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<p>In this work, notched tensile specimens representing stress triaxialities ranging from 0.51 to 0.38 are tested at temperatures from 100 to 250&#xa0;°C and strain rates from 0.001 to 1&#xa0;s<sup>−1</sup>. Effect of deformation parameters and stress state on microstructure evolution, damage and fracture in 2219 Al alloy during warm deformation are investigated. A modified Gurson-Tvergaard-Needleman (GTN) model is developed, accounting for the effects of deformation parameters and stress triaxiality. Dynamic recovery dominates the softening process, and the grain shape evolves from oblate to equiaxed with increasing temperature or decreasing strain rate. Void nucleation partially inhibits recrystallization. The primary fracture mechanism is transgranular fracture due to void coalescence, with some local cleavage fracture. Fracture surfaces change from bright shear features to fibrous ones as deformation condition varies. The modified GTN model effectively predicts damage progression in 2219 Al alloy during warm deformation.</p> Graphical Abstract <p></p>

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Tensile Fracture Characteristics and a Modified GTN Model Incorporating Deformation Conditions and Stress Triaxiality for a Solution 2219 Al Alloy

  • 期刊论文

  • 发表日期：

    2026年3月17日

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  • Hui-Jie Zhang,
  • Y. C. Lin,
  • Jin-Chuan Long,
  • Dao-Guang He,
  • Jun-Quan Wang,
  • Song Zhang,
  • Zi-Jian Chen

摘要

In this work, notched tensile specimens representing stress triaxialities ranging from 0.51 to 0.38 are tested at temperatures from 100 to 250 °C and strain rates from 0.001 to 1 s−1. Effect of deformation parameters and stress state on microstructure evolution, damage and fracture in 2219 Al alloy during warm deformation are investigated. A modified Gurson-Tvergaard-Needleman (GTN) model is developed, accounting for the effects of deformation parameters and stress triaxiality. Dynamic recovery dominates the softening process, and the grain shape evolves from oblate to equiaxed with increasing temperature or decreasing strain rate. Void nucleation partially inhibits recrystallization. The primary fracture mechanism is transgranular fracture due to void coalescence, with some local cleavage fracture. Fracture surfaces change from bright shear features to fibrous ones as deformation condition varies. The modified GTN model effectively predicts damage progression in 2219 Al alloy during warm deformation.

Graphical Abstract