Optimal Arrangements and Local Anisotropy of {100} Guinier-Preston (GP) Zones by Parametric Dislocation Dynamics (PDD) Simulations

Stress-oriented precipitation and the resulting mechanical anisotropy have been widely studied over the decades. However, the local anisotropy of precipitates with specific orientations has been less thoroughly investigated. This study models the interaction between an edge dislocation source and {1...

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Bibliographic Details
Published in:Materials 2024-10, Vol.17 (20), p.5076
Main Authors: Zheng, Haiwei, Liu, Jianbin, Muraishi, Shinji
Format: Article
Language:English
Subjects:
Alloys
Aluminum
Aluminum base alloys
Anisotropy
Atoms & subatomic particles
Copper
Dislocation loops
Edge dislocations
Elastic anisotropy
Green's functions
Guinier Preston zone
Mechanical properties
Precipitates
Precipitation hardening
Simulation
Strengthening
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Summary:Stress-oriented precipitation and the resulting mechanical anisotropy have been widely studied over the decades. However, the local anisotropy of precipitates with specific orientations has been less thoroughly investigated. This study models the interaction between an edge dislocation source and {100} variants of Guinier-Preston (GP) zones in Al-Cu alloys using the parametric dislocation dynamics (PDD) method. Concentric geometrically necessary dislocation (GND) loops were employed to construct a line integral model for thin platelets. The simulations, conducted with our self-developed code based on Green's function method and Eshelby inclusion theory revealed distinct strengthening behavior along the strong and weak directions for 60° GP zones, demonstrating anisotropic strengthening from the perspective of elastic interactions. Furthermore, the optimal inclined arrangement of the GP zone array was determined through elastic energy calculations, and these results were corroborated by TEM observations.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma17205076