Master of Science (MS)
First Committee Member
Ajit K. Roy
Number of Pages
Nb7.5Ta, a candidate refractory material for use in the HI, decomposition process, has been tested for evaluation of its tensile properties and corrosion resistance. The results of tensile testing within a temperature range of ambient to 400Ã‚Â°C revealed a gradual drop in tensile strength with increasing temperature. However, reduced failure strain was observed at temperatures up to 300Ã‚Â°C, suggesting the occurrence of dynamic strain aging (DSA) behavior. The characterization of the tensile specimens by transmission electron microscopy showed somewhat higher dislocation density at 300Ã‚Â°C that could be the result of the DSA effect. Corrosion studies under a slow strain rate condition in an acidic solution exhibited enhanced cracking tendency at 90Ã‚Â°C, suggesting a detrimental effect of higher temperature on the cracking susceptibility. No failures were observed under a constant-load condition. An application of a cathodic controlled potential to the test specimen resulted in enhanced cracking tendency in terms of failure strain. The morphology of failure, determined by a scanning electron microscope, was ductile in all tested specimens.
Characterizaton; Decomposition; Hix; Nb7; Process
Mechanical engineering; Materials science
University of Nevada, Las Vegas
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Kondur, Venkateswarlu, "Characterizaton of Nb75Ta for Hix decomposition process" (2006). UNLV Retrospective Theses & Dissertations. 2060.