Sigma phase in the ternary systems chromium-cobalt-copper and chromium-manganese-copper

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dc.contributor.authorDeBoskey, Wentzle R.en
dc.contributor.committeechairSprinkle, J. K.en
dc.contributor.committeememberPardue, Louis A.en
dc.contributor.committeememberWhittemore, John A.en
dc.contributor.departmentMetallurgical Engineeringen
dc.date.accessioned2014-03-14T21:28:46Zen
dc.date.adate2013-02-07en
dc.date.available2014-03-14T21:28:46Zen
dc.date.issued1955-11-05en
dc.date.rdate2013-02-07en
dc.date.sdate2013-02-07en
dc.description.abstractThe initial part of this investigation was to determine the ternary isothermal sections for the Cr-Co-Cu system and the Crâ Mm-Cu system at lOOO°C. and 975°C., respectively. This was done by vacuum melting the Cr-Co~Cu alloys and annealing these alloys in an inert atmosphere of a helium-hydrogen gas mixture. The Cr-Mn-Cu alloys were melted under a helium atmosphere and annealed in evacuated Vycor tubes. By the use of metallographic techniques and x-ray analysis the phases present in each alloy were determined and the two ternary isotherml sections constructed. It was found that copper had a very limited solid solubility in the sign phase of both systems. The sigma field in the Cr-Co-Cu 1000°C. ternary isothermal comes into equilibrium with the terminal solid solutions of chromium, cobalt, and copper. In the Cr-Mn-Cu ternary isothermal section sigma comes into equilibrium with the terminal solid solution of chromium and cobalt and the face-centered cubic solid solution of copper in manganese. From these data the electron vacancy scheme(16) may not be extended to include copper due to the limited solid solubility of copper in sigma. Also, the extent of copper solubility in the sigmas cannot be related to the solubility of the copper in cobalt or manganese.en
dc.description.degreeMaster of Scienceen
dc.format.extent75 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-02072013-040036en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-02072013-040036/en
dc.identifier.urihttp://hdl.handle.net/10919/40972en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1955.D426.pdfen
dc.relation.isformatofOCLC# 25754638en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1955.D426en
dc.subject.lcshTransition metal alloysen
dc.titleSigma phase in the ternary systems chromium-cobalt-copper and chromium-manganese-copperen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineMetallurgical Engineeringen
thesis.degree.grantorVirginia Polytechnic Instituteen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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