Theses and Dissertations

Issuing Body

Mississippi State University

Advisor

Rhee, Hongjoo

Committee Member

El Kadiri, Haitham

Committee Member

Paudel, Yub Raj

Committee Member

Hammi, Youssef

Date of Degree

4-30-2021

Original embargo terms

Complete embargo for 6 months

Document Type

Dissertation - Open Access

Major

Mechanical Engineering

Degree Name

Doctor of Philosophy

College

James Worth Bagley College of Engineering

Department

Department of Mechanical Engineering

Abstract

Parsing the effect of slip-twin interactions on the strain rate and thermal sensitivities of Magnesium (Mg) alloys has been a challenging endeavor for scientists preoccupied with the mechanical behavior of hexagonal close-packed alloys, especially those with great latent economic potential such as Mg. One of the main barriers is the travail entailed in fitting the various stress-strain behaviors at different temperatures, strain rates, loading directions applied to different starting textures. Taking on this task for two different Mg alloys presenting different textures and as such various levels of slip-twin interactions were modeled using VPSC code. A recently developed routine that captures dislocation transmutation by twinning interfaces on strain hardening within the twin lamellae was employed. While the strong texture was exemplified by traditional rolled AZ31 Mg alloys, the weak texture was represented by ZEK100 Mg alloy sheets. The transmutation model casted within a dislocation density based hardening model showed tremendous flexibility in predicting the complex strain rate and thermal sensitive behavior of Mg textures’ response to various mechanical loadings schemes.

Sponsorship

360647 ARL-03

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