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Mechanical Property Evolution of Al-Mg Alloys Following Intermediate Temperature Thermal Exposure

Brosi, Justin Keith
http://rave.ohiolink.edu/etdc/view?acc_num=case1270163761

Abstract Details

2010, Master of Sciences (Engineering), Case Western Reserve University, Materials Science and Engineering.
Experience has shown that 5xxx-series alloys become susceptible to chemical segregation when exposed to temperatures as low as 50°C for long times. In thecurrent study, 5083-H116 and 5456-H116 alloys were exposed to temperatures of 80°C, 100°C, and 175°C for up to 10,000 hours. After exposure, room temperature hardness, tensile, and L-T direction fatigue bend tests were conducted. Reductions in 0.2% yield strength up to 28.8% were observed, with greater reduction as temperature and time increase. Rockwell B hardness decreased up to 20.7% after 100 hours, and then returned to near-as-received levels. Elastic modulus, ultimate tensile stress, and L-T direction fatigue threshold were not measurably affected by thermal exposure. In L-T direction fatigue testing, lateral splitting appeared on the fatigue fracture surfaces, becoming more evident with increasing thermal exposure. Limited fatigue testing in the direction of splitting (S-T direction) suggests that toughness is significantly lower than in the L-T direction.
John Lewandowski, PhD (Committee Chair)
Gary Michal, PhD (Committee Member)
David Schwam, PhD (Committee Member)
314 p.
Engineering; Materials Science; Metallurgy
aluminum alloys; aluminum-magnesium; 5xxx; 5083-H116; 5456-H116; solid solution strengthening; sensitization; mechanical properties; thermal exposure; thermal treatment; materials science; fatigue crack growth; delamination; splitting

Recommended Citations

Citations

  • Brosi, J. K. (2010). Mechanical Property Evolution of Al-Mg Alloys Following Intermediate Temperature Thermal Exposure [Master's thesis, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case1270163761

    APA Style (7th edition)

  • Brosi, Justin. Mechanical Property Evolution of Al-Mg Alloys Following Intermediate Temperature Thermal Exposure. 2010. Case Western Reserve University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=case1270163761.

    MLA Style (8th edition)

  • Brosi, Justin. "Mechanical Property Evolution of Al-Mg Alloys Following Intermediate Temperature Thermal Exposure." Master's thesis, Case Western Reserve University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=case1270163761

    Chicago Manual of Style (17th edition)

case1270163761
462
© 2010, all rights reserved.
This open access ETD is published by Case Western Reserve University School of Graduate Studies and OhioLINK.