Download or read book Microstructural Damage and Mechanical Properties of a Metal Matrix Composite Al particulate SiC and an Intermetallic titanium Aluminide Under Various Deformation Regimes written by Peter Christopher Gardiner and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Index to Theses with Abstracts Accepted for Higher Degrees by the Universities of Great Britain and Ireland and the Council for National Academic Awards written by and published by . This book was released on 2000 with total page 868 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1992 with total page 1572 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:
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 974 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2676 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book British National Bibliography for Report Literature written by and published by . This book was released on 2000 with total page 784 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Microstructure strength Relationship of a Deformation Processed Aluminum titanium Composite written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The mechanical properties, electrical properties and microstructures have been evaluated for an Al-20 wt% Ti deformation processed metal metal matrix composite (DMMC). The strength of the swaged, extruded and wire drawn composite increases several-fold with increasing deformation up to a true strain of 12.1, the maximum investigated. At this point the Ti was elongated and SEM and TEM analysis of the transverse direction of the wire showed the ribbon-like filaments that are common for this type of material. Texture development was also characterized to explain the deformation characteristics of the composite materials. The Ti filaments acquired a10[bar 1]0 fiber texture during deformation, and the Al filaments acquired a dual texture of (111) and (100). Resistivity measurements of the composite showed that for the highest deformed sample ([eta]= 12.1), the resistivity increased linearly with temperature up to the temperature where Al[sub 3]Ti formed. At this point the slope increased. Beyond this point, the resistivity of the sample never returned to its original value. The temperature where Al[sub 3]Ti forms was investigated using DTA and XRD analysis. The reaction temperature decreases with increasing deformation true strain ([eta]) and filament spacing.
Download or read book The Influence of Microstructure on the Tensile Behavior of an Aluminum Metal Matrix Composite written by and published by . This book was released on 1990 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigation of microstructural factors that cause low fracture toughness in silicon carbide whisker al alloy composites written by F. E. Wawner and published by . This book was released on 1987 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: The problem of low fracture toughness and low elongation to failure in silicon carbide whisker/aluminum alloy matrix composites is controlled by matrix composition and microstructure. Large, brittle, constituent particles as well as other precipitate phases along whisker interfaces strongly influence these properties. The purpose of this study is to define the fracture characteristics of the material from an atomic standpoint; to define the factors that influence fracture toughness and elongation; to propose a model for the failure mechanism and steps that can be taken to enhance the properties; and to evaluate materials produced by using these concepts. Work during the first year of this program has emphasized microstructural and mechanical property evaluation of systems with altered chemistry of the alloy matrix and thermomechanical treatments of standard alloy systems.
Download or read book The Influence of Microstructure on the Tensile Behavior of an Aluminum Metal Matrix Composite written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-10-06 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: The relationship between tensile properties and microstructure of a powder metallurgy aluminum alloy, 2009 was examined. The alloy was investigated both unreinforced and reinforced with 15 v/o SiC whiskers or 15 v/o SiC particulate to form a discontinuous metal matrix composite (MMC). The materials were investigated in the as-fabricated condition and in three different hot-rolled sheet thicknesses of 6.35, 3.18, and 1.8 mm. Image analysis was used to characterize the morphology of the reinforcements and their distributions within the matrix alloy. Fractographic examinations revealed that failure was associated with the presence of microstructural inhomogeneities which were related to both the matrix alloy and to the reinforcement. The results from these observations together with the matrix tensile data were used to predict the strengths and moduli of the MMC's using relatively simple models. The whisker MMC could be modeled as a short fiber composite and an attempt was made to model the particulate MMC as a dispersion/dislocation hardened alloy. Birt, Michael J. and Johnson, W. Steven Langley Research Center RTOP 506-43-71-03
Download or read book Mechanical and Physical Properties of Particulate Composites in the System Titanium Nitride alumina aluminum Nitride written by K. J. Liles and published by . This book was released on 1989 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Deformation and Forging Limits for a Particulate reinforced Aluminum Matrix Composite written by Dzu-gwang Charles Syu and published by . This book was released on 1992 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Recrystallization and Related Annealing Phenomena written by F.J. Humphreys and published by Elsevier. This book was released on 2012-12-02 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt: The annealing of deformed materials is of both technological importance and scientific interest. The phenomena have been most widely studied in metals, although they occur in all crystalline materials such as the natural deformation of rocks and the processing of technical ceramics. Research is mainly driven by the requirements of industry, and where appropriate, the book discusses the extent to which we are able to formulate quantitative, physically-based models which can be applied to metal-forming processes.The subjects treated in this book are all active research areas, and form a major part of at least four regular international conference series. However, there have only been two monographs published in recent times on the subject of recrystallization, the latest nearly 20 years ago. Since that time, considerable advances have been made, both in our understanding of the subject and in the techniques available to the researcher.The book covers recovery, recrystallization and grain growth in depth including specific chapters on ordered materials, two-phase alloys, annealing textures and annealing during and after hot working. Also contained are treatments of the deformed state and the structure and mobility of grain boundaries, technologically important examples and a chapter on computer simulation and modelling. The book provides a scientific treatment of the subject for researchers or students in Materials Science, Metallurgy and related disciplines, who require a more detailed coverage than is found in textbooks on physical metallurgy, and a more coherent treatment than will be found in the many conference proceedings and review articles.
Download or read book Titanium Matrix Composites written by Shankar Mall and published by CRC Press. This book was released on 2020-01-29 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt: A review and summary of advancements related to mechanical behavior and related mechanics issues of titanium matrix composites (TMCs), a class of high-temperature materials useful in the propulsion and airframe components in advanced aerospace systems. After an introduction to TMCs, different authors review and summarise the advancements related to mechanical behavior and related mechanics issues of TMCs.
Download or read book Mechanical Properties of Spray Atomized SiC Particle Reinforced Aluminum Titanium Alloys written by and published by . This book was released on 1990 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the present study, the elevated temperature mechanical behavior and microstructure of Al-Ti-Silicon carbide particulates SiCp metal matrix composites (MMCs) processed by spray atomization and co deposition were investigated. The elevated temperature mechanical properties of the spray deposited and hot extruded materials were studied following a 100 hour exposure at 250, 350, 450 C; the mechanical properties at room temperature were also determined. The results of the present study show that the elevated temperature yield strength of the spray deposited and extruded materials compared favorably to those of an equivalent alloy made by powder metallurgical materials, were superior to those of the ingot material, but were inferior to those of mechanically alloyed Al-Ti materials. The evolution of the microstructure as a result of the thermal annealing was investigated using X-ray diffraction, TEM, and optical microscopy. The results from X-ray diffractometry studies showed extensive precipitation of the equilibrium Al3Ti phase during thermal exposure. In addition, no interfacial reactions were observed.
