Abstract
For the purpose of studing the structure of mosaic boundaries in an alloy, observation of etching pits on the (110) plane of a Ni–Mn single crystal has been made by an electron microscope. The results obtained are summarized as follows: i) Mosaic boundary is composed of a set of parallel edge dislocations which are regularly spaced on a crystal lattice plane, as shown by Burgers, model. ii) These edge dislocations are along crystallographic direction with Burgers vector a /2 , or along direction with Burgers vector a as suggested by Frank. iii) The dislocations are regularly spaced on {110} or {100} plane respectively which are perpendicular to its Burgers vector.
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