Masters Theses

Keywords and Phrases

Additive manufacturing; Bulk metallic glasses; High entropy alloys

Abstract

"Additive manufacturing in the form of laser deposition is a unique way to manufacture near net shape metallic components from advanced materials. Rapid solidification facilitates the extension of solid solubility, compositional flexibility and decrease in micro-segregation in the melt among other advantages. The current work investigates the employment of laser deposition to fabricate the following:

1. Functionally gradient materials: This allows grading dissimilar materials compositionally to tailor specific properties of both these materials into a single component. Specific compositions of the candidate materials (SS 316, Inconel 625 and Ti64) were blended and deposited to study the brittle intermetallics reported in these systems.

2. High entropy alloys: These are multi- component alloys with equiatomic compositions of 5 or more elements. The ratio of Al to Ni was decreased to observe the transition of solid solution from a BCC to an FCC crystal structure in the AlFeCoCrNi system.

3. Structurally amorphous alloys: Zr-based metallic glasses have been reported to have high glass forming ability. These alloys have been laser deposited so as to rapidly cool them from the melt into an amorphous state.

Microstructural analysis and X-ray diffraction were used to study the phase formation, and hardness was measured to estimate the mechanical properties."--Abstract, page iii.

Advisor(s)

Newkirk, Joseph William

Committee Member(s)

Liou, Frank W.
Zhou, Caizhi

Department(s)

Materials Science and Engineering

Degree Name

M.S. in Materials Science and Engineering

Sponsor(s)

United States. National Aeronautics and Space Administration
Boeing Company
Rolls-Royce (1971) Ltd.

Publisher

Missouri University of Science and Technology

Publication Date

Spring 2014

Pagination

xiii, 89 pages

Note about bibliography

Includes bibliographical references (pages 85-88).

Rights

© 2014 Harihar Rakshit Sistla, All rights reserved.

Document Type

Thesis - Restricted Access

File Type

text

Language

English

Subject Headings

Pulsed laser depositionMetallic glassesFunctionally gradient materialsMaterials at high temperaturesMetals -- Rapid solidification processing

Thesis Number

T 10478

Electronic OCLC #

882554745

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