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CHARACTERIZING DEFECTS IN STEEL, ALUMINUM AND COPPER BY WAY OF POSITRON ANNIHILATION LIFETIME SPECTROSCOPY

Calloo, Jason Lavaska
http://rave.ohiolink.edu/etdc/view?acc_num=miami1313193894

Abstract Details

2011, Master of Science, Miami University, Physics.
Machines with moving parts develop wear and tear after some time of operation. Sometimes defects are on the surface, and thus are visible with the naked eye or with a microscope. However, some defects are seated below the surface and are unnoticeable by the human eye or by a microscope. One way of probing materials for these defects is by way of Positron Annihilation Lifetime Spectroscopy (PALS). This sensitive technique was applied to characterize atomic-scale defects in aluminum and copper samples, as well as steel bearing raceways of different levels of usage. Measurements on aluminum and copper were performed before and after annealing near the melting point. Results show that average positron lifetime decreases significantly after annealing. Then steel bearing raceways were subjected to PALS measurements before and after mechanical testing. Results show an average increase in the positron lifetime of tested bearings as compared to the as-fabricated bearing.
Herbert Jaeger, Dr (Advisor)
Paul Urayama, Dr (Committee Member)
Michael Pechan, Dr (Committee Member)
59 p.
Physics
Positron; annihilation; gamma ray; detector; steel; aluminum; copper

Recommended Citations

Citations

  • Calloo, J. L. (2011). CHARACTERIZING DEFECTS IN STEEL, ALUMINUM AND COPPER BY WAY OF POSITRON ANNIHILATION LIFETIME SPECTROSCOPY [Master's thesis, Miami University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=miami1313193894

    APA Style (7th edition)

  • Calloo, Jason. CHARACTERIZING DEFECTS IN STEEL, ALUMINUM AND COPPER BY WAY OF POSITRON ANNIHILATION LIFETIME SPECTROSCOPY. 2011. Miami University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=miami1313193894.

    MLA Style (8th edition)

  • Calloo, Jason. "CHARACTERIZING DEFECTS IN STEEL, ALUMINUM AND COPPER BY WAY OF POSITRON ANNIHILATION LIFETIME SPECTROSCOPY." Master's thesis, Miami University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=miami1313193894

    Chicago Manual of Style (17th edition)

miami1313193894
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© 2011, all rights reserved.
This open access ETD is published by Miami University and OhioLINK.