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Rehn, Lynn E., Wayman, C. Marvin Erck, Robert Alan 2014-12-16T20:52:19Z 2014-12-16T20:52:19Z 10000-01-01 1988 1988 Radiation-induced solute segregation and precipitation in molybdenum-rhenium solid-solution alloys were studied during elevated-temperature helium- and neon-ion irradiation. Radiation-induced segregation of Re atoms in the same direction as the defect fluxes, that is, toward the external surface, was measured during irradiation by in situ Rutherford backscattering spectrometry (RBS). The results of the segregation measurements were in agreement with theoretical models based on point-defect driven transport of solute atoms toward point-defect sinks. After irradiation, near-surface microstructural changes were studied using transmission-electron microscopy (TEM). Radiation-induced chi-phase precipitates were identified. The precipitates adopted coincident and (111) twin orientations with respect to the matrix. The twinning morphology was explained in terms of a coincident-site-lattice model. The results of the RBS and TEM studies constitute strong evidence that precipitation of the chi phase occurs in Mo-Re solid-solution alloys when radiation-induced solute segregation causes the equilibrium solubility limit to be exceeded near point-defect sinks. Made available in DSpace on 2014-12-16T20:52:19Z (GMT). No. of bitstreams: 1 8908673.pdf: 5821313 bytes, checksum: f5c85fdde8a0035545a29f59c1613076 (MD5) Previous issue date: 1988 Embargo set by: Seth Robbins for item 72021 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 213 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1988. http://hdl.handle.net/2142/71855 (UMI)AAI8908673 Engineering, Nuclear Engineering, Metallurgy Engineering, Materials Science Radiation-Induced Segregation and Precipitation in Ion-Irradiated Molybdenum-Rhenium Alloys text Metallurgy and Mining Engineering Metallurgical Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.