Microstructure and Orientation Effects on Properties of Discontinuous Silicon Carbide/aluminum Composites PDF Download

Author: David L. McDanels
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 36

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Author: P. Balladon
Publisher:
ISBN:
Category : Mechanical properties
Languages : en
Pages : 13

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Three grades of silicon carbide (SiC) reinforced aluminium alloys are studied: one grade fabricated by powder metallurgy and reinforced by ?25% volume fraction (vf) SiC particulates; two grades produced by casting and reinforced by ?15% vf SiC whiskers.

Author: Franklin Edward Wawner
Publisher:
ISBN:
Category :
Languages : en
Pages : 110

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This program deals with determining factors that influence strength, ductility, fracture toughness, and elongation to failure in Silicon Carbon Whisker/Aluminum alloy composites. Specifically, a microstructural study is being made in an attempt to define extrinsic and intrinsic factors that control fracture and thus influence properties. One of the more important products produced by ACMC from SiCw/Al composites has been the rolled sheet. The response of the material to secondary processing and thermo-mechanical treatment is of utmost importance with respect to material quality. The present study emphasizes microstructural-mechanical property characterization of the rolled material (JES).

Author: Chikara Fujiwara
Publisher:
ISBN:
Category :
Languages : en
Pages : 67

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SiC particulate reinforced A1-2%Mg composites were produced at volume fractions 0.1, 0.2, and 0.3 by inert atmosphere ball milling followed by Hot Isostatic Pressing consolidation and extrusion. The SiC particulate sizes evaluated were 5 microns, 1 micron, and 0.2 microns. The processing sequences were carefully controlled to minimize oxygen contamination. The resulting microstructures of the as-extruded materials showed a very uniform distribution of particulates within the matrix. Ultimate strength, 0.2% yield strength, and modulus of elasticity increased with decreasing SiC particulate size: 1 micron SiC-A1 matrix showed the highest elongation. Fractures originated at inclusions rich in iron, chromium, and nickel. These contaminants seemed to come from the mill chamber and/or the hardened steel balls during ball milling. Keywords: Silicon carbide, Composites, Ball milling, Microstructure.

Author: Sylvie Dionne
Publisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages : 13

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Author: Sven Alagic
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Aluminum is widely used in aerospace structural components because of its low cost, light weight, and high strength properties. Aluminum silicon carbide composites are an opportunity to reduce weight of these structural components without sacrificing strength. Aluminum and silicon carbide have similar densities (2.6 and 3.21 g/cm3 respectively), but silicon carbide has much higher hardness and strength. In this thesis, improved hardness, elastic modulus, yield strength, and ultimate tensile strength were achieved in an aluminum alloy based composite system by the addition of silicon carbide particles. Bulk baseline samples as well as samples containing various amounts of SiC were manufactured using Field Assisted Sintering Technology (FAST). Hardness was found to improve from 130 HV in ECKA Al-Alloy to 207 HV in Al Alloy with 40% SiC composite (60% improvement). This improvement was accompanied with an improvement in elastic modulus from 81 GPa in ECKA Aluminum Alloy to 126 GPa in Aluminum Alloy with 40% SiC (40% improvement). Yield strength improved from 211 to 417 MPa (97% improvement) and ultimate tensile strength improved from 308 to 472 MPa (50% improvement) for these materials.The microstructure of the samples revealed a homogeneous dispersion of silicon carbide particles throughout the aluminum matrix. The improvement in specific strength was 50% over the baseline aluminum alloy. The samples have been used as extrusion feedstock as a proof of concept for eventual structural applications.

Author: Subra Suresh
Publisher: Elsevier
ISBN: 0080523714
Category : Technology & Engineering
Languages : en
Pages : 353

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`Metal-Matrix Composites' are being used or considered for use in a variety of applications in the automotive, aerospace and sporting goods industries. This book contains sixteen chapters, all written by leading experts in the filed, which focus on the processing, microstructure and characterization, mechanics and micromechanics of deformation, mechanics and micromechanics of damage and fracture, and practical applications of a wide variety of metal composites.A particularly noteworthy feature of this authoritative volume is its collection of state-of-the-art reviews of the relationships among processing, microstructural evolution, micromechanics of deformation and overall mechanical response.

Author: Andrew J. Ruys
Publisher: Woodhead Publishing
ISBN: 0081024436
Category : Technology & Engineering
Languages : en
Pages : 582

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Alumina Ceramics: Biomedical and Clinical Applications examines the extraordinary material, Alumina, and its use in biomedicine and industry. Sections discuss the fundamentals of Alumina Ceramics, look at the various industrial applications, and examine a variety of medical applications. Readers will find this to be an invaluable and unique resource for researchers, clinical professionals, engineers, and advanced level students. Alumina ceramics are a leading biomaterial used for specialist medical applications, such as bionic implants and tissue engineering, and the only biomaterial commercially viable for use as bearings for orthopedic hip replacements. As such, this book is a timely resource on the topics discussed. - Provides a unique and thorough review of Alumina ceramics - Written by one of the world's leading experts in bioceramics and advanced industrial ceramics, especially alumina - Targeted to researchers in the materials, clinical and dental fields - Enables the non-expert with an overview of the underlying alumina technology, major challenges, major successes and future directions

Author: Howard Kuhn
Publisher: Elsevier
ISBN: 0323159842
Category : Technology & Engineering
Languages : en
Pages : 223

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Powder Metallurgy Processing: New Techniques and Analyses covers the application of advanced analytical techniques in metallurgy, mechanics, and economics to the fundamentals of powder fabrication processes. The book discusses powder production by gas and water atomization of liquid metals; the triaxial stress state compaction of powders; and the diffusional homogenization of compacted blends of powders. The text also describes the deformation processing of sintered powder materials; the analysis of mechanical property-structure relations in powder forgings; and the economic risk analysis of a miniplant for production of steel strip from powder. Chemical engineers and metallurgists and students taking related courses will find the book invaluable.

Author: Niels Hansen
Publisher: Ris National Laboratory
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 790

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