Processing, Microstructure and High Temperature Deformation Behavior of Particulate Composites Made from Niobium and Alumina PDF Download
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Author: Yan Wang
Publisher:
ISBN:
Category :
Languages : en
Pages : 220
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Book Description
Author: Yan Wang
Publisher:
ISBN:
Category :
Languages : en
Pages : 220
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Book Description
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 702
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 42
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Book Description
The ability to integrate ceramics with other materials has been limited due to high temperature (>800degC) ceramic processing. Recently, researchers demonstrated a novel process, aerosol deposition (AD), to fabricate ceramic films at room temperature (RT). In this process, sub - micro n sized ceramic particles are accelerated by pressurized gas, impacted on the substrate, plastically deformed, and form a dense film under vacuum. This AD process eliminates high temperature processing thereby enabling new coatings and device integration, in which ceramics can be deposited on metals, plastics, and glass. However, k nowledge in fundamental mechanisms for ceramic particle s to deform and form a dense ceramic film is still needed and is essential in advancing this novel RT technology. In this wo rk, a combination of experimentation and atomistic simulation was used to determine the deformation behavior of sub - micron sized ceramic particle s ; this is the first fundamental step needed to explain coating formation in the AD process . High purity, singl e crystal, alpha alumina particles with nominal size s of 0.3 um and 3.0 um were examined. Particle characterization, using transmission electron microscopy (TEM), showed that the 0.3 u m particles were relatively defect - free single crystals whereas 3.0 u m p articles were highly defective single crystals or particles contained low angle grain boundaries. Sub - micron sized Al 2 O 3 particles exhibited ductile failure in compression. In situ compression experiments showed 0.3um particles deformed plastically, fractured, and became polycrystalline. Moreover, dislocation activit y was observed within the se particles during compression . These sub - micron sized Al 2 O 3 particles exhibited large accum ulated strain (2 - 3 times those of micron - sized particles) before first fracture. I n agreement with the findings from experimentation, a tomistic simulation s of nano - Al 2 O 3 particles showed dislocation slip and significant plastic deformation during compressi on . On the other hand, the micron sized Al 2 O 3 particles exhibited brittle f racture in compression. In situ compression experiments showed 3um Al 2 O 3 particles fractured into pieces without observable plastic deformation in compression. Particle deformation behaviors will be used to inform Al 2 O 3 coating deposition parameters and particle - particle bonding in the consolidated Al 2 O 3 coatings.
Author: Kenong Xia
Publisher:
ISBN:
Category :
Languages : en
Pages : 426
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Author:
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Category : Aeronautics
Languages : en
Pages : 980
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Author: Paul Charles Brennan
Publisher:
ISBN:
Category :
Languages : en
Pages : 302
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Author: T. S. Srivatsan
Publisher: Springer
ISBN: 3319728539
Category : Technology & Engineering
Languages : en
Pages : 253
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Book Description
This book includes papers on recent research carried out in the field of metal-matrix composites (MMCs). Processing, microstructure, and mechanical properties of MMCs and unreinforced matrix alloys will be covered with a focus on aluminum, titanium, nickel, and copper MMCs. Those involved in the research of MMCs and unreinforced alloys, particularly in aerospace, space, and automotive materials research, will find this volume indispensible.
Author:
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ISBN:
Category : Composite materials
Languages : en
Pages : 790
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Category : Metallurgy
Languages : en
Pages : 972
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 410
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This document contains the following topics: (1) A fiber fracture model for metal matrix composite monotape consolidation; (2) Effects of composite processing on the strength of sapphire fiber-reinforced composites; (3) On the flexural properties of brittle multilayer materials; (4) The microstructure of SiC/C composites and relationships with mechanical properties; (5) Microstructural observations on constrained densification of alumina powder containing a periodic array of sapphire fibers; (6) Material issues in layered forming; (7) Thermal modelling and experimental testing of Md spray shape deposition processes; (8) Liquid precursor infiltration and pyrolysis of powder compacts; (9) Influence of interparticle force on the rheological behavior of pressure-consolidated alumina particle slurries; (10) Evolution of a metastable FCC solid solution during sputter deposition of Ti-Al-B alloys; (11) Novel ODS copper alloys from rapidly-solidified precursors; (12) Mechanical properties of partially dense alumina produced from powder compacts.
