The boundary structures of <011> type-II, {111} type-I, {011} type-I, (100) compound and (001) compound twins within the B19' martensite of a shape memory alloy were studied, edge-on, by means of high-resolution electron microscopy. It was found that the lattice images of the type-I and compound twins revealed well-defined crystallographic features in the boundaries. The lattice image of the <011> type-II twin, as seen from the unique 1 axis suggested that neither the ledge structures nor the step structures were present at the irrational boundary.

M.Nishida, K.Yamauchi, I.Itai, H.Ohgi, A.Chiba: Acta Metallurgica et Materialia, 1995, 43[3], 1229-34