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ndltd-OhioLink-oai-etd.ohiolink.edu-ucin1117208454
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oai_dc
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ndltd-OhioLink-oai-etd.ohiolink.edu-ucin11172084542021-08-03T06:10:28Z DEVELOPMENT OF A FINITE VOLUME MODEL FOR THE HIGH-DENSITY INFRARED PROCESSING OF γ-TiAl THIN-GAGE SHEET RIVARD, JOHN DANIEL KENNEDY A new method for the rapid processing of thin gage sheet of traditionally difficult-to-process materials has been developed. The method uses high density infrared (HDI) rapid heating of a plasma arc lamp to liquid phase sinter powder metal compact precursors to a dense structure. Using this method, intermetallic sheet can be produced in a fraction of the time at a significant cost savings over traditional processing methods. In this work, γ-TiAl sheet was produced using HDI from powder precursors. A mathematical model was developed in order to determine lamp processing parameters. The model was developed using nickel materials. The model uses a comprehensive set of thermophysical data to predict temperature fields and phase changes during processing. The model was extended to the γ-TiAl material system. With the aid of the model, processing parameters were determined which allowed for a temperature gradient across the sheet that would produce a liquid phase cast structure on the surface, residual powder on the backside, and a middle layer solid+liquid zone. The later region produced an optimal fine grain, lamellar microstructure that yields the best mechanical properties. The model also reduced costs by removing the need for front end experiments. Post-processing investigations showed that HDI was an effective tool for producing sheet. Measurements of density and mechanical properties revealed that HDI produced γ-TiAl was >99% dense and had a tensile strength of 428MPa and ductility of 0.55%. Light Microscope investigation showed the predicted fine grain, lamellar microstructure was achieved. Results of HDI processing were compared to material processed by traditional methods. 2005-05-27 English text University of Cincinnati / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=ucin1117208454 http://rave.ohiolink.edu/etdc/view?acc_num=ucin1117208454 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
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NDLTD
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| language |
English
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NDLTD
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| author |
RIVARD, JOHN DANIEL KENNEDY
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| spellingShingle |
RIVARD, JOHN DANIEL KENNEDY
DEVELOPMENT OF A FINITE VOLUME MODEL FOR THE HIGH-DENSITY INFRARED PROCESSING OF γ-TiAl THIN-GAGE SHEET
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| author_facet |
RIVARD, JOHN DANIEL KENNEDY
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| author_sort |
RIVARD, JOHN DANIEL KENNEDY
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| title |
DEVELOPMENT OF A FINITE VOLUME MODEL FOR THE HIGH-DENSITY INFRARED PROCESSING OF γ-TiAl THIN-GAGE SHEET
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| title_short |
DEVELOPMENT OF A FINITE VOLUME MODEL FOR THE HIGH-DENSITY INFRARED PROCESSING OF γ-TiAl THIN-GAGE SHEET
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| title_full |
DEVELOPMENT OF A FINITE VOLUME MODEL FOR THE HIGH-DENSITY INFRARED PROCESSING OF γ-TiAl THIN-GAGE SHEET
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| title_fullStr |
DEVELOPMENT OF A FINITE VOLUME MODEL FOR THE HIGH-DENSITY INFRARED PROCESSING OF γ-TiAl THIN-GAGE SHEET
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| title_full_unstemmed |
DEVELOPMENT OF A FINITE VOLUME MODEL FOR THE HIGH-DENSITY INFRARED PROCESSING OF γ-TiAl THIN-GAGE SHEET
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| title_sort |
development of a finite volume model for the high-density infrared processing of γ-tial thin-gage sheet
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| publisher |
University of Cincinnati / OhioLINK
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| publishDate |
2005
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| url |
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1117208454
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| work_keys_str_mv |
AT rivardjohndanielkennedy developmentofafinitevolumemodelforthehighdensityinfraredprocessingofgtialthingagesheet
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| _version_ |
1719432136664023040
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