Crystallization Kinetics and Phase Transformation Mechanisms in Cu56Zr44 Glassy Alloy

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• 作者：Ilkay Kalay ; Matthew J. Kramer…
• 刊名：Metallurgical and Materials Transactions A
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：46
• 期：8
• 页码：3356-3364
• 全文大小：1,632 KB
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• 作者单位：Ilkay Kalay (1)
  Matthew J. Kramer (2) (3)
  Ralph E. Napolitano (2) (3)
  
  1. Department of Materials Science and Engineering, Cankaya University, 06790, Ankara, Turkey
  2. Department of Materials Science and Engineering, Iowa State University, Ames, IA, 50011, USA
  3. Materials Sciences and Engineering, Ames Laboratory, U.S. Department of Energy, Ames, IA, 50011, USA
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Metallic Materials
  Structural Materials
  Physical Chemistry
  Ceramics,Glass,Composites,Natural Materials
  
• 出版者：Springer Boston
• ISSN：1543-1940

文摘

The kinetics and phase selection mechanisms involved in the crystallization of an amorphous Cu-Zr alloy of eutectic composition (Cu56Zr44) were investigated using in situ high-energy X-ray diffraction (HEXRD), transmission electron microscopy (TEM), and differential scanning calorimetry (DSC) under isothermal and constant heating rate conditions. In situ HEXRD results for 10?K/min (10?°C/min) heating indicate that the amorphous alloy devitrifies into CuZr2 and mainly Cu10Zr7 at the crystallization temperature of 725?K (452?°C). The sequence continues with the precipitation of CuZr (B2) at 1004?K (731?°C), where these three phases coexist until the decomposition of CuZr2 is observed at 1030?K (757?°C). The two equilibrium phases Cu10Zr7 and CuZr (B2) remain present on further heating until melting at the eutectic temperature for the Cu56Zr44 alloy. TEM investigation of the isothermal [705?K (432?°C)] crystallization sequence reveals primary nucleation and growth of the Cu10Zr7 phase, where growth of the Cu10Zr7 crystals is initially planar with a transition to a cellular morphology, associated with partitioning of Zr at the growth front. Related cellular structures and composition profiles are quantified.