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Characterizing Defects In Metals Using PALS

Name: Characterizing Defects In Metals Using PALS
Brand: LAP Lambert Academic Publishing
SKU: 06901566
Price: 41.59 EUR
Availability: InStock
Author: Jason Calloo
ISBN: 9783659253409

Characterizing Defects in Steel, Aluminum and Copper by way of Positron Annihilation Lifetime Spectroscopy

Jason Calloo

Lingua

Inglese

Libro In brossura

Codice Libristo: 06901566

Casa editrice LAP Lambert Academic Publishing, novembre 2011

Machines with moving parts develop wear and tear after some time of operation. Sometimes defects are... Descrizione completa

Codice Libristo: 06901566

102 b

41.59 €

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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.