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Subgrain Size Modeling and Substructure Evolution in an AA1050 Aluminum Alloy during High-Temperature Compression
Qi Yang1, Tomasz Wojcik1, Ernst Kozeschnik1
1Institute of Materials Science and Technology, TU Wien, Getreidemarkt 9, 1060 Vienna, Austria.
Materials (Basel, Switzerland)
|September 14, 2024
Summary
Dynamic recovery and recrystallization in aluminum alloys refine subgrains during plastic deformation. This study models subgrain size evolution under varying compression, providing accurate predictions for material behavior.
Area of Science:
- Materials Science
- Metallurgy
- Mechanical Engineering
Background:
- High stacking fault energy (SFE) materials like aluminum alloys utilize dynamic recovery (DRV) and dynamic recrystallization (DRX) for softening during plastic deformation.
- These mechanisms promote the continuous generation and refinement of subgrains, crucial for understanding material behavior under stress.
Purpose of the Study:
- To investigate the influence of compression parameters on substructure evolution in 1050 aluminum alloy at elevated temperatures.
- To develop and validate models for predicting average subgrain size evolution during high-temperature plastic deformation.
Main Methods:
- Experimental investigation of 1050 aluminum alloy microstructure under compression at temperatures from 300 °C to 500 °C and strain rates from 0.01 to 0.1 s⁻¹.
- Application and comparison of two independent average subgrain size evolution models: an empirical model and a substructure-based model.
- Incorporation of a dislocation density evolution model within the substructure-based model to simulate subgrain refinement and thermal coarsening.
Main Results:
- Experimental data on average subgrain size were obtained under various compression conditions.
- The substructure-based model demonstrated high accuracy, with a correlation coefficient (R) of 0.98 and a root mean square error (RMSE) of 5.7%.
- Both models successfully reproduced the expected subgrain size evolution using physically meaningful variables.
Conclusions:
- Compression parameters significantly influence substructure evolution and subgrain refinement in 1050 aluminum alloy at elevated temperatures.
- The developed substructure-based model accurately predicts average subgrain size evolution, incorporating physical variables.
- These models offer reliable estimations of subgrain size, valuable for predicting material performance during continuous deformation.
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