Download or read book Process dependent Microstructure and Severe Plastic Deformation in SiCp Reinforced Aluminum Metal Matrix Composites written by Catalina Uribe-Restrepo and published by . This book was released on 2011 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: Discontinuously reinforced MMCs with optimized microstructure are sought after for exceptional high strain rate behavior. The microstructure evolution of a stir-cast A359 aluminum composite reinforced with 30 vol.% SiC[subscript p] after isothermal anneal, successive hot-rolling, and high strain rate deformation has been investigated. Quantitative microstructural analysis was carried out for the as-cast, annealed (470°C, 538°C and 570°C) and successively hot rolled specimens (64, 75, 88, and 96% rolling reductions). Selected composites were also examined after high strain rate deformation. X-ray diffraction, optical microscopy, scanning electron microscopy and transmission electron microscopy were employed for microstructural characterization. The strength and ductility of the A359 Al alloys, and the composite, were greatly influenced by the brittle eutectic silicon phase and its morphology. Lamellar eutectic silicon spheroidized with isothermal anneal and successive hot rolling with a corresponding decrease in hardness. The hot rolling process also considerably decreased the SiC particle size (approximately 20% after 96% reduction) by breaking-up the hard SiC particles. However, this break-up of particles increased the homogeneity of SiC[subscript p] size distribution. Successive hot rolling also healed voids due to solidification shrinkage, incomplete infiltration of molten Al and defects originating from fractured particles. Four selected specimens of composites were examined after high strain rate deformation. Fractography and metallographic analysis for the craters, voids, and relevant regions affected by the high velocity impact were carried out. The deposition of impact residuals was frequently observed on the exposed fracture surfaces. These residuals were typically observed as "molten-and-solidified" as a consequence of excessive heat generated during and after the damage. Particularly in regions of entry and exit of impact, intermixing of residuals and composite constituents were observed, demonstrating that the Al matrix of the composite also had melted. In all samples examined, cracks were observed to propagate through the eutectic Si network while a small number of broken reinforcement particles were observed. A slight variation in failure mechanisms was observed (e.g., radial, fragmentation, petalling) corresponding to the variation in ductility against high strain rate deformation. In selected specimens, parallel sub-cracks at the exit were observed at 45° and 30°. These sub-cracks were again filled with intermixed constituents from projectile residuals and composites. This observation suggests that the melting of composite constituents that leads to intermixing occured after the crack propagation and other damage.

Download or read book Processing of Metal Matrix Composites Through Severe Plastic Deformation written by and published by . This book was released on 2003 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the Final Progress Report for an ARO research program extending over a period of 3 years. The program was designed to evaluate the processing of materials using the procedure of Equal-Channel Angular Pressing (ECAP) in which a coarse-grained bulk solid is subjected to severe, but controlled, plastic deformation. Two metal matrix composites were investigated in detail: an aluminum 2009 alloy reinforced with 25% SiC particulates and an aluminum 6061 alloy reinforced with 10% alumina particulates. The results demonstrate the potential for achieving high strength and excellent mechanical properties in these two composites. Additional collaborations were established with other leading groups in the field and this led to many new insights in the field of ECAP processing. All of these new developments are described in detail in the publications arising from this program.

Download or read book Handbook of Mechanical Nanostructuring written by Mahmood Aliofkhazraei and published by John Wiley & Sons. This book was released on 2016-05-02 with total page 816 pages. Available in PDF, EPUB and Kindle. Book excerpt: Providing in-depth information on how to obtain high-performance materials by controlling their nanostructures, this ready reference covers both the bottom-up and the top-down approaches to the synthesis and processing of nanostructured materials. The focus is on advanced methods of mechanical nanostructuring such as severe plastic deformation, including high pressure torsion, equal channel angular processing, cyclic extrusion compression, accumulative roll bonding, and surface mechanical attrition treatment. As such, the contents are inherently application-oriented, with the methods presented able to be easily integrated into existing production processes. In addition, the structure-property relationships and ways of influencing the nanostructure in order to exhibit a desired functionality are reviewed in detail. The whole is rounded off by a look at future directions, followed by an overview of applications in various fields of structural and mechanical engineering. With its solutions for successful processing of complex-shaped workpieces and large-scale specimens with desired properties, this is an indispensable tool for purposeful materials design.

