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Abstract : The primary objective of this project was to study the processing and high-temperature deformation of laminated Nb/Nb5Si3 composites. Our initial goal was to control the grain size and porosity present in the Nb5Si3 silicide phase of the composite by developing improved processing techniques. For this part of the project we investigated four processing routes including hot pressing during annealing, vapor deposition onto a heated substrate, annealing under a large thermal gradient, and hot pressmg elemental Nb/Si microlaminates. The final processing method proved most promising and demonstrated that full dense Nb/Nb5Si3 microlaminates can be processed with large grains and no metastable phases. Our subsequent goal was to characterize the deformation of Nb/Nb5Si3 microlaminates at high temperatures and determine the controlling deformation mechanisms in both phases. We demonstrated that the creep rate of the silicide phase at 1000 degrees centigrade and 1100 degrees centigrad
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Abstract : The primary objective of this project was to study the processing and high-temperature deformation of laminated Nb/Nb5Si3 composites. Our initial goal was to control the grain size and porosity present in the Nb5Si3 silicide phase of the composite by developing improved processing techniques. For this part of the project we investigated four processing routes including hot pressing during annealing, vapor deposition onto a heated substrate, annealing under a large thermal gradient, and hot pressmg elemental Nb/Si microlaminates. The final processing method proved most promising and demonstrated that full dense Nb/Nb5Si3 microlaminates can be processed with large grains and no metastable phases. Our subsequent goal was to characterize the deformation of Nb/Nb5Si3 microlaminates at high temperatures and determine the controlling deformation mechanisms in both phases. We demonstrated that the creep rate of the silicide phase at 1000 degrees centigrade and 1100 degrees centigrad
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