Growth rate and composition of directionally solidified intermetallic TiAl–Nb alloys with different solidification conditions

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• 作者：Li-Wei Zhang ; Jun-Pin Lin ; Xiang-Jun Xu ; Jian-Ping He ; Xian-Fei Ding…
• 关键词：TiAl–Nb alloys ; Intermetallic ; Directional solidification ; Microstructural parameters ; Solute concentration
• 刊名：Rare Metals
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：35
• 期：1
• 页码：54-64
• 全文大小：4,309 KB
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• 作者单位：Li-Wei Zhang (2)
  Jun-Pin Lin (2)
  Xiang-Jun Xu (3)
  Jian-Ping He (2)
  Xian-Fei Ding (1)
  Xiao-Ou Jin (4)
  
  2. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China
  3. Materials and Chemistry School, Zhongyuan University of Technology, Zhengzhou, 450007, China
  1. National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing, 100083, China
  4. School of Architecture and Engineering, Heilongjiang University, Harbin, 150080, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Metallic Materials
  Chinese Library of Science
  
• 出版者：Journal Publishing Center of University of Science and Technology Beijing, in co-publication with Sp
• ISSN：1867-7185

文摘

Intermetallic Ti–xAl–8Nb (x = 41, 43, 45, 47, 49; at%) alloys were solidified unidirectionally upwards with a constant temperature gradient of G = 3.8 K·mm−1 at wide range of growth rates of v = 10–400 μm·s−1 using a Bridgman directional solidification (DS) furnace. Microstructural parameters including the primary dendrite arm spacing (λ ₁), secondary dendrite arm spacing (λ ₂), dendrite tip radius (R) and mushy zone depth (d) were measured statistically. The values of λ ₁, λ ₂, R and d decrease as the growth rate increases for a given composition (x). The values of λ ₁, λ ₂, R and v increase with the increase in x value, while the value of d firstly increases and then decreases with the increase in x value for a given v. The relationships between λ ₁, λ ₂ and R were analyzed by the linear regression. The average growth rate exponent of λ ₁ is 0.29, which is in accordance with the previous experimental observations, and that of λ ₂ is close to the previous experimental results, while those of R and d are lower than the results in other alloy systems. In addition, theoretical models for λ ₁, λ ₂ and R were compared with the experimental observations, and a comparison of the present experimental results with the theoretical models and previous experimental results was also made.