Effect of Plastic Anisotropy on the Kinetics of Static Softening in AA2024–T3 Aluminum Alloy

Houria, Manel; Matougui, N.; Mehdi, Brahim; Kherrouba, Nabil; Jahazi, Mohammad

doi:10.1007/s12540-021-01126-z

Cited by 5 publications

(1 citation statement)

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“…Only small deviations between true stress-strain curves for the different specimen orientations were observed, and it was concluded that the material was isotropic. Houria et al [13] performed tensile tests at a strain rate of 0.0005 s −1 on specimens cut out along the 0 • , 45 • , and 90 • directions of a 0.6 mm thick plate. The tests showed anisotropic properties.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Strain Rate and Anisotropy on the Formability and Mechanical Behaviour of Aluminium Alloy 2024-T3

Harant,

Verleysen,

Forejt

et al. 2024

Metals

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The present study focuses on the mechanical behaviour and formability of the aluminium alloy 2024-T3 in sheet form with a thickness of 0.8 mm. For this purpose, tensile tests at quasi-static and intermediate strain rates were performed using a universal testing machine, and high strain rate experiments were performed using a split Hopkinson tension bar (SHTB) facility. The material’s anisotropy was investigated by considering seven different specimen orientations relative to the rolling direction. Digital image correlation (DIC) was used to measure specimen deformation. Based on the true stress–strain curves, the alloy exhibited negative strain rate sensitivity (NSRS). Dynamic strain aging (DSA) was investigated as a possible cause. However, neither the strain distribution nor the stress–strain curves gave further indications of the occurrence of DSA. A higher deformation capacity was observed in the high strain rate experiments. The alloy displayed anisotropic mechanical properties. Values of the Lankford coefficient lower than 1, more specifically, varying between 0.45 and 0.87 depending on specimen orientations and strain rate, were found. The hardening exponent was not significantly dependent on specimen orientation and only moderately affected by strain rate. An average value of 0.183 was observed for specimens tested at a quasi-static strain rate. Scanning electron microscopy (SEM) revealed a typical ductile fracture morphology with fine dimples. Dimple sizes were hardly affected by specimen orientation and strain rate.

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Section: Introductionmentioning

confidence: 99%