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Mechanical Behaviour of LiF Single Crystals in Compression and Tension at Temperatures from −196°C to 800°C
Author(s) -
Scvortzova N. P.,
Berezhkova G. V.
Publication year - 1986
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.2170210730
Subject(s) - hardening (computing) , materials science , composite material , flow stress , atmospheric temperature range , compression (physics) , shear (geology) , shear stress , plasticity , work hardening , drop (telecommunication) , mechanics , thermodynamics , strain rate , microstructure , physics , telecommunications , computer science , layer (electronics)
The work hardening characteristics of LiF single crystals in compression and tension has been investigated as a function of temperature. It was shown that in temperature range from 200 °C to 600 °C four stages of hardening were observed and the main part of plastic flow proceeds in stage IV. The parabolic hardening was not observed. The flow stresses and hardening rates in all stages in compression are higher than those in tension. As a temperature increase this difference decreases. The hardening rates, stresses which correspond to the beginning of the linear hardening stages and the duration of those stages decrease as a temperature increase. At temperatures above 600 °C the yield drop occured. Taking into account a good agreement between the temperature dependences of the critical resolved shear stress and τIII the assumption was made that τIII corresponds to resolved shear stress in a secondary glide system.