Abstract
Multiple twin boundaries are investigated by HREM for the MgCd ordered alloy. Multiple intersection of twin boundaries exists in the crystal without any relaxation due to lattice dislocations. This intersection is recognized as one of the linear defects, called a disclination. The strain field around a disclination is relaxed by making one or more nearby disclinations opposite in sign. HREM investigation makes it possible not only to determine the types of the disclination but also to confirm crystals not having the lattice dislocations. A tripole-star pattern is found to be a disclination and is constructed in order to compensate for the strain energy of the disclination. Disclinations are likely to distribute to make multipoles in the crystal.
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