\"The ductility of intermetallics has long been a hindrance to their broad adaptation despite a significant range of properties such as magnetic, half-metallic, and shape memory behavior. The lack of a general theory for the ductility of intermetallics along with the lack of prior art that experimentally measured mechanical properties drives the need for significant investment in many of these novel magnetic materials in order to even understand, let alone correct, poor ductility.
This dissertation includes work that explored the effect of vanadium content and quenching rate on the microstructure and ductility of Fe-Co alloys. Results indicated that a martensitic transformation was responsible for the observed property changes with additions of vanadium as low as 1.77 at. % and at cooling rates as slow as 0.167 °C/s.
A novel technique for predicting the ductility of intermetallics through the use of density functional theory calculations was developed to explain the observed improvements with vanadium additions. The model predicts, and experiments validate, that improved ductility in Fe-Co alloys occurs because vanadium additions drive changes in the anti-phase boundary energies which enable easier cross-slip and thus a shift in fracture mode to transgranular cleavage.
Finally, the developed intermetallic ductility model was applied to the inverse Huesler alloy Mn2CoAl. Results indicated that Mn2CoAl is brittle. Changes in stoichiometry were predicted to enable changes in the anti-phase boundary energies and cross-slip energies, but these changes are not sufficient to overcome the driving force for intergranular fracture\"--Abstract, p. iv
","abstract_html":"<p>"The ductility of intermetallics has long been a hindrance to their broad adaptation despite a significant range of properties such as magnetic, half-metallic, and shape memory behavior. The lack of a general theory for the ductility of intermetallics along with the lack of prior art that experimentally measured mechanical properties drives the need for significant investment in many of these novel magnetic materials in order to even understand, let alone correct, poor ductility.</p> <p>This dissertation includes work that explored the effect of vanadium content and quenching rate on the microstructure and ductility of Fe-Co alloys. Results indicated that a martensitic transformation was responsible for the observed property changes with additions of vanadium as low as 1.77 at. % and at cooling rates as slow as 0.167 °C/s.</p> <p>A novel technique for predicting the ductility of intermetallics through the use of density functional theory calculations was developed to explain the observed improvements with vanadium additions. The model predicts, and experiments validate, that improved ductility in Fe-Co alloys occurs because vanadium additions drive changes in the anti-phase boundary energies which enable easier cross-slip and thus a shift in fracture mode to transgranular cleavage.</p> <p>Finally, the developed intermetallic ductility model was applied to the inverse Huesler alloy Mn<sub>2</sub>CoAl. Results indicated that Mn<sub>2</sub>CoAl is brittle. Changes in stoichiometry were predicted to enable changes in the anti-phase boundary energies and cross-slip energies, but these changes are not sufficient to overcome the driving force for intergranular fracture"--Abstract, p. iv</p>","abstract_has_math":false,"creators":["Everhart, Wesley Alexander"],"institution":"Missouri University of Science and Technology","degree_name":"Ph. D. in Materials Science and Engineering","degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":null,"date_issued":"","date_published":null,"updated_at":"2026-07-24T03:18:18Z","subjects":["Materials Science and Engineering"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://scholarsmine.mst.edu/doctoral_dissertations/3248","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Everhart, Wesley Alexander"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:type","label":"Dc Type","values":["Dissertation - Open Access"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph. D. in Materials Science and Engineering"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Missouri University of Science and Technology"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Materials Science and Engineering"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://scholarsmine.mst.edu/doctoral_dissertations/3248"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["\"The ductility of intermetallics has long been a hindrance to their broad adaptation despite a significant range of properties such as magnetic, half-metallic, and shape memory behavior. The lack of a general theory for the ductility of intermetallics along with the lack of prior art that experimentally measured mechanical properties drives the need for significant investment in many of these novel magnetic materials in order to even understand, let alone correct, poor ductility.
This dissertation includes work that explored the effect of vanadium content and quenching rate on the microstructure and ductility of Fe-Co alloys. Results indicated that a martensitic transformation was responsible for the observed property changes with additions of vanadium as low as 1.77 at. % and at cooling rates as slow as 0.167 °C/s.
A novel technique for predicting the ductility of intermetallics through the use of density functional theory calculations was developed to explain the observed improvements with vanadium additions. The model predicts, and experiments validate, that improved ductility in Fe-Co alloys occurs because vanadium additions drive changes in the anti-phase boundary energies which enable easier cross-slip and thus a shift in fracture mode to transgranular cleavage.
Finally, the developed intermetallic ductility model was applied to the inverse Huesler alloy Mn2CoAl. Results indicated that Mn2CoAl is brittle. Changes in stoichiometry were predicted to enable changes in the anti-phase boundary energies and cross-slip energies, but these changes are not sufficient to overcome the driving force for intergranular fracture\"--Abstract, p. iv
"]},{"key":"dc:title","label":"Title","values":["NOVEL FERROMAGNETIC MATERIALS WITH IMPROVED MECHANICAL PERFORMANCE"]}]}],"canonical_facts":{"dc:creator":["Everhart, Wesley Alexander"],"dc:description.abstract":["\"The ductility of intermetallics has long been a hindrance to their broad adaptation despite a significant range of properties such as magnetic, half-metallic, and shape memory behavior. The lack of a general theory for the ductility of intermetallics along with the lack of prior art that experimentally measured mechanical properties drives the need for significant investment in many of these novel magnetic materials in order to even understand, let alone correct, poor ductility.
This dissertation includes work that explored the effect of vanadium content and quenching rate on the microstructure and ductility of Fe-Co alloys. Results indicated that a martensitic transformation was responsible for the observed property changes with additions of vanadium as low as 1.77 at. % and at cooling rates as slow as 0.167 °C/s.
A novel technique for predicting the ductility of intermetallics through the use of density functional theory calculations was developed to explain the observed improvements with vanadium additions. The model predicts, and experiments validate, that improved ductility in Fe-Co alloys occurs because vanadium additions drive changes in the anti-phase boundary energies which enable easier cross-slip and thus a shift in fracture mode to transgranular cleavage.
Finally, the developed intermetallic ductility model was applied to the inverse Huesler alloy Mn2CoAl. Results indicated that Mn2CoAl is brittle. Changes in stoichiometry were predicted to enable changes in the anti-phase boundary energies and cross-slip energies, but these changes are not sufficient to overcome the driving force for intergranular fracture\"--Abstract, p. iv
"],"dc:identifier":["https://scholarsmine.mst.edu/doctoral_dissertations/3248"],"dc:subject":["Materials Science and Engineering"],"dc:title":["NOVEL FERROMAGNETIC MATERIALS WITH IMPROVED MECHANICAL PERFORMANCE"],"dc:type":["Dissertation - Open Access"],"thesis:degree_name":["Ph. D. in Materials Science and Engineering"],"thesis:institution_name":["Missouri University of Science and Technology"]},"updated_at":"2026-07-24T03:18:18Z"}