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Title: Mechanical spectroscopy of nanocrystalline metals: Structure and anelastic behavior

Abstract

Nanocrystalline aluminum and nickel were prepared by mechanical attrition in a planetary ball-milling apparatus working under a 10{sup {minus}4} Pa vacuum in the 150--300 K range. A detailed investigation of the mechanical behavior in the anelastic regime was accomplished by employing different mechanical spectroscopy apparatuses in the 0.01--10{sup 3} Hz range. Measurements of the elastic energy dissipation coefficient and of the dynamic elasticity modulus as a function of temperature and frequency have shown an enhanced damping at low temperatures and an anelastic relaxation peak tentatively assigned to the short range dynamics at the interfaces. Moreover the magnetic field dependence of the dynamic elastic modulus in nickel revealed a strict correlation between the microstrains confined at the interfaces and the magnitude of the magnetoelastic coupling.

Authors:
;
Publication Date:
Research Org.:
Univ. de Bologna and Ist. Nazionale per la Fisica della Materia (IT)
OSTI Identifier:
20000143
Alternate Identifier(s):
OSTI ID: 20000143
Resource Type:
Journal Article
Journal Name:
Journal of Electronic Materials
Additional Journal Information:
Journal Volume: 28; Journal Issue: 9; Conference: 1999 TMS Annual Meeting, San Diego, CA (US), 03/02/1999--03/03/1999; Other Information: PBD: Sep 1999; Journal ID: ISSN 0361-5235
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; MICROSTRUCTURE; ELASTICITY; ALUMINIUM; NICKEL; MILLING; TEMPERATURE DEPENDENCE; INTERFACES; ENERGY LOSSES; INTERNAL FRICTION

Citation Formats

Bonetti, E., and Pasquini, L. Mechanical spectroscopy of nanocrystalline metals: Structure and anelastic behavior. United States: N. p., 1999. Web. doi:10.1007/s11664-999-0183-y.
Bonetti, E., & Pasquini, L. Mechanical spectroscopy of nanocrystalline metals: Structure and anelastic behavior. United States. doi:10.1007/s11664-999-0183-y.
Bonetti, E., and Pasquini, L. Wed . "Mechanical spectroscopy of nanocrystalline metals: Structure and anelastic behavior". United States. doi:10.1007/s11664-999-0183-y.
@article{osti_20000143,
title = {Mechanical spectroscopy of nanocrystalline metals: Structure and anelastic behavior},
author = {Bonetti, E. and Pasquini, L.},
abstractNote = {Nanocrystalline aluminum and nickel were prepared by mechanical attrition in a planetary ball-milling apparatus working under a 10{sup {minus}4} Pa vacuum in the 150--300 K range. A detailed investigation of the mechanical behavior in the anelastic regime was accomplished by employing different mechanical spectroscopy apparatuses in the 0.01--10{sup 3} Hz range. Measurements of the elastic energy dissipation coefficient and of the dynamic elasticity modulus as a function of temperature and frequency have shown an enhanced damping at low temperatures and an anelastic relaxation peak tentatively assigned to the short range dynamics at the interfaces. Moreover the magnetic field dependence of the dynamic elastic modulus in nickel revealed a strict correlation between the microstrains confined at the interfaces and the magnitude of the magnetoelastic coupling.},
doi = {10.1007/s11664-999-0183-y},
journal = {Journal of Electronic Materials},
issn = {0361-5235},
number = 9,
volume = 28,
place = {United States},
year = {1999},
month = {9}
}