Upward modulus trend in NiAl and NiFeAl single crystals

Citation
E. Bonetti et al., Upward modulus trend in NiAl and NiFeAl single crystals, J ALLOY COM, 310, 2000, pp. 351-355
Citations number
23
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF ALLOYS AND COMPOUNDS
ISSN journal
0925-8388 → ACNP
Volume
310
Year of publication
2000
Pages
351 - 355
Database
ISI
SICI code
0925-8388(20000928)310:<351:UMTINA>2.0.ZU;2-E
Abstract
Dynamic Young modulus, torsion modulus and elastic energy dissipation were measured in Ni(56.2)Fe(0.3)Al(43.1)Ta(0.)3Mo(0.1) (NiAl crystal) and Ni56.6 Fe12.3Al30.2Hf0.6(Al2O3)(0.3) (NiFeAl crystal). The elastic constant C' = ( C-11 - C-12)/2 has in both alloys a positive temperature derivative: (dC'/d T)>0 from 150 K up to 1300 K. The elastic energy dissipation exhibits a Deb ye-like peak whose activation energy is 2.36+/-0.05 eV in NiAl and 1.98+/-0 .09 eV in NiFeAl. The peak is described as a Zener's pair reorientation. (C ) 2000 Elsevier Science S.A. All rights reserved.