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Palmer MS Thesis.pdf (10.84 MB)

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Sensitization Effects on Environmentally Enhanced Cracking of 5XXX Series Alloys: Macro and Mesoscale Observations

Palmer, Benjamin Clive
http://rave.ohiolink.edu/etdc/view?acc_num=case1496232162170832

Abstract Details

2017, Master of Sciences (Engineering), Case Western Reserve University, Materials Science and Engineering.
The focus of this study was on the tensile behavior and damage development in 5083- H131 Al-Mg alloy sensitized to different levels. Samples were tested in the as-received state, after sensitization at 175°C for 100hrs, or 80°C for >500hrs. Tensile testing was conducted under moderate (50%RH) or low (<1%RH) humidity environments to determine the environmental effects on the mechanical behavior of the material. Three different deformation/fracture modes were present depending on the sensitization level and testing environment. Interrupted tensile tests and microscopy revealed that strain was more heterogeneously distributed in the highly sensitized specimens compared to the as-received ones. Differential scanning calorimetry was also performed as a means of determining the degree of sensitization of specimens thermally exposed at temperatures from 60-175°C. This technique was able to detect the presence of Mg-rich phase(s) at thermal exposures as low as 60°C, though it has quantitative limits due to the resolution limit.
John Lewandowski, Dr. (Advisor)
David Schwam, Dr. (Committee Member)
Clare Rimnac, Dr. (Committee Member)
135 p.
Materials Science; Mechanical Engineering
Environment-enhanced-cracking; Stress corrosion cracking; 3-D tomography; Aluminum-magnesium alloys; Differential scanning calorimetry

Recommended Citations

Citations

  • Palmer, B. C. (2017). Sensitization Effects on Environmentally Enhanced Cracking of 5XXX Series Alloys: Macro and Mesoscale Observations [Master's thesis, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case1496232162170832

    APA Style (7th edition)

  • Palmer, Benjamin. Sensitization Effects on Environmentally Enhanced Cracking of 5XXX Series Alloys: Macro and Mesoscale Observations. 2017. Case Western Reserve University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=case1496232162170832.

    MLA Style (8th edition)

  • Palmer, Benjamin. "Sensitization Effects on Environmentally Enhanced Cracking of 5XXX Series Alloys: Macro and Mesoscale Observations." Master's thesis, Case Western Reserve University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=case1496232162170832

    Chicago Manual of Style (17th edition)

case1496232162170832
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© 2017, all rights reserved.
This open access ETD is published by Case Western Reserve University School of Graduate Studies and OhioLINK.