Download or read book Microstructure and Aging Response of SiCp Reinforced A356 Al Metal Matrix Composite Subject to Post Fabrication Thermomechanical Processing written by Donald Vincent Avenger and published by . This book was released on 1994 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The microstructure and aging behavior of a centrifugally cast A356 Al-SiCp metal matrix composite was studied as a function of post-fabrication processing via transmission electron microscopy (TEM) and differential scanning caloritemetry (DSO). The effects of total rolling strain, strain per rolling pass and rolling temperature on both microstructure and precipitation behavior were investigated. It was found that post fabrication processing had relatively little effect on the kinetics of the various precipitation processes that constitute aging, although they affected the amounts of the various precipitates significantly.

Download or read book An Investigation of the Effects of Processing on the Fracture Properties of a Sicp 6XXX Al Composite written by Frank N. Quiles and published by . This book was released on 1996-06-01 with total page 95 pages. Available in PDF, EPUB and Kindle. Book excerpt: Discontinuous reinforced aluminum (DRA) composites are attractive as structural materials because of their desirable stiffness and strength to weight ratios and relative ease of manufacture. However, they typically display low tensile ductility and fracture toughness. In this work, the impact of post- fabrication deformation processing and heat treatment on the fracture properties of a 17.5 vol. % SiCsubp reinforced Al 6092 matrix composite is investigated. Process temperature, total strain and strain rate during extrusion were varied in order to explore the feasibility of obtaining Particle Stimulated Nucleation (PSN) of recrystallization during processing, with the goal of refining the matrix grain size. Additionally, various combinations of solution and aging treatments were investigated with the aim of obtaining a number of stable matrix microstructural conditions with varying levels of composite strength and fracture toughness. A preliminary investigation of fracture mechanisms and their dependence on the matrix aging state has also been carried out using optical and scanning electron microscopy (SEM) and differential scanning calorimetry (DSC), and is reported here.

Download or read book Microstructure and Aging Response of SiCp Reinforced A356 Al Metal Matrix Composite Subject to Post Fabrication Thermomechanical Processing written by Donald Vincent Avenger and published by . This book was released on 1994 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt: The microstructure and aging behavior of a centrifugally cast A356 Al-SiCp metal matrix composite was studied as a function of post-fabrication processing via transmission electron microscopy (TEM) and differential scanning caloritemetry (DSO). The effects of total rolling strain, strain per rolling pass and rolling temperature on both microstructure and precipitation behavior were investigated. It was found that post fabrication processing had relatively little effect on the kinetics of the various precipitation processes that constitute aging, although they affected the amounts of the various precipitates significantly.

Download or read book Effect of Rolling on the Redistribution of SiCp Clusters and Its Influence on the Mechanical Properties of 10 SiCp 6061 A1 Composites written by Jae-Chul Lee and published by . This book was released on 1989 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Microstructure property Relationships in SiCp reinforced Aluminum Composites written by Sylvie Dionne and published by . This book was released on 1991 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Investigation of the Effects of Secondary Processing on the Fracture Properties of a SiCp 6XXX Al Composite written by Frank N. Quiles and published by . This book was released on 1996 with total page 85 pages. Available in PDF, EPUB and Kindle. Book excerpt: Discontinuous reinforced aluminum (DRA) composites are attractive as structural materials because of their desirable stiffness and strength to weight ratios and relative ease of manufacture. However, they typically display low tensile ductility and fracture toughness. In this work, the impact of post- fabrication deformation processing and heat treatment on the fracture properties of a 17.5 vol. % SiCsubp reinforced Al 6092 matrix composite is investigated. Process temperature, total strain and strain rate during extrusion were varied in order to explore the feasibility of obtaining Particle Stimulated Nucleation (PSN) of recrystallization during processing, with the goal of refining the matrix grain size. Additionally, various combinations of solution and aging treatments were investigated with the aim of obtaining a number of stable matrix microstructural conditions with varying levels of composite strength and fracture toughness. A preliminary investigation of fracture mechanisms and their dependence on the matrix aging state has also been carried out using optical and scanning electron microscopy (SEM) and differential scanning calorimetry (DSC), and is reported here.

