Internal friction in f. c. c. alloys due to solute drag on dislocation; 2: Experimental studies on Al-Si alloys

Journal Article · Tue Nov 01 04:00:00 EST 1994 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(94)90445-6· OSTI ID:6999715

Pichler, A; Weller, M; Arzt, E ^[1]

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1. Max-Planck-Inst fuer Metallforschung, Stuttgart (Germany) Univ. Stuttgart (Germany). Inst. fuer Metallkunde

Internal friction (mechanical loss) experiments were carried out on single crystal and polycrystalline Al-Si alloys with incoherent Si particles of varying size, spacing, and as a function of pre-strain. The resulting internal friction spectra are correlated with microstructural investigations. The loss maximum at about 450 K (f [approximately] 1 Hz), especially its ''low'' activation enthalpy of H = 1.14 eV, can be explained by the dislocation model described in the companion paper (Part 1), which considers the enhanced transverse diffusivity of solute atoms in the vicinity of the dislocation core. The model is also shown to be in agreement with published data on Al-Si, Al-Mg, Cu-Si and Cu-Al. It is proposed that in many instances the internal friction maxima, even when characterized by a ''low'' activation enthalpy, need not be due to grain boundary or particle effects, but may well be explained by core diffusion effects on solute drag acting on dislocations.

• OSTI ID: 6999715
• Journal Information: Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 42:11; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
360104 -- Metals & Alloys-- Physical Properties
ALLOYS
ALUMINIUM ALLOYS
COPPER ALLOYS
CRYSTAL DEFECTS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
DATA
DISLOCATIONS
EXPERIMENTAL DATA
FCC LATTICES
FRICTION
INFORMATION
INTERNAL FRICTION
LINE DEFECTS
MAGNESIUM ALLOYS
MICROSTRUCTURE
NUMERICAL DATA
SILICON ALLOYS