Search results for: intermetallic-matrix-composites

Intermetallic Matrix Composites

Author : Rahul Mitra
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Intermetallic Matrix Composites: Properties and Applications is a comprehensive guide that studies the types and properties of intermetallic matrix composites, including their processing techniques, characterization and the various testing methods associated with these composites. In addition, it presents modeling techniques, their strengthening mechanisms and the important area of failure and repair. Advanced /complex IMCs are then explained, such as Self-healing IMCs and laminated intermetallic composites. The book concludes by delving into the industries that use these materials, including the automotive industry. Reviews the latest research in intermetallic matrix composites Contains a focus on properties and applications Includes contributions from leading experts in the field

Structural Intermetallics and Intermetallic Matrix Composites

Author : Rahul Mitra
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Fills a Prominent Gap in a Significant Area of Intermetallics Presenting a comprehensive overview of structural intermetallics (the most important class of intermetallics), Structural Intermetallics and Intermetallic Matrix Composites is a reference written with the beginning student as well as the practicing professional in mind. Utilizing the author’s more than two decades of experience working on silicides and teaching a course on advanced materials, this text addresses the fundamental aspects related to structure, mechanical behavior, and the oxidation resistance of selected intermetallics and their composites. In addition to covering the structure and properties of selected intermetallics, the text places special emphasis on composite intermetallics and specifically focuses on select aluminides and silicides. It reviews existing literature on select structural silicides and aluminides, considers possible applications on the basis of the attractive properties of aluminides and silicides, and also factors in future directions of research. Fundamental aspects include thermodynamic principles, phase diagrams and crystal structures, processing methods, deformation and fracture mechanisms of ordered intermetallics, and oxidation behavior with mechanisms for protection against environmental degradation. Comprising nine chapters, this text: Explores the state-of-the-art accomplishments in this area Considers further research related to the topic Examines further innovations applying these materials An up-to-date introduction to structural intermetallics, Structural Intermetallics and Intermetallic Matrix Composites helps readers grasp the complexities of the structure of intermetallics and their effect on various physical and mechanical properties. It also highlights the recent state of development in the field.

Intermetallic Matrix Composites II Volume 273

Author : D. B. Miracle
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The MRS Symposium Proceeding series is an internationally recognised reference suitable for researchers and practitioners.

The Processing of Intermetallic Matrix Composites

Author : D. G. W. Palmer
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Intermetallic Matrix Composites Volume 194

Author : D. L. Anton
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The MRS Symposium Proceeding series is an internationally recognised reference suitable for researchers and practitioners.

Development of Intelligent Processing Methodology for Intermetallic Matrix Composites

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It is proposed to develop processing tools for a broad, new family of in-situ metal matrix composites based upon the innovative use of multilithic reinforcement strategies. Intermetallic matrix composites (IMCs), reinforced with a dispersed ceramic phase, will be incorporated into metallic matrices to serve as reinforcing entities within the resulting multilithic reinforced composite (MRC). IMC-reinforcement in metallic matrices is particularly novel since they can be created to possess low temperature strengths normally unique to structural ceramics, and retain a metallic like ability to be deformed at high temperatures. When combined with creative processing methodologies, such composites will offer an unprecedented degree of microstructural and property design capability. When specifically applied to light metal matrices, the composites will possess the normally elusive combination of high specific strength, thermomechanical stability, economy of processing, and increased use-temperature capability. While the concept of an IMC reinforced metal matrix composite can be broadly extended to a wide range of conceivable processing methodologies and composite geometries, deformation processing techniques have been selected for this effort as the approach whereby the best properties of both the IMC and matrix components can be most efficiently and synergistically applied. For example, through the imposition of high temperature, powder based extrusion, an aligned MRC can be created if the metal matrix and the IMC reinforcement deform commensurably.

Intermetallic Matrix Composites III Volume 350

Author : J. A. Graves
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The MRS Symposium Proceeding series is an internationally recognised reference suitable for researchers and practitioners.

Low density High strength Intermetallic Matrix Composites by XD trademark Synthesis

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There is an increasing need for lightweight high performance materials in today's aerospace arena. High temperature engine designs, for example, require engine materials with elevated temperature strength, creep resistance, damage tolerance, oxidation resistance, and low density. Ordered intermetallics are considered potential alternatives to superalloys because they exhibit many of these properties. A major problem with most ordered alloys is their tendency toward inherently low ductility. The reasons can be quite varied depending on the alloy system, and include poor grain-boundary cohesion, an insufficient number of available slip systems (primarily in non-cubic alloys), limited cross slip, and impurity locking of dislocations. However, intermetallics of high symmetry, such as the L12 structure, have a number of slip systems, which can provide some plasticity, at least at intermediate temperatures, thus enabling the matrix to accommodate some of the strain associated with the thermal stresses.

