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

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

机构地区：[1]Institute of Engineering Research,Jiangxi University of Science and Technology,Ganzhou 341000,China [2]School of Materials Science and Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China [3]State Key Laboratory for Fabrication and Processing of Nonferrous Metals,General Research Institute for Nonferrous Metals,Beijing 100088,China

出　　处：《Rare Metals》2019年第11期1062-1069,共8页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.51561008 and 51461017);Jiangxi Yorth Major Natural Science Foundation(Nos.20171ACB21044 and 20161BBE50030)

摘　　要：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℃ 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.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℃ 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.

关 键 词：COARSENING behavior (Ni Co)2Si PARTICLES Coherence MISMATCH LSW theory Particle size distributions 

分 类 号：TG1[金属学及工艺—金属学]