Modifying Bulk Metallic Glasses: Composites and Configurational States

Author: Kozachkov, Henry

Year: 2015

Degree: Dissertation (Ph.D.)

Advisors: Johnson, William Lewis; Hofmann, Douglas C.

Committee Members: Fultz, Brent T.; Johnson, William Lewis; Hofmann, Douglas C.; Ravichandran, Guruswami; Faber, Katherine T.

Option: Applied Physics

DOI: 10.7907/Z9JQ0XZ4

Abstract

Bulk metallic glasses (BMGs) maybe be considered to share some of the same inherent trade-offs as engineering ceramics. While BMGs typically exhibit high yield strengths, and while some have surprising fracture toughness, they exhibiting little to no tensile ductility, and fail in a brittle manner under uniaxial loading. Speaking broadly, there are two complimentary approaches to improving on these shortcomings: 1) create bulk metallic glass matrix composites (BMGMCs) and 2) improve the properties of a monolithic BMG. The structure of this thesis mirrors this division, with chapters 2-7 focusing on creating and processing amorphous metal matrix composites, and chapter 8 focusing on modifying the properties of a monolithic BGM by altering its configurational state through irradiation.

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