EFFECT OF GRAIN BOUNDARY ON ACOUSTIC EMISSION DURING PLASTIC DEFORMATION OF COPPER-ALUMINUM BICRYSTALS

摘要

The refined effect of grain boundary (GB) on acoustic emission (AE) is examined during tensile deformation of [110] oriented Cu-Al bicrystals having the Σ9(221) tilt boundary and of single crystals with the same orientation. Some features of AE related to the presence of GB have been found by the detailed AE spectral analysis. AE results are interpreted from the peculiarities of dislocation structure and its behavior near the GB. A kinetic model of pileup movement after crossing the GB satisfactorily explains the appearance of specific AE pulses at the end of Stage II and during Stage III in bicrystals.