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In situ fabrication and properties of Al N dispersion strengthened 2024 aluminum alloy

International Journal of Minerals,Metallurgy and Materials 2014年第12期21卷 1228-1232页

作者： Wei-wei Yang Zhi-meng Guo Lei-chen Guo Hui-qin Cao Ji Luo An-ping Ye Institute of Advanced Materials and Technology University of Science and Technology Beijing School of Engineering Rensselaer Polytechnic Institute

Nanoscaled aluminum nitride （AlN） dispersion strengthened 2024 aluminum alloy was fabricated using a novel approach in which Al-Mg-Cu compacts were partially nitrided in flowing nitrogen gas. The compacts were subsequently consolidated by sintering and hot extrusion. The microstructure and mechanical properties of the material were preliminarily investigated. Transmission electron microscopy and X-ray diffraction results revealed that AlN particles were generated by the nitridation of Al-Mg-Cu compacts. The material exhibited excellent mechanical properties after hot extrusion and heat treatment. The ultimate tensile and yield strengths of the extruded samples containing 8.92vol% AlN with the T6 heat treatment were 675 and 573 MPa, respectively.

关键词： dispersion strengthened alloys aluminum alloys aluminum nitride fabrication mechanical properties

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Stress-rupture measurements of cast magnesium strengthened by in-situ production of ceramic particles

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Journal of Magnesium and alloys 2017年第2期5卷 225-230页

作者： Nagaraj M.Chelliah Sudarshan Lisa Kraemer Harpreet Singh M.K.Surappa Rishi Raj Department of Mechanical Engineering University of Colorado BoulderBoulderCO 80302USA Department of Mechanical Engineering Indian Institute of TechnologyRopar 140001India Erich Schmid Institute of Material Science Austrian Academy of SciencesLeobenA-8700Austria Department of Materials Engineering Indian Institute of ScienceBangalore 560012India

We have introduced a polymer precursor into molten magnesium and then in-situ pyrolyzed to produce castings of metal matrix composites(P-MMCs)containing silicon-carbonitride(SiCNO)ceramic ***-rupture measurements of as-cast P-MMCs was performed at 350 ℃(0.69TM)to 450 ℃(0.78TM)under dead load condition corresponding to tensile stress of 2.5 MPa to 20 *** time-to-fracture data were analyzed using the classical Monkman–Grant *** time-to-fracture is thermally activated and follows a power-law stress exponent exhibiting dislocation *** analysis revealed that while pure magnesium appears to fracture by dislocation slip,the P-MMCs fail from the nucleation and growth of voids at the grain boundaries.

关键词： Stress-rupture Polymer derived ceramics Magnesium dispersion strengthened alloys High temperature Light-weight materials

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