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Élaboration de composites Al/B4C pour application de protection balistique

Abstract : Lightweight materials are very attractive in the global industry, and more specifically in the field of automotive and aeronautics fields. For army vehicles the reduction of the weight has increased the need for lightweight metal and ceramic armor systems ; the combination of these materials being a key element in modern packages. Nowadays, aluminum alloys are widely introduced in such systems. Increasing the mechanical properties of these alloys will automatically imply a decrease of the mass of ballistic protections. In this context, the powder metallurgy route appears promising as it allows simultaneously to nanostructure the matrix by strain hardening and to scatter properly particles reinforcements. First, the choice has been made to focus on the combination of high density and hardening precipitation of an Al-Zn-Mg alloy. Strengthening precipitates give the consolidated raw powder mechanical properties close to the ones of a commercial wrought aluminum alloy AA7020 in a T651 temper. Then the same process was optimized on a milled powder in order to preserve the fine grains obtained by high energy ball milling. Finally, B4C particles were introduced as reinforcements in the aluminum matrix to develop an ultrafine-grained metal matrix composite
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Submitted on : Tuesday, June 21, 2022 - 9:16:17 AM
Last modification on : Tuesday, October 18, 2022 - 4:30:45 AM
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  • HAL Id : tel-01758247, version 1


Hippolyte Queudet. Élaboration de composites Al/B4C pour application de protection balistique. Matériaux et structures en mécanique [physics.class-ph]. Université de Lorraine, 2017. Français. ⟨NNT : 2017LORR0060⟩. ⟨tel-01758247⟩



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