GRAIN-BOUNDARY PREMELTING LIKE BEHAVIOR IN THIN FOILS OF DEFORMED SILVER BICRYSTALS WITH DIFFERENT TENSILE DIRECTIONS

In order to clarify the effect of activated slip systems on the grain boundary premelting-like behaviour in thin foils of two kinds of 99.999 mass% silver bicrystal specimens, which have the same grain boundary and different tensile directions, were prepared using a modified Bridgman method. They were deformed in tension to a strain of 0.3. TEM foils containing the grain boundary were prepared. They were then subjected to in-situ heating experiments in a 200 kV TEM. The melting of grain boundary occurred at lower temperatures in the bicrystals whose boundary planes are parallel to screw dislocations of the activated slip systems than in the bicrystals whose boundary planes are parallel to edge dislocations. The grain boundary premelting-like behaviour in silver bicrystals is similar to that in copper ones.