Effect of compression direction on the dynamic recrystallization behavior of continuous columnar-grained CuNi10Fe1Mn alloy

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• 作者：Yong-kang Liu ; Hai-you Huang ; Jian-xin Xie
• 关键词：copper–nickel alloys ; columnar grains ; compressive deformation ; dynamic recrystallization ; grain boundaries
• 刊名：International Journal of Minerals, Metallurgy, and Materials
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：22
• 期：8
• 页码：851-859
• 全文大小：9,676 KB
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• 作者单位：Yong-kang Liu (1)
  Hai-you Huang (1) (2)
  Jian-xin Xie (1) (2)
  
  1. Key Laboratory for Advanced Materials Processing of the Ministry of Education, Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China
  2. Beijing Laboratory of Metallic Materials and Processing for Modern Transportation, Beijing, 100083, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Materials Science
  Metallic Materials
  Mineral Resources
  
• 出版者：Journal Publishing Center of University of Science and Technology Beijing, in co-publication with Sp
• ISSN：1869-103X

文摘

The dynamic recrystallization (DRX) behavior of continuous columnar-grained (CCG) CuNi10Fe1Mn alloy was investigated by hot compression along the solidification direction (SD) and perpendicular to the solidification direction (PD). Specimens were compressed to a true strain of 0.8 at temperatures ranging from 25°C to 900°C and strain rates ranging from 0.01 to 10 s?. The results indicate that DRX nucleation at grain boundaries (GBs) and DRX nucleation at slip bands (SBs) are the two main nucleation modes. For SD specimens, C-shaped bending and zig-zagging of the GBs occurred during hot compression, which made DRX nucleation at the GBs easier than that at the SBs. When lnZ ?37.4 (Z is the Zener–Hollomon parameter), DRX can occur in SD specimens with a critical temperature for the DRX onset of ~650°C and a thermal activated energy (Q) of 313.5 kJ·mol?. In contrast, in PD specimens, the GBs remained straight, and DRX nucleation occurred preferentially at the SBs. For PD specimens, the critical temperature is about 700°C, Q is 351.7 kJ·mol?, and the occurrence condition of DRX is lnZ ?40.1. The zig-zagging of GB morphology can significantly reduce the nucleation energy at the GBs; as a result, DRX nucleation occurs more easily in SD specimens than in PD specimens.