Fracture and Crystallographic Phase Correlation in Alumina Based Particulate Composites

Pędzich, Zbigniew; Faryna, Marek

doi:10.4028/www.scientific.net/KEM.290.142

Paper Titles

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Polymer-Derived Al₂O₃-SiC Nanocomposites: Preparation Route vs. Microstructure
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Fracture Toughness Enhancements through Stress Shielding in Functionally Graded SiC-TiC Composites
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Development of Preparation Processes for CNT/Si₃N₄ Composites
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Fracture and Crystallographic Phase Correlation in Alumina Based Particulate Composites
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Quantitative Surface Fractography of Alumina and Alumina-SiC Composites during Diamond Grinding
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Effect of Carbon and Nitrogen Implantation on the Properties of Silicon Nitrides
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HomeKey Engineering MaterialsFractography of Advanced Ceramics IIFracture and Crystallographic Phase Correlation in...

Fracture and Crystallographic Phase Correlation in Alumina Based Particulate Composites

Abstract:

The paper deals with the results of mechanical properties and microstructure investigations performed in two composite systems: Al2O3/WC and Al2O3/W. The fracture toughness measurements were made for materials characteristics. Microstructure of composites was thoroughly investigated using transmission and scanning electron microscopy. Selected Area Electron Dffractions (SAEDs) as well as Electron Backscatter Diffractions (EBSDs) were applied to establish crystallographic relationships between neighboring grains of different phases both in a local and global scale. Examples of orientation maps and stereographic projections for different crystallographic directions as well as orientation relationships between different phases (alumina and reinforcing inclusions) were shown and described.

Info:

Periodical:

Key Engineering Materials (Volume 290)

Main Theme:

Fractography of Advanced Ceramics II

Edited by:

J. Dusza, R. Danzer and R. Morrell

Pages:

142-148

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.290.142

Citation:

Z. Pędzich and M. Faryna, "Fracture and Crystallographic Phase Correlation in Alumina Based Particulate Composites", Key Engineering Materials, Vol. 290, pp. 142-148, 2005

Online since:

July 2005

Authors:

Zbigniew Pędzich, Marek Faryna

Keywords:

Alumina-Based Composites, Electron Backscatter Diffraction (EBSD), Selected Area Diffraction SAED, TEM

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Paper TitlePages

Characteristics of the Deformed and Recrystallised Grains Obtained after Hot Plane Strain Compression of a Model Fe-30wt%Ni Alloy

Authors: F. Bai, P. Cizek, Eric J. Palmiere, W. Mark Rainforth

Abstract: The development of physically-based models of microstructural evolution during hot deformation of metallic materials requires knowledge of the grain/subgrain structure and crystallographic texture characteristics over a range of processing conditions. A Fe-30wt%Ni based alloy, retaining a stable austenitic structure at room temperature, was used for modelling the development of austenite microstructure during hot deformation of conventional carbon-manganese steels. A series of plane strain compression tests was carried out at a temperature of 950 °C and strain rates of 10 s-1 and 0.1 s-1 to several strain levels. Evolution of the grain/subgrain structure and crystallographic texture was characterised in detail using quantitative light microscopy and highresolution electron backscatter diffraction. Crystallographic texture characteristics were determined separately for the observed deformed and recrystallised grains. The subgrain geometry and dimensions together with the misorientation vectors across sub-boundaries were quantified in detail across large sample areas and the orientation dependence of these characteristics was determined. Formation mechanisms of the recrystallised grains were established in relation to the deformation microstructure.

Microstructural Features of Cu-Zn Single Crystals Deformed at Elevated Temperature

Authors: Barbara Grzegorczyk, Wojciech Ozgowicz, Elżbieta Kalinowska-Ozgowicz, Aleksander Kowalski

Abstract: Copper alloys are characterized by high plasticity and good resistance to corrosion. They are applied in electrical industry, telecommunication, in transport and machine building, particularly in the production of elements for deep drawing. The scope of investigation enclosed production of testing single crystals, determination of their crystallographic orientation, deformation of selected single crystals by compression in a temperature range from 20 °C to 400 °C, applying strain rate from 10^-5s^-1 to 10^-1s^-1 as well as microstructure observations. Typical plastic strain effects were observed in the microstructures of studied single crystals in the form of parallel and intersecting lines and slip bands with locally intensified density in different areas of cross section of examined specimen and the deflection bands with slightly marked slip lines in the primary system.

Anisotropic Mechanical Properties of Pure Magnesium Analyzed by In Situ Nanoindentation

Authors: Jiří Bočan, Jan Maňák, Aleš Jäger

Abstract: In this work, correlation between nanomechanical properties and crystallographic orientation of grains in 99.9 % magnesium is presented. Crystallographic orientation of individual grains was obtained by scanning electron microscope (SEM) equipped with electron backscatter diffraction (EBSD) detector. Hardness and elastic modulus of grains with known orientation were subsequently determined by in situ nanoindentation in SEM. We show that hardness decreases with increasing angle between the direction of indentation and the c-axis of grains, while elastic modulus varies non-monotonically.