Title
Low-temperature relaxation in faulted Cu-based martensites Low-temperature relaxation in faulted Cu-based martensites
Author
Faculty/Department
Faculty of Applied Economics
Publication type
article
Publication
Lausanne ,
Subject
Physics
Source (journal)
Materials science and engineering: part A: structural materials: properties, microstructure and processing. - Lausanne
Volume/pages
432(2006) :1-2 , p. 34-39
ISSN
0921-5093
ISI
000240721000005
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
An extensive investigation of elastic and anelastic properties, at an ultrasonic frequency of around 100 kHz, of a variety of binary and ternary Cu-based alloys forming faulted martensites evidences the existence of a strong anelastic relaxation over a wide temperature range propagating down to lowest temperatures achieved in experiments of around 10 K. The anelastic phenomenon observed is the most pronounced for low oscillatory strain amplitudes (approximately from 10(-7) to 10(-6)) and results in a rapid decrease of Young's modulus (measured at low strain amplitudes) with increasing temperatures from the lowest values of around 10 K. The relaxation of Young's modulus is accompanied by a linear increase of the low-amplitude internal friction with increasing temperature. The low-temperature relaxational behaviour is strongly dependent on concentration of quenched-in vacancies: the relaxation is enhanced by P-phase ageing and is strongly suppressed by direct quenching of ternary Cu-Al-Ni, Cu-Zn-Al and Cu-Al-Be alloys. The anelastic effect observed exhibits an unusual property: the amplitude-independent internal friction background emerging as a result of this relaxation is non-additive with the amplitude-dependent internal friction. We suggest that this low-temperature relaxation is associated with a reversible transition from a cooperative to an individual mode of motion of the system of partial dislocations. (c) 2006 Elsevier B.V. All rights reserved.
E-info
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