Effect of Growth Rate and Composition on the Eutectic Spacing in the Directionally Solidified NiAl-Mo Eutectic Alloys

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• 作者：JianFei Zhang ; Jun Shen ; HuiPing Ren ; JiChun Yang ; Lin Chen ; ZiLi Jin ; ZhenLiang Li…
• 刊名：JOM Journal of the Minerals, Metals and Materials Society
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：67
• 期：8
• 页码：1886-1895
• 全文大小：4,024 KB
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• 作者单位：JianFei Zhang (1)
  Jun Shen (2)
  HuiPing Ren (1)
  JiChun Yang (1)
  Lin Chen (1)
  ZiLi Jin (1)
  ZhenLiang Li (1)
  XueLing Zhao (3)
  
  1. College of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Bao’tou, 014010, China
  2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, China
  3. CNGC Inner Mongolia First Machinery Group, No. 10 Sub-company, Bao’tou, 014030, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Metallic Materials
  Nanotechnology
  Crystallography
  
• 出版者：Springer Boston
• ISSN：1543-1851

文摘

A series of stoichiometric NiAl alloys contain four different concentrations of Mo (7.8, 9, 13, 16 at.%) were directionally solidified in the Bridgman-type directional solidification furnace for four different growth rates (V?=?1.5-?μm/s) in a constant temperature gradient (G?=?334?K/cm). the microstructures of the alloys produced with the different growth rates at a constant temperature gradient tended to form fully fibrous structures. The fiber spacings λ were measured from transverse section of the specimen. The variation of λ with respect to growth rate (V) and composition (C 0) were determined by linear regression analysis. It has been found that λ decreases with the increasing values of V and C 0. The results are compared with theoretical models and previous experimental published data.