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Dynamic softening mechanism of 30 % SiCp/2024Al composite during hot deformation process
Author(s) -
Wang A.Q.,
Liu S.Y.,
Xie J.P.,
Ma D.Q.
Publication year - 2018
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.201700185
Subject(s) - dynamic recrystallization , materials science , climb , softening , recrystallization (geology) , composite material , isothermal process , hot working , dislocation , slip (aerodynamics) , nucleation , strain rate , atmospheric temperature range , deformation mechanism , metallurgy , microstructure , thermodynamics , physics , paleontology , biology
Using Gleeb‐1500D simulator, the isothermal compression tests of 30 % SiCp/2024Al (volume fraction) are conducted at a temperature range of 623 K ‐ 773 K and a strain rate range of 0.01 s ‐1 ‐ 10 s ‐1 . The softening mechanism of composites during hot deformation has been proposed based on the Zener‐Hollomon parameter Z , deformation temperature T and microstructure analysis. Cross slip of dislocation plays a dominant role under the conditions of ln Z ≥59.634 and T ≤673 K. While, deformation mechanisms such as cross slip, climb of dislocation and unzipping of the three dimensional dislocation network play a joint role when ln Z ≤61.933 and T ≥623 K. Particularly, dynamic recrystallization occurred when ln Z ≤55.669 and T ≥723 K. The cross slip, climb and unzipping of dislocation and dynamic recrystallization are the main softening mechanisms. The role of the dynamic recrystallization mechanisms become more significant and the critical strain of dynamic recrystallization decrease with the decrease of ln Z . Dynamic recrystallization nucleation mechanisms are mainly constituted of the subgrain combination and the bulging of the grain boundary.