Thermal Stress Effects in Intermetallic Matrix Composites

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Intermetallic Matrix Composites Via In situ Displacement Reactions

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Among the obstacles encountered in the development of intermetallic matrix composites are (1) the thermodynamic and mechanical incompatibility between the matrix and reinforcement phases and (2) the matrix reinforcement interfacial properties which are not ideal from the standpoint of achieving optimum properties in the composite as a whole. In the past, the first of these problems has been addressed by coating the reinforcements with some sort of barrier or compliant layer before their introduction into the matrix. The various coating methods investigated (sol-gel, CVD, PVD) tend to be expensive, time consuming and unreliable with respect to producing sound coatings. This research program was initially concentrated on identifying more cost effective and reliable schemes for developing the requisite coatings. The basic approach is to identify simple processing schemes whereby a beneficial reaction product (or products) is produced in-situ at the interfaces between the matrix and reinforcement during consolidation or subsequent heat treatment. As the research evolved, greater focus was placed on the need to achieve a better understanding of microstructural evolution during in-situ displacement reactions and on the correlation between the evolved microstructures and the mechanical properties. In the case of silicide based IMC's, there was a clear need to determine the influence of discrete silica particles, incorporated during the consolidation of powder samples, on the mechanical properties and on both grain size and shape.

Low Density High Strength Intermetallic Matrix Composites by XD Trademark Synthesis

Author : National Aeronautics and Space Administration (NASA)
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A feasibility study was conducted to evaluate the potential of particulate composites based on low-density, L1(sub 2) trialuminide matrices for high-temperature applications. The compounds evaluated included Al22Fe3Ti8 (as a multiphase matrix), Al67Ti25Cr8, and Al66Ti25Mn9. The reinforcement consisted of TiB2 particulates. The TiB2 composites were processed by ingot and powder metallurgy techniques. Microstructural characterization and mechanical testing were performed in the hot-pressed and hot-isostatic-pressed condition. The casting were sectioned and isothermally forged into pancakes. All the materials were tested in compression as a function of temperature, and at high temperatures as a function of strain rate. The test results are discussed. Kumar, K. S. and Dipietro, M. S. and Brown, S. A. and Whittenberger, J. D. Glenn Research Center...

In situ Formation of Fiber Reinforced Intermetallic Matrix Composites

Author : Iulian Gheorghe
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Synthesis and Processing of Intermetallic Matrix Composites as Reinforcements in Metallic Matrices

Author : Raphaël Martin
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Intermetallic Matrix Composites

Author : D. L. Anton
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The MRS Symposium Proceeding series is an internationally recognised reference suitable for researchers and practitioners.

Optimization of Interfaces for Intermetallic Matrix Composites

Author : John L. Kissinger
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Numerical Simulations of Interfacial Debonding in Ductile phase Reinforced Intermetallic Matrix Composites

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The fracture toughness of brittle intermetallic compounds can be improved by ductile-phase reinforcements. Effectiveness of the ductile phase in bridging cracks, and therefore increasing, the composite toughness, is known qualitatively to depend upon the extent of debonding, between the two phases. Numerical crack-growth simulations are used here to provide semi-quantitative predictions of the influence of interfacial debonding on the macroscopic stress-displacement behavior and, hence, the fracture toughness of an idealized Pb/glass composite. The interfacial toughness required to cause debonding, characterized by a constant critical energy release rate, is varied parametrically. As expected, higher interfacial toughness results in less interphase debonding, higher composite strength, and greater ductile-phase constraint. Consequently, the increase in ductile-phase triaxiality can potentially accelerate internal void formation and growth or facilitate cleavage fracture, either of which would likely decrease the toughness of the composite.

Microstructure and Behavior of Intermetallic Matrix Composites Processed by Spray Methods

Author : Daniel Eliguisz Lawrynowicz
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Numerical Simulations of Creep in Ductile phase Toughened Intermetallic Matrix Composites

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Intermetallic Matrix Composites 3 Symposium Held in San Francisco California on April 4 6 1994 Materials Research Society Symposium Proceedings

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Partial contents: Intermetallic Overviews and Processing: Issues in potential IMC application for aerospace structures; Powder metallurgy processing of intermetallic matrix composites; Microstructure and properties of intermetallic matrix composites produced by reaction synthesis; Combustion synthesis of niobium aluminide matrix composites; Ambient temperature synthesis of bulk intermetallics; Wear behavior of SHS intermetallic matrix composites; Fracture characteristics of metal-intermetallic laminates produced by SHS reactions; and Vapor phase synthesis of Ti aluminides and the interfacial bonding effect on the mechanical property of micro-composites reinforced by pyrolized SiC fibers.

High Temperature Flow Behavior of Titanium Aluminide Intermetallic Matrix Composites

Author : Judson Sloane Marte
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