Date of Award
Master of Science
Materials Science and Engineering
Karl A. Gschneidner, Jr.
Intermetallic compounds are a class of materials that are often characterized by low density, good oxidation resistance, attractive high temperature mechanical properties, as well as good electrical and magnetic properties. However, few practical uses have emerged due to the inherent brittleness of these materials at room temperature, making them difficult to fabricate. Often the ductility of intermetallics can be increased by making them off-stoichiometry or by doping them with third element additions. However, a subset of binary B2 intermetallics consisting of one rare earth metal and one non-rare earth metal have been discovered to exhibit extensive ductility without the need for such special conditions. Two of these compounds, YMg and CeMg, were characterized in this study. Mechanical properties were examined by performing tensile, compression, and microhardness tests. Scanning electron microscopy (SEM) was utilized to analyze these samples. The oxidation properties of both compounds were also studied. Thermal gravimetric analysis (TGA) was employed to obtain oxidation curves that were then fit to kinetic rate laws. Finally, the oxidation behaviors of YMg and CeMg were analyzed using energy dispersive spectroscopy (EDS) and x-ray diffraction (XRD) to determine the reaction progression of the oxidation process.
Digital Repository @ Iowa State University, http://lib.dr.iastate.edu
Brad David Stumphy
Stumphy, Brad David, "Mechanical and oxidation properties of some B2 rare earth-magnesium intermetallic compounds (RMg; R = Y, Ce) " (2006). Retrospective Theses and Dissertations. 872.