Electronic Resource
s.l. ; Stafa-Zurich, Switzerland
Solid state phenomena
Vol. 137 (Mar. 2008), p. 99-108
ISSN:
1662-9779
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Physics
Notes:
Fe3Al intermetallic compounds and several (Fe,Cr)3Al alloys with Cr content from 3 to25 % have been studied using isothermal mechanical spectroscopy. The Zener relaxation caused byreorientation of pairs of substitute atoms in Fe is observed in all studied alloys and used to evaluatethe activation parameters of Al (Cr) atom jumps in Fe. The second internal friction peak at highertemperatures was observed only in Cr containing alloys. Isothermal mechanical spectroscopy(employed frequency from 10-4 to 102 Hz) gives some advantages as compared with ordinarytechniques, i.e. study of anelasticity as a function of temperature. It allows to avoid transient effectsand to measure materials in a state close to equilibrium. This allows to distinguish clearly betweenAl atom diffusion in Fe3Al in B2 and D03 states (activation energies for Fe – 26 Al in the B2 rangethe HB2 ≈ 235 kJ/mol, and in the D03 ordered range the HD03 ≈ 286 kJ/mol). Effect of chromium onthe Zener relaxation is analysed
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.137.99.pdf
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