Thermally-activated anelastic relaxation in a high-manganese Cu-Mn alloy studied by isothermal low-frequency internal friction

Low-frequency internal friction study has been conducted for a copper-manganese-rich alloy (Cu-60at%, γ Mn). The study used a forced torsion pendulum working in low-frequency scans at constant temperatures, damping experiments ranging between 40Hz and 10−4Hz. The dependence on temperature was extend...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2017-02, Vol.685, p.139-144
Main Authors: Boyer, S.A.E., Gerland, M., Rivière, A.
Format: Article
Language:English
Subjects:
Alloys
Anelasticity
Copper base alloys
Damping
Dislocations
Engineering Sciences
Friction
Internal friction
Isothermal internal friction
Manganese base alloys
Manganese-rich copper-manganese alloy
Materials
Point defects
Zener relaxation
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Summary:Low-frequency internal friction study has been conducted for a copper-manganese-rich alloy (Cu-60at%, γ Mn). The study used a forced torsion pendulum working in low-frequency scans at constant temperatures, damping experiments ranging between 40Hz and 10−4Hz. The dependence on temperature was extended from room temperature to the spinodal curve frontier at 923K. Phenomenological stages in anelastic relaxations of (Cu, γ Mn) were evidenced. Three thermally activated relaxation peaks were assigned respectively to point defects (Zener relaxation), dislocation segments and dislocation walls. [Display omitted] •Thermally-activated Anelastic relaxation in (Cu-60 at.%, γ Mn), spinodal vicinity.•Isothermal Mechanical Spectroscopy (IMS) at low-frequency (40-10-4Hz).•Evidence of Zener point defects, reversible motion of dislocation segments, motion of generated dislocation walls.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2016.12.120