The Influence of Microstructure on the Tensile Behavior of an Aluminum Metal Matrix Composite PDF Download
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Author: National Aeronautics and Space Adm Nasa
Publisher: Independently Published
ISBN: 9781726810685
Category : Science
Languages : en
Pages : 32
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Book Description
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
Author: National Aeronautics and Space Adm Nasa
Publisher: Independently Published
ISBN: 9781726810685
Category : Science
Languages : en
Pages : 32
Get Book Here
Book Description
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
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 32
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Book Description
Author: Kripa Shanker
Publisher: Springer
ISBN: 9811364125
Category : Technology & Engineering
Languages : en
Pages : 854
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Book Description
This book comprises select proceedings of the International Conference on Future Learning Aspects of Mechanical Engineering (FLAME 2018). The book discusses different topics of industrial and production engineering such as sustainable manufacturing systems, computer-aided engineering, rapid prototyping, manufacturing management and automation, metrology, manufacturing process optimization, casting, welding, machining, and machine tools. The contents of this book will be useful for researchers as well as professionals.
Author: R J Arsenault
Publisher: World Scientific
ISBN: 9814499862
Category : Technology & Engineering
Languages : en
Pages : 482
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Book Description
This is an advanced text on the microstructure and properties of materials, the first volume of a possible 3-volume set. While there are many elementary texts in materials science, there are very few advanced texts. Chapter 1 on aluminum alloys presents microstructural optimization and critical considerations in design applications. Chapter 2 on Nickel-base superalloys reviews the compositional, microstructural and processing advances in increasing their maximum use temperature. Chapter 3 on metal matrix composites discusses the strengthening mechanisms of metals dispersed with short fibers or particles. Chapter 4 on polymer matrix composites contains the details of the microsturcture property relationships of high performance fibers, polymer matrix material and the advanced composites made therewith. Chapter 5 on ceramics matrix composites describes the fibers and matrix materials used, the processing techniques involved and the mechanical properties under different loading conditions. Chapter 6 on inorganic glasses describes the influence of second phases, both glassy and cyrstalline on their properties. Chapter 7 on superconducting materials shows the importance of twins, grain boundaries, dislocations and stacking faults. Chapter 8 on magnetic materials introduces the domain structure and its effects on the soft and hard magnetic properties.
Author: Chinmay Godbole
Publisher:
ISBN:
Category : Magnesium alloys
Languages : en
Pages : 150
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Book Description
The application of Metal Matrix composites (MMC) spans over a wide range of structural applications owing to its improved mechanical properties namely high specific modulus and high strength to weight ratio when compared to their monolithic metal counterparts. Magnesium having a low density of 1.73 gm/cm3 is approximately two thirds of that of aluminum, one fourth of zinc, and one fifth of steel, allows it offer a very high specific strength among conventional engineering alloys. Three Magnesium alloys based nano reinforced metal matrix composite were fabricated using solidification technique followed by hot extrusion. Magnesium alloy AZ31 was reinforced with alumina particulate (Al2O3p) and carbon nanotubes separately to produce (1) AZ31/1.5 vol% Al2O3 and (2) AZ31/1.0 vol% CNT composites. 3 wt% aluminum was added to AZ91 Mg alloy and reinforced with alumina particulate to synthesize (3) AZ (12)1/1.5 vol% Al2O3 nanocomposite. The test specimens of the composites and the monolithic alloys were precision machined and conformed to the standards specified in ASTM E8/E466. The samples were deformed in tension under strain controlled loading at rate of 0.0001s-1 to obtain the tensile properties. Stress amplitude controlled high cycle cyclic fatigue was carried over a range of maximum stress, at frequency of 5 Hz and at load ratios of 0.1 and -1. The number of cycles to failure were recorded. In this thesis report the effect of reinforcement and processing on the microstructure modification, hardness, tensile properties, stress controlled high cycle fatigue response and micro mechanics of final fracture behavior of the magnesium alloy composite is neatly presented discussed and compared with their unreinforced monolithic alloy counterparts. The elastic modulus, yield strength, ultimate tensile strength of the reinforced magnesium alloys were compared to the unreinforced counterpart. The ductility quantified by elongation to failure over 0.5 inches (12.7 mm) gage length of the test specimen and reduction in cross-section area of the composite were compared to the monolithic alloy. A comparison of fatigue response of the reinforced magnesium alloys with unreinforced counterparts were done to observe improvement in cyclic fatigue life at load ratio of 0.1 and -1. The key mechanisms responsible for the superior cyclic fatigue and tensile behavior of the composite are discussed.
Author: Kavian Cooke
Publisher: BoD – Books on Demand
ISBN: 1789845149
Category : Technology & Engineering
Languages : en
Pages : 184
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Book Description
Aluminium (Al) is a metal of great importance because of its excellent corrosion resistance, high electrical and thermal conductivity, good reflectivity, and very good recycling characteristics. The properties of heat-treatable Al-alloys can be further enhanced by the inclusion of a reinforcing phase that increases the mechanical properties of the overall composite. This book is a comprehensive guide on the different types of aluminum alloys and the new advances that have been made in developing and manufacturing aluminum alloys and composites. This text provides a comprehensive overview of the processing, formability, and chemical composition of aluminum alloys and composites. Part One is focused on evaluating the types and properties of advanced aluminum alloys and composites, while Part Two explores characterization. The advantage of this book is that it provides a detailed review of major advances that have occurred in the development and application of aluminum alloys and composites while outlining a development strategy for these materials.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 704
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Book Description
Author: Shojiro Ochiai
Publisher: CRC Press
ISBN: 148229348X
Category : Science
Languages : en
Pages : 823
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Book Description
Provides coverage of dispersion-hardened and fibre-reinforced alloys, addressing principal mechanisms, processing and applications. Mechanical behaviour based on dislocation theory and elastic-plastic mechanics is dealt with and data on advanced composites are provided.
Author: David L. McDanels
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 36
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Book Description
Author: Michael A. Ballou
Publisher:
ISBN:
Category :
Languages : en
Pages : 67
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Book Description
This work includes a comprehensive analysis of the effect of thermomechanical processing (TMP) history on the microstructure and properties of 10 and 20 volume percent 6061 Al-Al2O3 discontinuous metal matrix composites (MMCs). Materials in which cold drawing operations were included in the TMP demonstrated increased ductilities for a given strength level when compared to samples which were processed by hot extrusion only. Microstructural analysis provided clear evidence of the absence of damage to reinforcing particles during TMP and of load transfer to these particles during subsequent straining. Failure during tension testing resulted from the ductile tearing of the matrix as voids initiated by the cracking of reinforcement particles, joined together. A distinct microstructural difference related to processing history was the development of a strongly fibered particle distribution in materials experiencing low temperature drawing operations. In order to conduct an analysis of the mechanisms by which the particles are redistributed and reoriented during processing, a channel compression die was constructed which allowed processing to be simulated by compressive straining on a mechanical testing machine. This allowed careful control of the processing parameters. An analysis of the effects of processing temperature on particle redistribution and reorientation was conducted.
