Solidification microstructure characteristics of Ti᾿4Al᾿Nb᾿Cr᾿.1B alloy under various cooling rates during mushy zone

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• 作者：Peng Han ; Hong-Chao Kou ; Jie-Ren Yang ; Guang Yang ; Jin-Shan Li
• 关键词：β ; solidifying TiAl alloy ; Cooling rate ; Mushy zone ; Solidification microstructure
• 刊名：Rare Metals
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：35
• 期：1
• 页码：35-41
• 全文大小：2,347 KB
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• 作者单位：Peng Han (1)
  Hong-Chao Kou (1)
  Jie-Ren Yang (1)
  Guang Yang (1)
  Jin-Shan Li (1)
  
  1. The State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, 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

Beta-solidifying TiAl alloy has great potential in the field of aero-industry as a cast alloy. In the present work, the influence of cooling rate during mushy zone on solidification behavior of Ti–44Al–4Nb–2Cr–0.1B alloy was investigated. A vacuum induction heating device combining with temperature control system was used. The Ti–44Al–4Nb–2Cr–0.1B alloy solidified from superheated was melted to β phase with the cooling rates of 10, 50, 100, 200, 400 and 700 K·min−1, respectively. Results show that with the increase in cooling rate from 10 to 700 K·min−1, the colony size of α₂/γ lamella decreases from 1513 to 48 μm and the solidification segregation significantly decreases. Also the content of residual B2 phase within α₂/γ lamellar colony decreases with the increase in cooling rate. In addition, the alloy in local interdendritic regions would solidify in a hypo-peritectic way, which can be attributed to the solute redistribution and enrichment of Al element in solidification.