Abstract
This work investigated the weldability of AA1100–16B4C (vol.-%) metal matrix composite using laser welding and friction stir welding (FSW). The microstructure and mechanical properties of joints produced by two welding techniques were compared. For laser welding, a large amount of brittle needle-like phases, together with some residues of B4C particles were observed in the fusion zone of the joint. The use of Ti filler can improve the microstructure and increase the joint efficiency from 63 to 75%. On the other hand, the FSW, being a solid state welding technique, was interesting as it minimised the formation of brittle intermetallic phases. In addition, the breakage of B4C particles and the grain refinement of the matrix were observed in the weld zone. The FSW joints show superior mechanical properties than the laser welded joints. Up to 100% joint efficiency can be achieved by FSW for annealed AA1100–16B4C materials.Ce travail a examiné la soudabilité du composite à matrice métallique AA1100-16B4C (% en vol) en utilisant le soudage au laser et le soudage par friction-malaxage (FSW). On a comparé la microstructure et les propriétés mécaniques des joints produits par les deux techniques de soudage. Pour le soudage au laser, on a observé une grande quantité de phases fragiles en forme d'aiguille ainsi que des résidus de particules de B4C, dans la zone de fusion du joint. L'utilisation de métal d'apport de Ti peut améliorer la microstructure et augmenter l'efficacité du joint de 63 à 75%. D'un autre côté, le FSW, une technique de soudage à l'état solide, était intéressant puisqu'il minimisait la formation de phases intermétalliques fragiles. De plus, on a observé, dans la zone de soudure, la rupture des particules de B4C et l'affinement de grain de la matrice. Les joints du FSW montraient des propriétés mécaniques supérieures aux joints soudés au laser. On peut obtenir une efficacité du joint jusqu'à 100% par FSW pour les matériaux recuits d'AA1100-16B4C.
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