Fang, J. X. ; Vainio, U. ; Puff, W. ; Würschum, R. ; Wang, X. L. ; Wang, D. ; Ghafari, M. ; Jiang, F. ; Sun, J. ; Hahn, H. ; Gleiter, H. (2012)
Atomic Structure and Structural Stability of Sc75Fe25Nanoglasses.
In: Nano Letters, 12 (1)
doi: 10.1021/nl2038216
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Nanoglasses are solids consisting of nanometer-sized glassy regions connected by interfaces having a reduced density. We studied the structure of Sc75Fe25 nanoglasses by electron microscopy, positron annihilation spectroscopy, and small-/wide-angle X-ray scattering. The positron annihilation spectroscopy measurements showed that the as-prepared nanoglasses consisted of 65 vol% glassy and 35 vol% interfacial regions. By applying temperature annealing to the nanoglasses and measuring in situ small-angle X-ray scattering, we observed that the width of the interfacial regions increased exponentially as a function of the annealing temperature. A quantitative fit to the small-angle X-ray scattering data using a Debye–Bueche random phase model gave a correlation length that is related to the sizes of the interfacial regions in the nanoglass. The correlation length was found to increase exponentially from 1.3 to 1.7 nm when the sample temperature was increased from 25 to 230 °C. Using simple approximations, we correlate this to an increase in the width of interfacial regions from 0.8 to 1.2 nm, while the volume fraction of interfacial regions increased from 31 to 44%. Using micro-compression measurements, we investigated the deformation behavior of ribbon glass and the corresponding nanoglass. While the nanoglass exhibited a remarkable plasticity even in the annealed state owing to the glass-glass interfaces, the corresponding ribbon glass was brittle. As this difference seems not limited to Sc75Fe25 glasses, the reported result suggest that nanoglasses open the way to glasses with high ductility resulting from the nanometer sized microstructure.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2012 |
| Autor(en): | Fang, J. X. ; Vainio, U. ; Puff, W. ; Würschum, R. ; Wang, X. L. ; Wang, D. ; Ghafari, M. ; Jiang, F. ; Sun, J. ; Hahn, H. ; Gleiter, H. |
| Art des Eintrags: | Bibliographie |
| Titel: | Atomic Structure and Structural Stability of Sc75Fe25Nanoglasses |
| Sprache: | Englisch |
| Publikationsjahr: | 11 Januar 2012 |
| Verlag: | ACS Publications |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Nano Letters |
| Jahrgang/Volume einer Zeitschrift: | 12 |
| (Heft-)Nummer: | 1 |
| DOI: | 10.1021/nl2038216 |
| Kurzbeschreibung (Abstract): | Nanoglasses are solids consisting of nanometer-sized glassy regions connected by interfaces having a reduced density. We studied the structure of Sc75Fe25 nanoglasses by electron microscopy, positron annihilation spectroscopy, and small-/wide-angle X-ray scattering. The positron annihilation spectroscopy measurements showed that the as-prepared nanoglasses consisted of 65 vol% glassy and 35 vol% interfacial regions. By applying temperature annealing to the nanoglasses and measuring in situ small-angle X-ray scattering, we observed that the width of the interfacial regions increased exponentially as a function of the annealing temperature. A quantitative fit to the small-angle X-ray scattering data using a Debye–Bueche random phase model gave a correlation length that is related to the sizes of the interfacial regions in the nanoglass. The correlation length was found to increase exponentially from 1.3 to 1.7 nm when the sample temperature was increased from 25 to 230 °C. Using simple approximations, we correlate this to an increase in the width of interfacial regions from 0.8 to 1.2 nm, while the volume fraction of interfacial regions increased from 31 to 44%. Using micro-compression measurements, we investigated the deformation behavior of ribbon glass and the corresponding nanoglass. While the nanoglass exhibited a remarkable plasticity even in the annealed state owing to the glass-glass interfaces, the corresponding ribbon glass was brittle. As this difference seems not limited to Sc75Fe25 glasses, the reported result suggest that nanoglasses open the way to glasses with high ductility resulting from the nanometer sized microstructure. |
| Freie Schlagworte: | Nanoglass, metallic glass, small-angle X-ray scattering, wide-angle X-ray scattering, positron annihilation spectroscopy, interface delocalization, mechanical property |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Gemeinschaftslabor Nanomaterialien 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 16 Jun 2014 11:58 |
| Letzte Änderung: | 16 Jun 2014 11:58 |
| PPN: | |
| Sponsoren: | This work was supported by the Deutsche Forschungsgemein- schaft (DFG) under contract HA 1344/23-1., We thank Alexander-von- Humboldt Foundation for a fellowship, and the NES Program at KIT for support. , .X. Fang was supported by National Natural Science Foundation of China (No. 51171139), Doctoral Fund for New Teachers (No.20110201120039), Tengfei Talent Project of Xi ’ an Jiaotong University, the New Century Excellent Talents in University (NCET)., And the Fundamental Research Funds for the Central Universities (No 08142008), F. Jiang was supported by the National Natural Science Foundation of China under Grant Nos.50871079., J. Sun also wish to express his special thanks for the support from the National Basic Research Program of China (Grant No. 2010CB631003) as well as 111 Project of China (B06025)., We also thank the support from the XJTU Center for Advancing Materials Performance from the Nanoscale. |
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