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Verbesserung der Widerstandsfähigkeit gegen Spannungsrisskorrosion und mechanische Eigenschaften einer Al‐Zn‐Mg‐Cu‐Zr Legierung mit heterogener Lamellenstruktur hergestellt durch Hochdruck‐Torsion
Author(s) -
Li P.,
Wu G.S.,
Yan S.L.,
Zhou J.L.,
Xue K.M.,
Shi W.C.
Publication year - 2019
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.201800115
Subject(s) - materials science , torsion (gastropod) , alloy , grain boundary , corrosion , microstructure , metallurgy , stress corrosion cracking , cracking , composite material , environmental stress cracking , medicine , surgery
High pressure torsion experiment followed with heat treatment were carried out on as‐cast Al‐Zn‐Mg‐Cu‐Zr alloy at 400 °C under the pressure of 1 GPa. The microstructure, mechanical property and stress corrosion resistance properties for the as‐cast and high pressure torsion processed samples were studied. The results show that high pressure torsion processing can improve the mechanical property by the refinement of grains and grain boundary precipitates, as well as the homogeneous distribution of fine matrix precipitates. On the other side, the grain refinement, broken of coarse grain boundary precipitates and narrowed precipitates free zone caused by the high pressure torsion result in the improvement of stress corrosion cracking resistance. And due to the influence of heterogeneous lamellae structure, the sample after 0.5 high pressure torsion turn shows preferable mechanical property and stress corrosion cracking resistance than the sample after 2 high pressure torsion turns.