Burgers vector determination of dislocations in an elastically anisotropic crystal by high-order reflection imaging technique in a HVEM

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Abstract
Dislocations in β-CuZn have been examined by weak-beam imaging and by high-order reflection imaging in a HVEM. It has been shown that under these imaging conditions the conventional invisibility criterion g·b = 0 is valid, even in such an anisotropic crystal as β-CuZn. The Burgers vectors of dislocations in β-CuZn have been determined; they are of three types: ⟨111⟩, ⟨101⟩ and ⟨010⟩. Weak-beam electron microscopy has revealed that the ⟨111⟩ dislocation consists of two 1/2⟨111⟩ superpartials. The ⟨101⟩ and ⟨010⟩ dislocations show directional instability, and this is discussed in terms of anisotropic elasticity theory of dislocations.