Amorphous CuxZry Alloys
- Practical Electron Microscopy and Database -
- An Online Book -

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This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers.
 

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Figure 3373a shows HRTEM images of an amorphous Cu60Zr20Ti20 specimen formed by melt-spinning [1]. The bright and dark contrast of the interconnected network indicates a compositional inhomogeneity in the materials, indicating a tendency of phase separation. In the FFT (fast Fourier transform) patterns, two halos corresponding to two different near-neighbor distances represent a phase separation of the glass. The maxima with a d-spacing of 0.21 nm correspond to 410 plane of Cu51Zr14 (Cu rich Zr poor region), while the maxima with a d-spacing of 0.243 nm correspond to 111 plane of Zr2Cu phase (Zr rich Cu poor regions).

amorphous Cu60Zr20Ti20 specimen

Figure 3373a. High resolution TEM (HRTEM) images and the corresponding FFT patterns (inset) from two different regions of an amorphous Cu60Zr20Ti20 alloy obtained by melt-spinning. [1]

The spectrum of elemental copper has no white lines because of its fully occupied 3d band as shown in Figure 3373b.

EEL spectra of Cu-L2,3 edge. CuZr represents amorphous Cu60Zr40 alloy, while Cu represents pure copper

Figure 3373b. EEL spectra of Cu-L2,3 edge. CuZr represents amorphous Cu60Zr40 alloy, while Cu represents pure copper. [2]

 

 

 

 

 

 

 

 

[1] S. Vincent, Joysurya Basu, B.S. Murty, Jatin Bhatt, Micro indentation study on Cu60Zr20Ti20 metallic glass, Materials Science and Engineering A, 550 (2012) 160– 166.
[2] Pearson, D. H. and Fultz, B. and Ahn, C. C. Measurements of 3d state occupancy in transition metals using electron energy loss spectrometry. Applied Physics Letters, 53 (15), (1988) 1405-1407.

 

 

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