Rare Metals

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Coarsening behavior of (Ni, Co)2Si particles in Cu–Ni–Co–Si alloy during aging treatment

  • Xiang-Peng Xiao
  • Hai Xu
  • Jin-Shui Chen
  • Jun-Feng Wang
  • Jiao Lu
  • Jiao-Bo Zhang
  • Li-Jun Peng


The coarsening behavior of (Ni, Co)2Si particles in Cu–Ni–Co–Si alloy was investigated by experimental observations and coarsening kinetics calculations when aged at 450, 500, 550 and 600 °C for different durations. The results show that the critical particle radius for coherence mismatch is found to be 10.3 nm, and particles larger than 25 nm are generally semi-coherent. The relationship of (Ni, Co)2Si particles size and aging time follows Lifshitz, Slyosov and Wagner (LSW) theory. The particle size distributions fit well to the LSW theoretical distribution. The activation energy for (Ni, Co)2Si coarsening is accurately determined to be (216.21 ± 5.18) kJ·mol−1 when considering the effect of temperature on the solution concentrations in matrix. The coarsening of (Ni, Co)2Si particles in Cu–Ni–Co–Si alloy is controlled by diffusion of Ni, Co and Si in Cu matrix. The growth of particles for long durations suggests that vacancies can be trapped within the structure for long time despite their mobility.


Coarsening behavior (Ni, Co)2Si particles Coherence mismatch LSW theory Particle size distributions 



This work was financially supported by the National Natural Science Foundation of China (Nos. 51561008 and 51461017) and Jiangxi Yorth Major Natural Science Foundation (Nos. 20171ACB21044 and 20161BBE50030). We thank professor Rui-Qing Liu and Dr. Hang Wang for enlightening discussions.


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Copyright information

© The Nonferrous Metals Society of China and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Institute of Engineering ResearchJiangxi University of Science and TechnologyGanzhouChina
  2. 2.School of Materials Science and EngineeringJiangxi University of Science and TechnologyGanzhouChina
  3. 3.State Key Laboratory for Fabrication and Processing of Nonferrous MetalsGeneral Research Institute for Nonferrous MetalsBeijingChina

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