Calorimetric signature of the Portevin–Le Châtelier effect in an aluminum alloy from infrared thermography measurements and heat source reconstruction

Delpueyo, D.; Balandraud, Xavier; Grédiac, Michel

doi:10.1016/j.msea.2015.10.053

Cited by 18 publications

(19 citation statements)

References 39 publications

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“…Further deformation proceeds by propagation (B) of the single band across the gauge length. This is accompanied by very small serrations of the stress signal, most likely due to dislocation particle interactions at the reaction front of the deformation band [42]. Interestingly, no secondary PLC band nucleation is observed, confirming that the PLC effect observed here is not of type B.…”

Section: Strain Rate Jump In Ssupporting

confidence: 67%

“…Strain values during these tests were determined from the crosshead displacement data of the tensile testing machine. Localized deformation can be documented by diffraction methods, 2D or 3D local strain mapping as well as by infrared thermal imaging methods [39][40][41][42][43][44]. In the present study, the local deformation behavior of the investigated material conditions was characterized in greater detail by additional tensile tests in combination with digital image correlation (DIC).…”

Section: Introductionmentioning

confidence: 94%

“…Finally, a highly sensitive unidirectional stereo microphone (XYH-6 X/Y Capsule by Zoom™, Hauppauge, NY, USA, 24 bit, up to 96 kHz) was used in the same setup ( Figure 2) to measure acoustic emission signals (as integral acoustic intensity) based on earlier reports on acoustic emission related to PLC effects [2,3,15,18,[45][46][47]. Localized deformation can be documented by diffraction methods, 2D or 3D local strain mapping as well as by infrared thermal imaging methods [39][40][41][42][43][44]. In the present study, the local deformation behavior of the investigated material conditions was characterized in greater detail by additional tensile tests in combination with digital image correlation (DIC).…”

Section: Introductionmentioning

confidence: 99%

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On the PLC Effect in a Particle Reinforced AA2017 Alloy

Härtel¹,

Illgen²,

Frint³

et al. 2018

Metals

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Abstract:The Portevin-Le Châtelier (PLC) effect often results in serrated plastic flow during tensile testing of aluminum alloys. Its magnitude and characteristics are often sensitive to a material's heat treatment condition and to the applied strain rate and deformation temperature. In this study, we analyze the plastic deformation behavior of an age-hardenable Al-Cu alloy (AA2017) and of a particle reinforced AA2017 alloy (10 vol. % SiC) in two different conditions: solid solution annealed (W) and naturally aged (T4). For the W-condition of both materials, pronounced serrated flow is observed, while both T4-conditions do not show distinct serrations. It is also found that a reduction of the testing temperature (−60 • C, −196 • C) shifts the onset of serrations to larger plastic strains and additionally reduces their amplitude. Furthermore, compressive jump tests (with alternating strain rates) at room temperature confirm a negative strain rate sensitivity for the W-condition. The occurring PLC effect, as well as the propagation of the corresponding PLC bands in the W-condition, is finally characterized by digital image correlation (DIC) and by acoustic emission measurements during tensile testing. The formation of PLC bands in the reinforced material is accompanied by distinct stress drops as well as by perceptible acoustic emission, and the experimental results clearly show that only type A PLC bands occur during testing at room temperature (RT).

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Section: Strain Rate Jump In Ssupporting

confidence: 67%

Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

On the PLC Effect in a Particle Reinforced AA2017 Alloy

Härtel¹,

Illgen²,

Frint³

et al. 2018

Metals

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“…Certainly, after the PLC band passage and the corresponding jump in equivalent strain and temperature, the material should deform purely elastically and therefore absorb heat. This was previously observed under uniaxial loading conditions by using quantitative calorimetry in (38). To assess the relative contribution of heat diffusion and thermoelastic coupling to temperature drops, a calorimetric analysis has been carried out.…”

Section: Mechanical Responsementioning

confidence: 91%

“…To our best knowledge, only studies (37) and (38) provide heat source distributions induced by PLC effects in a metallic material. The characterization tests were performed under uniaxial tensile loading conditions.…”

Section: Introductionmentioning

confidence: 99%

Calorimetric analysis of Portevin-Le Chatelier bands under equibiaxial loading conditions in Al–Mg alloys: Kinematics and mechanical dissipation

Cam

Robin

Leotoing

et al. 2017

Mechanics of Materials

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International audienceThis paper investigates the thermomechanical behavior of Al–Mg alloys submitted to equibiaxial loading until failure. More particularly, the study aims to characterize calorimetric signature accompanying the formation and propagation of Portevin-Le Chatelier (PLC) bands induced by such a loading condition. Digital Image Correlation (DIC) and infrared thermography (IRT) on both sides of a cruciform shaped specimen were performed in order to characterize full kinematic and thermal fields on the specimen surface. Heat source field was reconstructed from the temperature field and the heat diffusion equation. The heat source map enables us to visualize spatio-temporal gradients in the calorimetric response of the material and to investigate the kinematics of PLC bands induced by equibiaxial tensile loading. At the specimen center, the heat source exhibits jumps that fit with jumps of temperature and equivalent deformation rate. Until a 30% equivalent strain rate is reached, these jumps are due to repeatable PLC band propagation in the two perpendicular loading directions. In certain cases, heat source maps may be seen as mechanical dissipation maps

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