Download or read book Some Aspects of Performance Appraisal of Aluminum Silicon Carbide Particulate SiCp Metal Matrix Composite written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Stresses induced due to thermal mismatch between the metal matrix and the ceramic reinforcement in metal matrix composite may impart plastic deformation to the matrix there by resulting in a reduction of the residual stresses. Thermal mismatch strains also may quite often crack the matrix resulting in a relaxation of the residual stresses. The interface in MMCs is a porous, non-crystalline portion in comparison with the matrix or the reinforcement (metal matrix and ceramic reinforcement in this case). Therefore residual stresses are readily released at the porous and non-crystalline interface as a result of which when particle density is high, i.e. in regions which are particle starved, meaning the availability of the interface is limited, particle fracturing is predominating. In the present investigation ring-shaped Al-SiCp MMCs are fabricated in the solid state processing route. The sintering temperature and time of holding at the sintering temperature are varied and the s ...

Download or read book Modern Manufacturing Engineering written by J. Paulo Davim and published by Springer. This book was released on 2015-06-19 with total page 323 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers recent research and trends in Manufacturing Engineering. The chapters emphasize different aspects of the transformation from materials to products. It provides the reader with fundamental materials treatments and the integration of processes. Concepts such as green and lean manufacturing are also covered in this book.

Download or read book Ultrafine Grained Metals written by Heinz Werner Höppel and published by MDPI. This book was released on 2018-07-02 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a printed edition of the Special Issue "Ultrafine-grained Metals" that was published in Metals

Download or read book Processing Microstructure and Mechanical Properties of Aluminum Based Metal Matrix Composites written by Liping Ren and published by . This book was released on 1998 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Silicon Carbide Particulate Reinforced Aluminum Alloys Matrix Composites Fabricated by Squeeze Casting Method written by Adem Onat and published by . This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metal Matrix Composites (MMCs) are now attracting enormous interest, because of their superiority in strength, stiffness, wear resistance, elevated temperature strength or other engineering properties. Parallel to commercialisation, there are research centres throughout the world that are actively researching further development and exploitation of net or near net shape fabrication process. In this book, the production and characterisation of SiC particles reinforced Al alloy matrix composites produced by squeeze casting are investigated. The effects of volume fraction of SiC on microstructure, mechanical properties are examined as well. Also the results of the production of gravity cast matrix alloy, to determine the effect of pressure on microstructure and properties are described in this book.

Download or read book Microdeformation Behaviour of Al SiCp Composites written by Dimitrios Myriounis and published by LAP Lambert Academic Publishing. This book was released on 2013 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metal Matrix ceramic-reinforced composites are rapidly becoming strong candidates as structural materials for many high temperatures and aerospace applications. Metal matrix composites combine the ductile properties of the matrix with a brittle phase of the reinforcement, leading to high stiffness and strength with a reduction in structural weight. The satisfactory performance of metal matrix composites depends critically on their integrity, the heart of which is the quality of the matrix-reinforcement interface. The nature of the interface depends on the processing of the metal matrix composite component. The Al/SiCp composites studied, processed in specific thermo-mechanical conditions in order to attain higher values of interfacial fracture strength, due to precipitation hardening and segregation mechanisms, also exhibited enhanced bulk mechanical and fracture resistant properties. An analytical model to predict the interfacial fracture strength in the presence of material segregation was also developed during this research effort.

Download or read book Modeling of Heterogeneous Plastic Deformation in Metals and Metal Matrix Composites written by Hong-tao Zhu and published by . This book was released on 1995 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Metals Abstracts written by and published by . This book was released on 1998 with total page 1076 pages. Available in PDF, EPUB and Kindle. Book excerpt: