Codeformation Processing of Mechanically-Dissimilar Metal/Intermetallic Composites

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dc.contributor.authorMarte, Judson Sloanen
dc.contributor.committeechairKampe, Stephen L.en
dc.contributor.committeememberReynolds, William T. Jr.en
dc.contributor.committeememberSturges, Robert H.en
dc.contributor.committeememberCrowe, C. Roberten
dc.contributor.committeememberChristodoulou, Leonitusen
dc.contributor.committeememberAning, Alexander O.en
dc.contributor.departmentMaterials Science and Engineeringen
dc.date.accessioned2014-03-14T20:11:19Zen
dc.date.adate2000-07-14en
dc.date.available2014-03-14T20:11:19Zen
dc.date.issued1999-01-12en
dc.date.rdate2001-07-14en
dc.date.sdate2000-05-01en
dc.description.abstractA systematic and scientific approach has been applied to the study of codeformation processing. A series of composites having mechanically-dissimilar phases were developed in which the high temperature flow behavior of the reinforcement material could be varied independent of the matrix. This was accomplished through the use of a series of intermetallic matrix composites (IMCs) as discontinuous reinforcements in an otherwise conventional metal matrix composite. The IMCs are produced using an in-situ reaction synthesis technique, called the XD™ process. The temperature of the exothermic synthesis reaction, called the adiabatic temperature, has been calculated and shown to increase with increasing volume percentage of TiB2 reinforcement. Further, this temperature has been shown to effect the size and spacing of the TiB2, microstructural features which are often used in discontinuous composite strength models. Study of the high temperature flow behavior of the components of the metal/IMC composite is critical to the development of an understanding of codeformation. A series of compression tests performed at 1000° to 1200°C and strain-rates of 10-3 and 10-4 sec-1. Peak flow stresses were used to evaluate the influence of material properties and process conditions. These data were incorporated into phenomenologically-based constitutive equations that have been used to predict the flow behavior. It has been determined that plastic deformation of the IMCs occurs readily, and is largely TiB2 independent, at temperatures approaching the melting point of the intermetallic matrices.en
dc.description.degreePh. D.en
dc.identifier.otheretd-05012000-11530012en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-05012000-11530012/en
dc.identifier.urihttp://hdl.handle.net/10919/27463en
dc.publisherVirginia Techen
dc.relation.haspartJud_Marte_thesis.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectReaction Synthesisen
dc.subjectPowder Metallurgyen
dc.subjectExtrusionen
dc.subjectIntermetallic Matrix Compositesen
dc.subjectMetal Matrix Compositesen
dc.subjectCodeformationen
dc.titleCodeformation Processing of Mechanically-Dissimilar Metal/Intermetallic Compositesen
dc.typeDissertationen
thesis.degree.disciplineMaterials Science and Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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