Journal
RARE METALS
Volume 38, Issue 11, Pages 1062-1069Publisher
NONFERROUS METALS SOC CHINA
DOI: 10.1007/s12598-018-1169-9
Keywords
Coarsening behavior; (Ni, Co)(2)Si particles; Coherence mismatch; LSW theory; Particle size distributions
Funding
- National Natural Science Foundation of China [51561008, 51461017]
- Jiangxi Yorth Major Natural Science Foundation [20171ACB21044, 20161BBE50030]
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The coarsening behavior of (Ni, Co)(2)Si particles in Cu-Ni-Co-Si alloy was investigated by experimental observations and coarsening kinetics calculations when aged at 450, 500, 550 and 600 degrees 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)(2)Si 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)(2)Si 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)(2)Si 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.
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