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Mechanisms of anelasticity in Fe–Ge-based alloys

✍ Scribed by I.S. Golovin; H. Neuhäuser; S.A.T. Redfern; H.-R. Sinning


Book ID
104063601
Publisher
Elsevier Science
Year
2009
Tongue
English
Weight
597 KB
Volume
521-522
Category
Article
ISSN
0921-5093

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✦ Synopsis


Internal friction (IF) effects in a series of Fe-Ge-C alloys with 3-27 at.%Ge and about 0.01-0.04 at.%C have been examined and are related to possible mechanisms of anelasticity according to the different alloy structures. While Fe-3 at.%Ge and Fe-12 at.%Ge are bcc and show distinct Snoek-type relaxation, this relaxation is absent in Fe-27 at.%Ge with hexagonal structure. Here a pronounced Zener relaxation at elevated temperatures is observed. The mixed structures (bcc + hexagonal) of Fe-19-21 at.%Ge give rise to a non-thermally activated peak which already appears in Fe-12 at%Ge and may be due to ordering and/or vacancy complexes. In the temperature range below room temperature two neighbouring peaks are detected in the bcc structures which are supposed to be related to dislocations.


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