Abstract
Transmission electron microscope (TEM) was used to study small-angle grain boundaries in monoclinic τ 2 -Al 13 Co 4 phase (Pm, a = 3.984 nm, b = 0.8148 nm, c = 3.223 nm and β = 107.97°) as introduced by deformation at high temperatures. According to the character of the dislocations of which the small-angle grain boundaries consist, three types of small-angle grain boundaries have been observed: a zigzag boundary consisting of parallel screw dislocations; a tilt boundary consisting of an edge-dislocation wall; a small-angle grain boundary consisting of a dislocation network.
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