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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
PubMed
Summary
This summary is machine-generated.

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.

Keywords:
aluminum alloyhigh-temperature compressionsubgrain size modelsubstructure evolution

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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.