Kniha Characterizing Defects In Metals Using PALS Jason Calloo

Characterizing Defects In Metals Using PALS

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

Autor: Jason Calloo
Jazyk: Angličtina
Väzba: Brožovaná
Dostupnosť: U vydavateľa na objednávku
Odosielame za 17-27 dní
48.52
Machines with moving parts develop wear and tear after some time of operation. Sometimes defects are...

Informácie o knihe

Autor
Jazyk
Angličtina
Väzba
Kniha - Brožovaná
Vydalo
2012
Stránok
68
EAN
9783659253409
Enbook ID
06901566
Hmotnosť
118
Rozmery
150 x 220 x 9

Kompletný popis

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.

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