GRAIN-BOUNDARY PREMELTING LIKE BEHAVIOR I N 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 99.99 9 mass% silver bicrystal specimens, which have the same grain boundary and different tensile directions, were prepared using a modified Brid gman method. They were deformed in tension to a strain of 0.3. TEM foi ls containing the grain boundary were prepared. They were then subject ed to in-situ heating experiments in a 200 kV TEM. The melting of grai n boundary occurred at lower temperatures in the bicrystals whose boun dary planes are parallel to screw dislocations of the activated slip s ystems than in the bicrystals whose boundary planes are parallel to ed ge dislocations. The grain boundary premelting-like behaviour in silve r bicrystals is similar to that in copper ones.