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Change of the deformation mechanism (slip ⇄ twinning) in polycrystalline α‐iron
Author(s) -
Moiseev V. F.,
Trefilov V. I.
Publication year - 1966
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.19660180241
Subject(s) - crystal twinning , slip (aerodynamics) , materials science , deformation (meteorology) , atmospheric temperature range , condensed matter physics , deformation mechanism , stacking fault , crystallite , stress relaxation , stacking fault energy , stress (linguistics) , composite material , thermodynamics , metallurgy , dislocation , physics , creep , microstructure , linguistics , philosophy
The conditions for the change of the deformation mechanism (slip ⇌ twinning) are investigated in the temperature range from −185 to 20 °C at the deformation rate . It is found that the strength parameters may be expressed by the Petch equation σ = σ 0 + Kd −1/2 for twinning and slip deformation. The temperature dependence of the “frictional” stress and the term K for twinning are studied experimentally. The observed temperature dependence of the slope K is discussed in terms of stress relaxation near stress concentrations. The temperature dependence of the resolved twinning stress is determined by considering the stress concentration necessary for the start of a twinning source. An approximate expression is obtained for estimating the stacking fault energy from the temperature dependence of the yield stress of b.c.c. metals.