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Experimental Research and Phase-field Simulation of Coarsening Kinetics of γ Precipitates in Co-Ti Alloys
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1.College of Materials and Fujian Provincial Key Laboratory of Materials Genome;2.Department of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen

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Fund Project:

The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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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.

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[wangcuiping, huangjianhong, luyong, 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.]
DOI:10.12442/j. issn.1002-185X.20180229

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History
  • Received:March 14,2018
  • Revised:May 04,2018
  • Adopted:May 18,2018
  • Online: October 09,2019
  • Published: