Mechanical spectroscopy of nanocrystalline metals: Structure and anelastic behavior
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.
- Research Organization:
- Univ. de Bologna and Ist. Nazionale per la Fisica della Materia (IT)
- OSTI ID:
- 20000143
- Journal Information:
- Journal of Electronic Materials, Vol. 28, Issue 9; Conference: 1999 TMS Annual Meeting, San Diego, CA (US), 03/02/1999--03/03/1999; Other Information: PBD: Sep 1999; ISSN 0361-5235
- Country of Publication:
- United States
- Language:
- English
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