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STRESS INTENSITY FACTOR DEPENDENCE OF HG-AL LIQUID METAL EMBRITTLEMENT
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| Title | STRESS INTENSITY FACTOR DEPENDENCE OF HG-AL LIQUID METAL EMBRITTLEMENT |
| Author | Keller, Scott
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| Keywords | Aluminum
Fracture
Stress Intensity Factor
LME
SCC
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| Abstract | When high strength aluminum alloys are subjected to liquid metals, physical and chemical reactions ensue resulting in what is known as liquid metal embrittlement (LME). A subset of environmentally-assisted cracking, LME is exhibited when a liquid metal, e.g. Hg or Ga, comes into intimate contact with a solid metal having significant susceptibility. As mechanical loads are applied, the interaction between the two metals results in a reduction in the flow properties of the solid metal. Several theories have been proposed to identify the underlying microstructural failure mechanism; however, none have been widely accepted, as failures can typically incorporate features common to several failure theories. In an effort to confirm, extend or replace the physically-based theories, fracture mechanics experiments on Al 7075�T651 in liquid mercury have been conducted. Experiments were conducted in a custom environmental chamber capable of exposing specimens to liquid environments while applying a mechanical load. Through both plane-strain fracture and stress intensity factor-dependent (SIF) tests, fracture toughness values along with incubation periods were analyzed and provided data for a load-based theory of LME. These mechanical test data, along with metallographic analysis, show that the phenomena of LME is both strongly time- and SIF-dependent. |
| Adviser | Gordon, Ali
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| Publisher | University of Central Florida |
| Degree | M.S.M.E.
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| Degree Discipline | Department of Mechanical, Materials and Aerospace Engineering
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| Degree Grantor | Engineering and Computer Science
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| Degree Program | Mechanical Engineering MSME
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| Graduation Date | 2009-01-01 |
| Type | Master's thesis
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| Access Level | Campus - Allow Only UCF Community Access
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| Release Date | 2010-11-01 |
| Repository | University Archives
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| Repository Collection | Electronic Theses and Dissertations
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| Identifier | CFE0002893 |
| Access Link | http://purl.fcla.edu/fcla/etd/CFE0002893 |
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