The Effects of Laser Shock Peening on the Residual Stress and Corrosion Characteristics of Magnesium Alloy AZ91D for use as Biodegradable Implants

There is a continuing interest in exploring magnesium and its alloys for biomedical applications due to its low density and high strength properties that are very similar to bone. However, the high corrosion rate of magnesium and its alloys while immersed in body fluid restrict the material from use as permanent implants. The ability to control the corrosion rate of a material is an important factor in the development of biodegradable implants. An emerging topic of study for controlling the corrosion rates of different material is through imparting high levels of compressive residual stress on the surface. One effective process of imparting high levels of compressive residual stress on a material is Laser Shock Peening (LSP). Laser Shock Peening is a material process in which a high-pulsed laser creates a pressure shock wave that travels through the depth of the material, leaving high levels of compressive residual stress through its depth.This thesis will present a study on the effects of compressive residual stresses imparted through laser shock peening on the corrosion characteristics of magnesium alloy AZ91D. In order to understand all aspects of this, an in-depth material characterization of the alloy is performed. Next, an LSP study is performed in which the optimal LSP parameters are determined. The experimental results are validated using Finite Element Analysis in LS-DYNA. Once LSP parameters have been optimized, corrosion tests are performed to link the relationship between compressive residual stress and corrosion rates of AZ91D.

Name thesis:degree_name

MS

Level thesis:degree_level

masters

Discipline thesis:degree_discipline

Engineering and Applied Science: Mechanical Engineering

Grantor dc:publisher

University of Cincinnati

Year dc:date

2012

Author dc:creator

• Russo, James

Contributors dc:contributor

• Qian, Dong

• Mechanical Engineering
• Magnesium
• AZ91
• johnson cook
• LSP
• Laser Shock Peening
• peening

Statement dc:rights

• unrestricted
• This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.

Language dc:language

English

Repository record dc:identifier

http://rave.ohiolink.edu/etdc/view?acc_num=ucin1354550566

OAI identifier oai:identifier

oai:etd.ohiolink.edu:ucin1354550566