Figure 1697a shows a HRTEM and electron diffraction pattern of a thermally quenched Zr70Al8Cu13.5Ni8.5 MG (metallic glass). The diffraction pattern shows a diffusion halo, indicating the absence of precipitates with size larger than 3 nm. Moreover, the absence of any nanocrystalline phase in the diffraction pattern confirms that this material consists of only a purely glassy structure in amorphous phase. The HRTEM image further showing a highly disordered structure without any sign of nanocrystals or ordered clusters, confirms again the fully glass nature.
Figure 1697a. HRTEM and electron diffraction pattern of a thermally quenched Zr70Al8Cu13.5Ni8.5 metallic glass. 
The method based on FFT and inverse FFT developed by Miller and Gibson  and extended by Li et al.  and Jiang and Atzmon  later was applied to analyze the SRO (short range ordering) clusters by Zhu et al. . They employed a core–shell model to investigate the shear bands in as-cast Zr64Nb6Cu13.5Ni8.5Al8 specimen (Figure 1697b). In Figure 1697b (b), the bright-yellow part represents the zone with more free volume
(FV), while the dark-blue part represents the zone with less FV. The core is proposed as SRO clusters with a different coordination number (CN)  and the local FV is shell. It is defined that SRO clusters with CN of 12 or more than 12 have no FV, while ordering clusters with CN < 12 have certain FV .
Figure 1697b. (a) HRTEM image of an as-cast sample for Zr64Nb6Cu13.5Ni8.5Al8 alloys (the inset presents fast Fourier transform (FFT) pattern), and (b) The corresponding Fourier-filtered, threshold filtered and inverted image. Adapted from 
 Z.W. Zhu, L. Gu, G.Q. Xie, W. Zhang, A. Inoue, H.F. Zhang, Z.Q. Hu, Relation between icosahedral short-range ordering and plastic deformation in Zr–Nb–Cu–Ni–Al bulk metallic glasses, Acta Materialia 59 (2011) 2814–2822.
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