Faculty Advisor or Committee Member

Winston Soboyejo, Advisor

Faculty Advisor or Committee Member

Cagdas Onal, Committee Chair

Faculty Advisor or Committee Member

Danielle L. Cote, Committee Member

Faculty Advisor or Committee Member

Carl Soderhjelm, Committee Member

Identifier

etd-3031

Abstract

A combination of experimental and computational methods is used to explore the microstructure and mechanical behavior of cold sprayed 6061 aluminum alloy and Ti-6Al-4V alloy and their substrate materials. A variety of microscopic methods are used for characterization of the microstructure. The indentation size effect and characteristic length of strain gradient plasticity for the substrate materials are determined. An FEA simulation describes the behavior of a worn Berkovich nanoindenter. Stress strain is studied experimentally in the substrate materials for future comparison with bulk cold-sprayed materials. Abaqus FEA models are used to simulate a single particle impact for a particle with an oxide layer using a linear Johnson-Cook plasticity model and a bilinear Johnson-Cook plasticity model. The implications of the results are discussed for cold spray processes.

Publisher

Worcester Polytechnic Institute

Degree Name

MS

Department

Mechanical Engineering

Project Type

Thesis

Date Accepted

2019-11-25

Accessibility

Unrestricted

Subjects

Cold Spray, Aluminum, Titanium, Indentation

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