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Abnormal grain growth in nonequilibrium systems: effects of point defect patterning
Vasyl O Kharchenko1, Dmitrii O Kharchenko1
1Institute of Applied Physics, National Academy of Sciences of Ukraine, 58 Petropavlovskaya Street, 40000 Sumy, Ukraine.
Summary
This study models abnormal grain growth, finding that increased irradiation slows grain growth dynamics. Power-law time asymptotics describe these processes, influenced by competing deterministic and stochastic mechanisms.
Area of Science:
- Materials Science
- Physics
- Chemical Engineering
Background:
- Abnormal grain growth is a critical phenomenon in materials processing.
- Understanding the interplay of deterministic and stochastic mechanisms is key.
- Grain mobility's dependence on grain size influences growth dynamics.
Purpose of the Study:
- To develop a mean-field model for abnormal grain growth.
- To investigate the impact of irradiation on grain growth dynamics.
- To analyze grain size distributions under competing growth mechanisms.
Main Methods:
- Developed a mean-field model incorporating size-dependent grain mobility.
- Applied the model to study grain growth in irradiated materials using swelling rate theory.
- Analyzed the influence of irradiation dose on growth kinetics.
Main Results:
- Increased irradiation dose significantly slows down grain growth.
- Power-law time asymptotics characterize the observed grain growth processes.
- Grain size distributions exhibit complex behavior due to competing mechanisms.
Conclusions:
- The developed model accurately captures delayed grain growth under irradiation.
- Irradiation acts as a retarding factor for grain growth.
- Further research into fluctuation mechanisms is warranted for a complete understanding.
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