Figure 6

Orientation relationship between the M₂C carbides and the matrix using TEM. (a) Bright-field TEM morphology for a M₂C carbide particle in a PEZ with a size of ~68 nm. (b) SAED patterns for the M₂C carbide particle in (a) and the surrounding matrix, the zone axis is [1 1 1] in the γ matrix and [0 0 0 1] in the M₂C carbide particle. (c) Bright-field TEM morphology for an ~144 nm M₂C carbide particle at the grain boundary. (d) SAED patterns for the M₂C carbide particle in (c) and the surrounding matrix, the zone axes are [1 2 −1] in the γ matrix and [1 1 0 0] in the M₂C carbide particle. In (a,c), the circle possesses the same area as the carbide particle to indicate the size. In (b,d), the yellow arrows and annotations indicate the γ matrix, and the red arrows indicate the M₂C carbides.