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论文类型：期刊论文

发表时间：2014-09-01

发表刊物：JOURNAL OF MATERIALS SCIENCE

收录刊物：SCIE、EI

卷号：49

期号：17

页面范围：6007-6011

ISSN号：0022-2461

摘要：Crystallization of Ni60Ta40 and Ni60Nb40 metallic glasses at temperatures well below their respective calorimetric glass transition temperatures has been studied by differential scanning calorimetry, nanodiffraction, and electron microscopies. Nanometer-scaled metastable FCC phases were found to grow out from the glass structures. The Z-contrast images reveal that the nanocrystals are enriched in Ta or Nb in comparison with the surrounded amorphous structures. The experimental evidence is suggestive of the decoupled cooperative diffusion of Ni atoms in these fragile glasses.