chapter(5) - Chapter 5, matrices and Reinforcements of MMCs...

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Chapter 5, matrices and Chapter 5, matrices and Reinforcements of MMCs Reinforcements of MMCs Department of materials science and Department of materials science and engineering Jilin University engineering Jilin University Professor Yu-guang ZHAO Professor Yu-guang ZHAO
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Introduction Introduction The possibility of taking advantage of particular properties of the constituent materials to meet specific demands is the most important motivation for the development of composites. A more restrictive definition is used by industries and materials scientists: a composite is a material that consists of constituents produced via a physical combination of pre-existing ingredient materials to obtain a new material with unique properties when compared to the monolithic material properties. This definition distinguishes a composite from other multiphase materials which are produced by bulk processes where one or more phases result from phase transformation ("in-situ" composites). The terms matrix and reinforcement are often used. The matrix is a percolating “soft” phase (with in general excellent ductility, formability and thermal conductivity) in which are embedded the “hard” reinforcements (high stiffness, hardness, and low thermal expansion). The reinforcements can be continuous or discontinuous, orientated or disorientated. The composites are classified by: (1) their matrix (polymer, ceramic, metal), (2) their reinforcement, which includes the chemical nature (oxides, carbides, nitrides), shape (continuous fibers, short fibers, whiskers, particulates) and orientation, (3) their processing routes.
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5.1 Matrix Materials 5.1 Matrix Materials Choice principia of the matrices 1) Using requirement of MMCs( 金金金金金金金金金金金金 ) 2) Constitute characteristic of MMCs( 金金金金金金金金金金金 ) 3) Compatibility between metal matrix and reinforcement ( 金金金金金金金金金金金金 ) Classification of matrices 1) Matrix for structural MMCs ( 金金金金金金金金金 ) 2) Matrix for functional MMCs ( 金金金金金金金金金金 )
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Matrix Alloy Systems Matrix Alloy Systems The selection of suitable matrix alloys is mainly determined by the intended application of the composite material. With the development of light metal composite materials that are mostly easy to process, conventional light metal alloys are applied as matrix materials. In the area of powder metallurgy special alloys can be applied due to the advantage of fast solidification during the powder production. Those systems are free from segregation problems that arise in conventional solidification. Also the application of systems with oversaturated or metastable structures is possible. For functional materials non-alloyed or low-alloyed non-
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chapter(5) - Chapter 5, matrices and Reinforcements of MMCs...

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