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Dislocation internal friction and temperature dependence of yield stress in high‐purity molybdenum single crystals
Author(s) -
Lebedev A. B.,
Kardashev B. K.,
Hofmann U.,
Kaufmann H.J.,
Schulze D.
Publication year - 1989
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170241111
Subject(s) - molybdenum , dislocation , amplitude , materials science , atmospheric temperature range , yield (engineering) , internal friction , critical resolved shear stress , shear stress , ultrasonic sensor , deformation (meteorology) , condensed matter physics , composite material , thermodynamics , metallurgy , optics , shear rate , physics , viscosity , acoustics
High purity molybdenum single crystals (residual resistivity ratio ≈ 6 · 10 4 ) were studied by means of computer‐controlled internal friction technique at frequencies of about 100 kHz in the temperature range 6 to 300 K. The amplitude dependences of decrement were measured within the vibrational strain amplitude 10 −7 to 10 −4 . It was established that the temperature dependence of ultrasonic amplitude providing a constant level of reversible dislocation deformation coincides well in relative units with the temperature dependence of the critical resolved shear stress at 20 to 180 K.