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Temperature and Strain Rate Dependence of the Flow Stress in Molybdenum
Author(s) -
Guiu F.
Publication year - 1967
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.19670190135
Subject(s) - molybdenum , strain rate , flow stress , atmospheric temperature range , materials science , deformation (meteorology) , stress (linguistics) , strain (injury) , thermodynamics , volume (thermodynamics) , condensed matter physics , crystallography , chemistry , composite material , metallurgy , physics , medicine , linguistics , philosophy
The effect of orientation on the temperature and strain rate ependence of the flow stress of molybdenum single crystals is investigated over the temperature range from 195 to 413°K. The values of the activation parameters Δ H, w , and v are calculated assuming that a single mechanism is rate controlling. It is found that the activation volume at constant stress is a function of the temperature. This together with other results suggest that the deformation is controlled by more than one thermally activated mechanism. An explanation is proposed based on both the overcoming of the Peierls barrier, and the non‐conservative movement of jogs in screw dislocations. The results also indicated that in the range of temperatures from 300 to 350°K there is a change in the rate controlling deformation process.