures/Tables 7

Fig. 1. XRD patterns of the as-cast and 350 °C annealed Zr55Cu30Ni5Al10 (at.%) bulk metallic glass samples.

Fig. 2. The bending load-deflection curves of the Zr55Cu30Ni5Al10 bulk metallic glass samples of different states. For comparison, the curves were shifted along horizontal axis.

Table 1 The fracture energy for bending tests, the mean surface roughness of the fracture surface, heat release just below Tg in DSC curves, and the local ordering content of the as-cast and the 350 °C annealed Zr55Cu30Ni5Al10 bulk metallic glass samples.

Sample	Fracture energy (kJ/m²)	Mean surface roughness, R_m (μm)	Heat release (J/g)	Local ordering content
As-cast	286.9	5.20	11.92	～6.3%
Annealed for 4 h	75.2	3.31	5.26	～7.8%
Annealed for 8 h	62.4	2.207	4.67	～10.9%
Annealed for 12 h	50.0	1.913	2.04	～12.5%

Fig. 3. SEM micrographs of the middle part in the fracture surface of the Zr55Cu30Ni5Al10 bulk metallic glass samples of different states: (a) as-cast; annealed at 350 °C for (b) 4 h, (c) 8 h, and (d) 12 h, and (e) the enlarged image of the 12 h annealed sample highlighting the mirror-like region.

Fig. 4. Three dimensional (3-D) laser scanning confocal microscope images of the middle part in the fracture surface of the Zr55Cu30Ni5Al10 bulk metallic glass samples of different states: (a) as-cast; and annealed at 350 °C for (b) 4 h, (c) 8 h, and (d) 12 h.

Fig. 5. DSC curves of the as-cast and 350 °C annealed Zr55Cu30Ni5Al10 BMG samples with inset highlighting the enlarged section of DSC curves below the glass transition temperature.

Fig. 6. HRTEM image and the selected area electron diffraction pattern (inset) of the as-cast sample (a) and the Zr-based BMG sample annealed at 350 °C for (b) 4 h, (c) 8 h, and (d) 12 h, and the corresponding ACF images (a′), (b′), (c′), and (d′).

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