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王翠萍,黄剑洪,卢勇,刘兴军.Co-Ti合金中γ相粗化动力学的实验研究和相场模拟[J].稀有金属材料与工程(英文),2019,48(9):2799~2807.[wangcuiping,huangjianhong,luyong and liuxingjun.Experimental Research and Phase-field Simulation of Coarsening Kinetics of γ Precipitates in Co-Ti Alloys[J].Rare Metal Materials and Engineering,2019,48(9):2799~2807.]
Experimental Research and Phase-field Simulation of Coarsening Kinetics of γ Precipitates in Co-Ti Alloys
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Received:March 14, 2018  Revised:May 04, 2018
DOI:
Key words: Co-19.7Ti alloy  Phase-field method  Coarsening kinetics  Temperature
Foundation item:国家重点研发计划,科技部国际科技合作专项
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wangcuiping,huangjianhong,luyong and liuxingjun  
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Abstract:
      The microstructure evolution and coarsening behaviors of disordered γ phase in the inverse Co-19.7Ti alloy have been investigated by experiment and phase-field method. Both the experimental and simulated results show that the morphologies of γ particles evolved from near-circular shape to plate-like shape as the aging time increases. The coarsening kinetics for the mean particle size obeys the cube law r3 = kt, and it can be obtained as: . There exist two distinct stages of the mean particle sizes increase versus aging time, the growth rate is dramatically larger in stage I and has a relatively slower increase in stage II. The summit value of precipitate size distributions become larger and the breadth of the distributions decrease from 700oC to 750oC, the simulated results reproduce well the experimental results.