4.7 Article

Evaluation of the volume fraction of nanocrystals devitrified in Al-based amorphous alloys

期刊

JOURNAL OF NON-CRYSTALLINE SOLIDS
卷 355, 期 4-5, 页码 235-238

出版社

ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnoncrysol.2008.12.001

关键词

Amorphous metals, metallic glasses; Crystallization

资金

  1. National Natural Science Foundation of China [50471075, 50471076]
  2. National Key Basic Research Program of China [2007CB613906]
  3. National Postdoctoral Science Foundation of China [20060400956]

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An evaluation of fcc-Al volume fractions (V-f) in Al90Ni5Nd5 and Al85Ni5Y6Co2Fe2 nanostructured composites has been made by differential scanning calorimetry (DSC) and X-ray diffraction (XRD) methods. For the Al90Ni5Nd5 alloy, there exhibited lower V-f values obtained by DSC than that by XRD due to increased interface energy and the overlapping of primary crystallization and structural relaxation features during nanocrystallization process. For the Al(85)Ni(5)y(6)Co(2)Fe(2) alloy, the V-f values calculated by both methods showed good agreements at low crystallinities, but apparent differences are observed at high crystallinities. This is due to compositional variations in the remaining amorphous matrix during devitrification. (C) 2008 Elsevier B.V. All rights reserved.

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