Award Date

1-1-2005

Degree Type

Thesis

Degree Name

Master of Science (MS)

Department

Mechanical Engineering

First Committee Member

Ajit K. Roy

Number of Pages

125

Abstract

Zr705 and Nb7.5Ta have been tested for evaluation of their metallurgical and corrosion properties for applications in nuclear hydrogen generation using an S-I cycle based on the HIx decomposition process. The results of tensile testing involving both alloys indicate that the tensile strength was gradually reduced with increasing temperature, as expected. Further, the ductility for both alloys was reduced at some critical temperatures, possibly due to the dynamic strain-aging effect. Zr705 did not exhibit cracking in acidic aqueous solutions, both under constant-load and self-loaded conditions. The stress-corrosion-cracking (SCC) tests of Zr705 in an acidic solution showed reduced true failure stress but enhanced ductility at elevated temperatures. With respect to the SCC susceptibility of Nb7.5Ta in an identical environment, slight change in failure strain was noted at different temperatures. The critical potentials determined in localized corrosion study became more active with increasing temperature. The application of anodic and cathodic potentials enhanced the cracking susceptibility of Zr705. Dimpled microstructures, characteristic of ductile failure, were observed in both materials.

Keywords

Application; Characterization; Decomposition Hix; Material; Structural

Controlled Subject

Mechanical engineering

File Format

pdf

File Size

3430.4 KB

Degree Grantor

University of Nevada, Las Vegas

Language

English

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