Influence of molten status on nanoquasicrystalline-forming Zr-based metallic glasses

Fan, Cang; Chen, D.; Liaw, P. K.; Choo, H.; Benmore, C.; Siewenie, J.; Chen, G. L.; Xie, J. X.; Liu, C. T.
December 2008
Applied Physics Letters;12/29/2008, Vol. 93 Issue 26, p261905
Academic Journal
Quasicrystals, formed during the primary crystallization stage of annealing Zr70-XCu25Pt5AlX metallic glasses, decrease in size from 100 to 5 nm as the Al content is increased from 8 to 10 at. %. The glass transition and crystallization processes during annealing at fixed heating rate were found to be influenced by the thermal history of the melt. Pair distribution function analyses of neutron scattering data revealed that the broad peak from the nearest atomic pairs separates into multiple peaks with lower melt quenching temperatures (TL). These results suggest that the short-range order is enhanced with decreased TL. Such ordered regions remain in the glass upon quenching and contribute to nanoquasicrystal formation upon heating.


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