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Work Hardening and Thermally Activated Flow in Magnesium Single Crystals
Author(s) -
Sharp J. V.,
Christian J. W.
Publication year - 1965
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19650110234
Subject(s) - materials science , work hardening , strain rate , magnesium , atmospheric temperature range , thermodynamics , hardening (computing) , activation energy , flow stress , shear (geology) , strain hardening exponent , shear stress , critical resolved shear stress , composite material , metallurgy , shear rate , chemistry , physics , microstructure , layer (electronics) , viscosity
Shear stress vs. shear strain curves have been obtained from magnesium single crystals orientated for basal glide and tested in tension over the temperature range 77 to 413 °K. Incremental changes of strain rate and temperature were also made and the results used to deduce the usual parameters of thermally activated flow. A two‐stage hardening curve was found, the work‐hardening rate being 150 to 400 g/mm 2 in stage I at room temperature, and 3 to 5 kg/mm 2 in stage II. The Cottrell‐Stokes law was found to be obeyed for strain rate changes at low temperatures, but at higher temperatures the behaviour was more complex. The activation energy for stage I deformation increased to a roughly constant value of 0.3 to 0.4 eV at high temperatures.