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Abstract <p>Fatigue and corrosion-fatigue tests were carried out on commercial aluminum alloys of the Al–Mg system: AMg2, AMg5, and 1570. These alloys have a coarse-grained deformed microstructure with two types of inclusions oriented along the rolling axis. Fatigue tests were carried out at room temperature, using a bending-rotation scheme in air and in a 3% aqueous NaCl solution. Fatigue curves for tests in air and in a corrosive environment can be described using the Basquin equation and a crack tip plastic deformation model. Reduced fatigue limits (σ<sub>–1</sub>) of commercial Al–Mg alloys during fatigue tests in air are due to the presence of micron-sized inclusions. When tested in air, an increase in the strength of Al–Mg alloys is accompanied by an increase in σ<sub>–1</sub> and a slight decrease in the fatigue curve slope (an increase in the plastic deformation activation energy at the crack tip Δ<i>F</i>/<i>kT</i>). The decrease in σ<sub>–1</sub> and Δ<i>F</i>/<i>kT</i> during corrosion-fatigue testing of Al–Mg alloys is due to the Rehbinder effect and the occurrence of corrosion defects on the surface of aluminum alloys, primarily pitting and crack-like defects of intergranular corrosion on β-phase particles that form microgalvanic pairs with a crystal lattice.</p>

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Study of Corrosion-Fatigue Fracture of Industrial Aluminum Alloys Al–Mg

  • 期刊论文

  • 发表日期：

    2026年4月26日

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  • O. A. Belkin,
  • M. K. Chegurov,
  • V. N. Chuvil’deev,
  • A. V. Nokhrin,
  • A. N. Sysoev,
  • A. V. Komel’kov,
  • N. A. Kozlova,
  • N. N. Berendeev,
  • V. D. Chupriyanova

摘要

Abstract

Fatigue and corrosion-fatigue tests were carried out on commercial aluminum alloys of the Al–Mg system: AMg2, AMg5, and 1570. These alloys have a coarse-grained deformed microstructure with two types of inclusions oriented along the rolling axis. Fatigue tests were carried out at room temperature, using a bending-rotation scheme in air and in a 3% aqueous NaCl solution. Fatigue curves for tests in air and in a corrosive environment can be described using the Basquin equation and a crack tip plastic deformation model. Reduced fatigue limits (σ–1) of commercial Al–Mg alloys during fatigue tests in air are due to the presence of micron-sized inclusions. When tested in air, an increase in the strength of Al–Mg alloys is accompanied by an increase in σ–1 and a slight decrease in the fatigue curve slope (an increase in the plastic deformation activation energy at the crack tip ΔF/kT). The decrease in σ–1 and ΔF/kT during corrosion-fatigue testing of Al–Mg alloys is due to the Rehbinder effect and the occurrence of corrosion defects on the surface of aluminum alloys, primarily pitting and crack-like defects of intergranular corrosion on β-phase particles that form microgalvanic pairs with a crystal lattice.