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MAXMETs: MAX-Reinforced Metal Matrix Composites: A Study on the Effect of Texture on Kinking Non-Linear Elasticity of Ti2AlC/Nanocrystalline Mg-Matrix Composites - Couverture souple

Amini, Shahram

 
9783639203646: MAXMETs: MAX-Reinforced Metal Matrix Composites: A Study on the Effect of Texture on Kinking Non-Linear Elasticity of Ti2AlC/Nanocrystalline Mg-Matrix Composites
Couverture souple
ISBN 10 : 363920364X ISBN 13 : 9783639203646
Editeur : VDM Verlag, 2009

Synopsis

The MAX phases and hexagonal metals, among many other plastically anisotropic solids with c/a ratios > 1.5, have been recently classified as kinking nonlinear elastic (KNE) solids ? the signature of which is the formation of fully reversible, hysteretic stress-strain loops during cyclic loadings. Herein, a unique and novel class of Mg matrix composites reinforced with Ti2AlC was fabricated, for the first time, by spontaneous melt infiltration. The ~ 35 nm Mg grains that constituted the matrix of these composites were exceptionally stable: repeatedly heating the composite to 700 °C ? 50 °C above the melting point of Mg ? remarkably did not lead to any coarsening. To make these composites, all one needs to do is melt bulk Mg above a porous preform of Ti2AlC; nature does the rest. Because kinking is a form of plastic instability, orienting the Ti2AlC grains, prior to infiltration, with their basal planes parallel to the loading direction led to exceptionally high values of dissipated energy per unit volume per cycle, Wd. At 450 MPa, Wd of these composites with this texture was found to be ? 0.6 MJ/m3, believed to be the highest ever reported for a crystalline solid.

Les informations fournies dans la section « Synopsis » peuvent faire référence à une autre édition de ce titre.

Présentation de l'éditeur

The MAX phases and hexagonal metals, among many other plastically anisotropic solids with c/a ratios > 1.5, have been recently classified as kinking nonlinear elastic (KNE) solids ? the signature of which is the formation of fully reversible, hysteretic stress-strain loops during cyclic loadings. Herein, a unique and novel class of Mg matrix composites reinforced with Ti2AlC was fabricated, for the first time, by spontaneous melt infiltration. The ~ 35 nm Mg grains that constituted the matrix of these composites were exceptionally stable: repeatedly heating the composite to 700 °C ? 50 °C above the melting point of Mg ? remarkably did not lead to any coarsening. To make these composites, all one needs to do is melt bulk Mg above a porous preform of Ti2AlC; nature does the rest. Because kinking is a form of plastic instability, orienting the Ti2AlC grains, prior to infiltration, with their basal planes parallel to the loading direction led to exceptionally high values of dissipated energy per unit volume per cycle, Wd. At 450 MPa, Wd of these composites with this texture was found to be ? 0.6 MJ/m3, believed to be the highest ever reported for a crystalline solid.

Biographie de l'auteur

2005-2009, Ph.D. Drexel University, Philadelphia, Pennsylvania, USA. 2003-2005, Visiting Researcher, Queen Mary University of London, UK. 2003-2005, Mathematics Lecturer, International House London, UK. 2000-2003, M.Sc. Shiraz University, School of Engineering, Shiraz, Iran. 1995-2000, B.Sc. Sharif University of Technology, Tehran, Iran.

Les informations fournies dans la section « A propos du livre » peuvent faire référence à une autre édition de ce titre.

Éditeur
VDM Verlag
Date d'édition
2009
Langue
anglais
ISBN 10 
363920364X
ISBN 13 
9783639203646
Reliure
Broché
Nombre de pages
272
Coordonnées du fabricant
non disponible
Personne responsable
non disponible