Thesis
The corrosion behavior and mechanical properties of AZ31 magnesium alloy
Washington State University
Master of Science (MS), Washington State University
2017
Handle:
https://hdl.handle.net/2376/103156
Abstract
AZ31 magnesium alloy as a biodegradable material has attracted much attentions recently, especially in the field of artificial articulation replacement. However, its fast degradation rate and insufficient mechanical property for load-bearing replacement have largely limited its application. In this study, microstructure, bio-corrosion behavior and mechanical properties of AZ31 magnesium alloys were evaluated. Scanning electron microscope (SEM) was used to observe its morphology changes. Bio-corrosion test was conducted by means of as-received AZ31 magnesium alloy before and after aging treatment, immersing for various time intervals in Simulated Body Fluid. The effect of heat treatment for corrosion behavior and mechanical interties is also investigated. Additionally, compressive tests under intermediate strain rate were carried out on those corroded samples, as well as un-treated AZ31 magnesium alloy as control samples. It was found that corrosion resistance and mechanical property decreased significantly with longer immersion time. Heat treatment is shown to enhance the corrosion resistance, but rather the mechanical property. Samples with 72 h, 200 °C heat treatment behave about 35% higher corrosion resistance, while less than 10% lower in yielding stress comparable to the one whom not. The sample shows reduced but still satisfactory yielding stress after immersion test. Meanwhile, heat treatment can act as a positive factor to the material’s mechanical integrities, especially after longer time period corrosion. These results suggested the yield stress dropped dramatically with increasing immersion time, while it can still satisfy its applications as bone replacements.
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Details
- Title
- The corrosion behavior and mechanical properties of AZ31 magnesium alloy
- Creators
- Wenli Zhao
- Contributors
- Q. Z. Li (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Mechanical and Materials Engineering, School of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900525057201842
- Language
- English
- Resource Type
- Thesis