X. Molodova, A. Khorashadizadeh, G. Gottstein, M. Winning, R. J. Hellmig
May 23, 2013
Samples of pure Cu and Cu with 0.17 wt.% Zr were processed by equal-channel angular pressing up to 12 passes with a 90° die angle using route B c . Microstructure evolution after deformation and subsequent heat treatment of this severely deformed material was investigated. The deformed and annealed states were characterized by electron back scatter diffraction, transmission electron microscopy, optical microscopy and microhardness tests. The microstructural changes were compared to the behavior of specimens produced by conventional cold rolling. The annealing phenomena were analyzed with regard to recrystallization and grain growth mechanisms. It is shown that the microstructural change during annealing of equal-channel angular pressing deformed specimens has to be associated with discontinuous recrystallization. CuZr samples showed a significantly higher thermal stability against recrystallization than pure Cu samples. This is demonstrated to be primarily due to impurity drag.