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Title: Modeling discontinuous dynamic recrystallization containing second phase particles in magnesium alloys utilizing phase field method

Journal Article · · Computational Materials Science
 [1];  [1];  [2];  [1]; ORCiD logo [2];  [3];  [1]
  1. Univ. of Science and Technology, Beijing (China)
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  3. Univ. of Science and Technology, Beijing (China); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Pre-existing second phase particles can induce particle stimulated nucleation (PSN) and pinning effect on grain boundaries during DRX process of magnesium alloys. The interaction among pinning effect, PSN mechanism and strain-induced grain boundary migration (SIBM) nucleation mechanism imposes challenge in quantitative study of microstructure evolution. A phase field model that describes discontinuous dynamic recrystallization process considering second phase particles (PF-DDRX-SP) which mainly distribute along grain boundaries is developed. The second phase order parameter with diffusion interface is introduced to the free energy function. With considering the pinning effect of second phase particles on grain boundaries, the grain boundary energy couples the interaction between second phase and grains. The effect of second phase on dislocation density evolution is considered in the model, and the PSN and SIBM mechanism are both executed by limiting the nucleation position to the grain boundary and the second phase interface. For the validation, the initial topology consistent with initial microstructure is applied to the simulation of DRX kinetics and flow behavior of AZ80 magnesium alloy, and great reliability and accuracy of developed model is indicated. Furthermore, through the model, the microstructure evolution with different particle size and with different volume fraction of round particle during DRX process were simulated. Finally, the results show that particles with higher dispersion reduce the number of DRX nuclei, which indicate that second phase particles suppress the nucleation at grain boundaries because of the pinning effect. More importantly, the proposed model could also quantitatively predict the relationships between the parameters of second phase particles and DRX behaviors, and enable to optimize the initial second phase structure in a uniform grain structure during thermomechanical process.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE; National Natural Science Foundation of China (NSFC); Beijing Municipal Natural Science Foundation; Scientific and Technological Innovation Foundation of Shunde Graduate School
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1820976
Report Number(s):
PNNL-SA--166391
Journal Information:
Computational Materials Science, Journal Name: Computational Materials Science Vol. 200; ISSN 0927-0256
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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