J. Mater. Sci. Technol. ›› 2017, Vol. 33 ›› Issue (10): 1153-1158.DOI: 10.1016/j.jmst.2017.07.002
• Orginal Article • Previous Articles Next Articles
Huang Yongjiangab, Ning Zhiliangab(), Shen Zhec, Liang Weizhongd, Sun Haicaoab, Sun Jianfeiab
Received:
2017-01-04
Revised:
2017-01-24
Accepted:
2017-02-20
Online:
2017-10-25
Published:
2018-01-25
About author:
1 These two authors contributed equally to this paper.
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.
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.
Sample | Fracture energy (kJ/m2) | Mean surface roughness, Rm (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% |
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, Rm (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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