Stress conosion cracking of AL-Zn-Mg alloy single and bicrystals

1975 Keikinzoku/Journal of Japan Institute of Light Metals  
The purpose of this paper was to investigate stress corrosion cracking of A1-4.2%Zn-1.4%Mg-0.32%Mn alloy single and bicrystals. The single and bicrystals investigated were prepared by strain annealing. The results obtained are summarized as follows. 1) In single crystals, stress corrosion cracking occurred in the same way as polycrystals. In stress corrosion cracking tests, the relation between applied stress and time to failure for single crystals was similar to that for polycrystals. 2) In
more » ... gle crystals, stress corrosion cracking occurred along (111) slip plane, i.e. cracks initiated and propagated along the slip band. 3) Stress corrosion cracking in bicrystals did not always occur at the grain boundary. Only in the bicrystals in which the angle between the grain boundary and the tensile axis was 450, stress corrosion cracking occurred at the grain boundary. 4) The resistance to stress corrosion cracking of bicrystals was not affected by the angle between the grain boundary and the tensile axis. It might be caused by the reason that the bicrystals used had small angle grain boundaries.
doi:10.2464/jilm.25.64 fatcat:rakopbt6jjgwtpqmdrspfa6fmu