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Non-destructive positron-lifetime measurements during fatigue of 
                stainless steel AISI 316L using a mobile positron beam

Record Control Number : 200012132
Quality Validation Date : 2000-07-21
Update Date : 2000-07-21
Title in English: Non-destructive positron-lifetime measurements during fatigue of 
                stainless steel AISI 316L using a mobile positron beam
Author(s) : BARBIERI A;HANSEN-ILLZHÍFER;ILLZHÍFER A;HOLZWARTH U
                European Commission, Joint Research Centre, Institute for Health 
                and Consumer Protection, Ispra (IT) 
Bibliographic Reference : Article: Applied Physics Letters (2000) , further details unknown; 
                Applied Physics Letters (Journal) 
Abstract : Fatigue in metals and other materials poses a great threat in 
                industry while it cannot be detected. A technique to identify the 
                early stages of fatigue is being developed to help industrial 
                workers replace equipment parts before they become dangerous. 
                Positron lifetime measurements are an ideal way to 
                non-destructively test materials put under stress and fatigue. A 
                stream of positrons from a Selenium/Arsenic generator is bombarded 
                against a sample of stainless steel kept under stress to induce 
                fatigue. Positron decay is measured using spectroscopy. Positrons 
                will decay rapidly when in contact with electrons which in a fully 
                sound material results in rapid disintegration of the positron 
                stream. A material with a defect or hole will have a gap in the 
                electron structure allowing positrons to congregate. These defects 
                are seen on the spectrometer as longer living positrons that are 
                protected from electron activity. This technique will replace 
                earlier defect detection methods that only operated on a 
                microscopic scale and were often material dependent. The positron 
                lifetime measurements will be adaptable to all materials and will 
                detect a defect as soon as it starts to occur.
Facet Codes : Materials testing and derived properties, Metals and alloys
Availability in Languages : en
Publication Year : 2000
Publication Type : An article in a journal








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