Lee, KB Ahn, JP Kwon, H 2024-01-21T12:37:11Z 2024-01-21T12:37:11Z 2021-09-01 2001-04 1073-5623 https://pubs.kist.re.kr/handle/201004/140602 Spontaneous infiltration and strengthening behaviors were analyzed in terms of microstructures and tensile properties of AA6061/BN composite fabricated by pressureless infiltration technique in the presence of both Mg and nitrogen. The microstructure and properties were compared with control AA6061 without BN fabricated by the same method. The Mg3N2 formed by the reaction of Mg vapor and nitrogen gas, which coated the particles in the powder bed, is believed to induce spontaneous infiltration through greatly enhancing wetting by means of the reaction Mg3N2 + 2Al -, 2A1N + 3Mg. This was identified by the finding of AIN particle layers on the surfaces of prior Al particles in the powder bed, which made contact with the infiltrating melt. In addition, unreacted Mg3N2 was observed outside the composite, where the Al melt did not come into direct contact. Fine AlN particles formed in situ resulted in significant strengthening, even in the control alloy, with no addition of BN. In the composite reinforced with BN, additional AIN was formed by the interfacial reaction of the BN and Al melt as well as by the in situ reaction. Consequently, both the BN particles and the additional AIN particles formed by the interfacial reaction led to a further strengthening in the composite, as compared to the control alloy, which was strengthened only by the AIN particles formed in situ. In addition, the flake shape of BN may have lent considerable strength, due to the high aspect ratio it demonstrates, as compared with that of a spherically shaped particle. English SPRINGER BORON-NITRIDE MICROSTRUCTURAL DEVELOPMENT INTERFACIAL REACTION MAGNESIUM NITRIDE MATRIX COMPOSITES LIQUID ALUMINUM MOLTEN ALUMINUM WETTABILITY CERAMICS METALS Characteristics of AA6061/BN composite fabricated by pressureless infiltration technique Article 10.1007/s11661-001-0358-5 1 METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, v.32, no.4, pp.1007 - 1018 METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE 32 4 1007 1018 scie scopus 000168011900016 Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Materials Science Metallurgy & Metallurgical Engineering Article BORON-NITRIDE MICROSTRUCTURAL DEVELOPMENT INTERFACIAL REACTION MAGNESIUM NITRIDE MATRIX COMPOSITES LIQUID ALUMINUM MOLTEN ALUMINUM WETTABILITY CERAMICS METALS infiltraiton composite interface reaction convergent beam electron diffraction