AI Article Synopsis
- Fluctuation electron microscopy reveals that minor changes in composition can significantly affect the medium-range order in bulk metallic glasses of CuZrAl(Ag).
- Nanodiffraction patterns indicate that medium-range order in these glasses exhibits crystal-like motifs reminiscent of the B2 CuZr structure, showing similarities with its high-temperature crystalline phase.
- While increasing Ag concentration results in subtle effects on medium-range order, a higher Ag content leads to more diverse structural motifs and a decrease in dominant clusters, which supports the destabilization of the B2 structure and enhances glass-forming ability.
Article Abstract
Fluctuation electron microscopy of bulk metallic glasses of CuZrAl(Ag) demonstrates that medium-range order is sensitive to minor compositional changes. By analyzing nanodiffraction patterns medium-range order is detected with crystal-like motifs based on the B2 CuZr structure and its distorted structures resembling the martensitic ones. This result demonstrates some structural homology between the metallic glass and its high temperature crystalline phase. The amount of medium-range order seems slightly affected with increasing Ag concentration (0, 2, 5 at.%) but the structural motifs of the medium-range ordered clusters become more diverse at the highest Ag concentration. The decrease of dominant clusters is consistent with the destabilization of the B2 structure measured by calorimetry and accounts for the increased glass-forming ability.
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Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5359623 | PMC |
| http://dx.doi.org/10.1038/srep44903 | DOI Listing |
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