Kinetics of discontinuous precipitation in Cu᾿0Ni᾿0Mn alloy

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• 作者：Wei-bin Xie ; Qiang-song Wang ; Guo-liang Xie…
• 关键词：copper nickel manganese alloys ; microstructural evolution ; precipitation ; kinetics
• 刊名：International Journal of Minerals, Metallurgy, and Materials
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：23
• 期：3
• 页码：323-329
• 全文大小：2,251 KB
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• 作者单位：Wei-bin Xie (1)
  Qiang-song Wang (1)
  Guo-liang Xie (1)
  Xu-jun Mi (1)
  Dong-mei Liu (1)
  Xue-Cheng Gao (1)
  
  1. State Key Laboratory for Fabrication and Processing of Non-ferrous Metals, General Research Institute for Nonferrous Metals, Beijing, 100088, 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 morphology and growth kinetics of discontinuous precipitation (DP) in a Cu–20Ni–20Mn alloy were investigated in the temperature range of 523–673 K by optical microscopy, scanning electron microscopy, and transmission electron microscopy. A lamellar mixed structure consisting of alternating lamellae of a matrix and NiMn phase was observed in DP colonies. The volume fraction of regions formed by a DP reaction was determined by quantitative metallographic measurements. The kinetics of DP was evaluated on the basis of the Johnson–Mehl–Avrami–Kolmogorov equation, which resulted in a time exponent of approximately 1.5. We confirmed that the nucleation of the discontinuous precipitate was confined to grain edges or boundaries at an early stage of the reaction. The activation energy of DP process was determined to be approximately (72.7 ± 7.2) kJ/mol based on the Arrhenius equation; this result suggests that DP is controlled by grain boundary diffusion. The hardness values exhibited good correlation with the volume fraction of DP; this correlation was attributed to the presence of the ordered NiMn phase.