Theses and Dissertations

Date of Award

6-1-2024

Document Type

Thesis

Degree Name

Master of Science in Engineering (MSE)

Department

Manufacturing Engineering

First Advisor

Jianzhi Li

Second Advisor

Farid Ahmed

Third Advisor

Yangyang Long

Abstract

High-temperature strength and high environmental resistance are necessary characteristics for materials under extreme working conditions in aerospace, nuclear, and chemical industries. In this study, a novel refractory medium entropy alloy (MEA) was developed from tungsten (W), titanium (Ti), and molybdenum (Mo) via an additive manufacturing process, selective laser melting (SLM). Through process optimization, (i) the formation of brittle intermediate phases was suppressed, (ii) the complete melting of tungsten particles was achieved, and (iii) a pure solid solution was formed. Due to the addition of Ti and Mo, the resultant alloy showed outstanding high-temperature strength compared to other tungsten alloys. The effects of process parameters on the mechanical properties were analyzed to understand the characteristics of complex layer-by-layer structures. The feasibility of manufacturing defect-less refractory MEA composed of a solid solution phase delivers high potentials of laser-based additive manufacturing in functional material development.

Comments

Copyright 2024 Lindsey A. Salazar. https://proquest.com/docview/3115241674

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