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Article Dans Une Revue Journal of Materials Processing Technology Année : 2022

Mechanisms and kinetics of pore closure in thick aluminum plate

Résumé

Interrupted in situ tests at high temperature characterized with X-ray microtomography were employed to study porosity evolution under loading conditions representative of aluminum hot rolling. Coupling digital volume correlation and simulations, it is possible to access, for each pore, its morphological evolution, and the mechanical fields it experienced. The closure kinetics of hundreds of pores were studied, which is described as the pore volume as a function of the hydrostatic integration. Closure kinetics are a function of the shape of the pore. Focus is put on pores with a complex shape which are more detrimental to mechanical properties. Their closure kinetics are exponential due to the pore fragmentation during closure. The closure of complex pores is fostered by an initial orientation perpendicular to the loading direction and a low initial fragmentation. Based on the closure kinetics of 243 complex pores, a new pore closure model is proposed.

Domaines

Matériaux
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Dates et versions

hal-03611170 , version 1 (16-03-2022)

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P. Gravier, F. Mas, A. Barthelemy, E. Boller, L. Salvo, et al.. Mechanisms and kinetics of pore closure in thick aluminum plate. Journal of Materials Processing Technology, 2022, 303, pp.117499. ⟨10.1016/j.jmatprotec.2022.117499⟩. ⟨hal-03611170⟩
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