A new mechanism for 1/2<110> and 1/2<112> dislocation pinning in TiAl is discussed. This mechanism is based on the inability of 1/2<110> perfect dislocations and 1/2<112> superdislocations to propagate through small γ order-domains where the two γ-grains are related by an order relationship equivalent to a 120° rotation about <111>.
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