4.9 Microstructural Design of Metal Matrix Composites for High Temperature Strength and Superplastic Behavior by Strain Mismatch

2018 ◽  
pp. 242-274
Author(s):  
Glenn S. Daehn
Keyword(s):  
High Temperature ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
High Temperature Strength ◽  
Matrix Composites ◽  
Superplastic Behavior ◽  
Microstructural Design ◽  
Strain Mismatch

Solidification Microstructure Evolution Modeling in Nb-Si Based Intermetallics-Strengthened-Metal-Matrix Composites

2008 ◽  
Vol 1128 ◽  
Author(s):  
Sujoy Kar ◽  
Bernard Bewlay ◽  
Ying Yang
Keyword(s):  
High Temperature ◽  
Metal Matrix Composites ◽  
Microstructural Evolution ◽  
Metal Matrix ◽  
Fuel Efficiency ◽  
Heat Extraction ◽  
Eutectic Solidification ◽  
High Temperature Strength ◽  
Matrix Composites ◽  
Evolution Modeling

AbstractFor higher fuel efficiency and greater thrust to weight ratios, there is a continuous drive for higher performance turbine engine components. Nb-silicide intermetallics, owing to their high melting point and high-temperature strength, are potential candidates for high temperature applications. These intermetallics when precipitated in the metal matrix of a (Nb) solid solution, result in intermetallic-strengthened metal matrix composites that have a good combination of room temperature toughness and high temperature strength. The microstructures of these in-situ composites can be complex and vary significantly with the addition of elements such as Ti and Hf. Hence an improved understanding of phase stability and the microstructural evolution of these alloys is essential for alloy optimization. In the present paper we describe binary alloy microstructural evolution modeling of dendritic and eutectic solidification obtained using phasefield simulations. The effect of parameters such as heat extraction rate, the ratio of the diffusivity of the solute in liquid to solid, and the liquid-solid interfacial energy, on microstructural evolution during solidification is discussed in detail.

Damping and Mechanical Properties of (Graphite + 9Al2O3·2B2O3)/Mg Metal Matrix Composites

2004 ◽  
Vol 449-452 ◽  
pp. 657-660
Author(s):  
Il Dong Choi ◽  
Dong Min Kim ◽  
Kyung Mok Cho ◽  
Ik Min Park
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Volume Fraction ◽  
Damping Capacity ◽  
High Temperature Strength ◽  
Al Alloy ◽  
Matrix Composites ◽  
Graphite Particles

Mg alloys have potential to use automotive parts because of their weight and castability. High temperature strength and damping capacity is important to the automotive power train parts. Mg alloy has lower creep and thermal fatique strength but has better damping capacity than Al alloy. It is known that short fiber reinforced Mg metal matrix composites(MMC) exhibits superior high temperature strength and graphite reinforced Mg MMC shows excellent damping capacity. Therefore, in this study, the effect of graphite particles(15-25%) and alborex (9Al2O3ּ2B2O3) whiskers(5-15%) on the damping behavior and mechanical properties of Mg MMC was studied. Graphite particles and alborex whiskers were chosen to increase damping capacity and high temperature strength, respectively. The Mg MMC was fabricated by squeeze casting and the total quantity of reinforcements(graphite + alborex) was maintained to 30 volume percent. The damping capacity of the metal matrix composites was increased and the flexural strength and hardness were decreased with increasing the volume fraction of graphite particles, that is, reducing the volume fraction of alborex whiskers.

scholarly journals Ytterbium Silicate Fibers: Fabrication, Microstructure and Strength

Fibers ◽  
2019 ◽  
Vol 7 (12) ◽  
pp. 104
Author(s):  
Sergei Mileiko ◽  
Andrew Kolchin ◽  
Olga Shakhlevich ◽  
Sergei Galyshev ◽  
Maxim Nikonovich
Keyword(s):  
Water Vapor ◽  
High Temperature ◽  
Metal Matrix Composites ◽  
Hot Corrosion ◽  
Metal Matrix ◽  
Matrix Composites ◽  
Loading Conditions ◽  
The Family ◽  
Ytterbium Silicate ◽  
Interface Materials

High temperature ceramic and metal matrix composites, which are to be used under complicated loading conditions in a severe atmosphere, have to satisfy a large number of the requirements. Hence, development of such composites calls for a large variety of fibers, matrices and interface materials to make an appropriate choice in designing a particular composite. The fiber is definitely the most important component of a composite. The family of oxide fibers is the most important among possible reinforcements for metal and oxide matrices. In this work, a family of potential oxide reinforcements containing ytterbium monosilicate Yb2SiO5 and disilicate Yb2Si2O7, and ytterbia-ytterbium monosilicate eutectic, was obtained and studied. The interest in those silicates was aroused because (i) they are highly resistant to hot corrosion in the presence of water vapor and (ii) their CTE varies from 8 × 10−6 K−1 for monosilicate to 4 × 10−6 K−1 for disilicate.

High Temperature Damping in Metal Matrix Composites

1993 ◽  
Vol 126-128 ◽  
pp. 671-674
Author(s):  
Andre Rivière ◽  
L. Fadel ◽  
J. Woirgard
Keyword(s):  
High Temperature ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Matrix Composites
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