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Role of particle stimulated nucleation in recrystallization of hot extruded Al 6061/SiC_p composites

Transactions of Nonferrous Metals Society of China 2013年第1期23卷 53-58页

作者： C.S.RAMESH R.KESHAVAMURTHY praveennath g.koppad K.T.KASHYAP Department of Mechanical Engineering PES Institute of TechnologyBangalore 560085India Visiting Professor School of DesignEngineering and ComputingBournemouth UniversityUnited Kingdom Central Manufacturing Technology Institute Tumkur RoadBangalore 560022India

Studies on texture and microstructure evolution in hot extruded Al 6061 aluminium alloy reinforced with uncoated and nickel coated SiC p were carried out by electron backscattered diffraction *** of both the alloy and its composite with nickel coated SiC p do exhibit strong β fiber with its axis parallel to the direction of *** addition to the dominant cube texture（001） 100,fully recrystallized grains with partially equiaxed structure have been observed in the alloy reinforced with uncoated SiC *** recrystallization texture of this composite can be attributed to the particle stimulated nucleation（PSN） due to the presence of SiC p with size less than 5 μ*** these conditions,the low value of Zener-Hollomon,Z（～1012s-1） confirms that PSN is one of the dominant mechanisms for recrystallization and is governed by formation of deformation zone rather than stored energy.

关键词： metal matrix composites 6061/SiC p composite extrusion particle stimulated nucleation recrystallization stored energy

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Mechanical and thermal properties of AA7075/TiO2/Fly ash hybrid composites obtained by hot forging

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Progress in Natural Science:Materials International 2017年第4期27卷 474-481页

作者： K.V.Shivananda Murthy D.P.girish R.Keshavamurthy Temel Varol praveennath g.koppad Department of Mechanical Engineering Government Engineering Colleg 2. Department of Mechanical Engineering Dayananda Sagar College of Engineering 3. Department of Metallurgical and Materials Engineering Karadeniz Technical University 4. Department of Mechanical Engineering CMR Institute of Technology

In the present paper, multiple reinforcements TiO2 and fly ash were utilized for the fabrication of AA7075 matrix based hybrid composites using stir casting technique followed by hot forging. In hybrid composites, the fly ash content was fixed to 3 wt% while that of TiO2 was varied from 2.5 to 10 wt%. Scanning electron microscopy images revealed homogenous dispersion of both the reinforcements in AA7075 *** test was conducted to study the mechanical behaviour of hybrid composites. The hybrid composites showed increase in compressive strength with the incorporation of multiple reinforcements and further increased with the increase in the weight fractions of TiO2 particles. The coefficient of thermal expansion was measured between 50 and 250 ℃ with a high precision thermal mechanical analyser. The thermal coefficient of hybrid composites decreased with the addition of TiO2 and fly ash. However a slight decrease in thermal conductivity of hybrid composites was observed when compared to that of AA7075 alloy.

关键词： Hybrid composites Hot forging Mechanical properties Thermal properties

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