It was proposed that suitable specimens, for the edge-on transmission electron microscopy of twins in B19’ martensite in polycrystalline shape-memory alloys, could be prepared by exploiting the recrystallization texture of cold-drawn rod and the parent/martensite lattice correspondences. Five twinning modes, <011> type-II, {11¯1} type-I, {011} type-I, (100) compound and (001) compound twins, were observed in the martensite. The <011> of the martensite, which was derived from the <001> of the parent phase, was in the edge-on state for all of the observed twinning modes; except (001) compound twinning. The <100> of the martensite which also corresponded to <001> of the parent phase was in the edge-on state for the {011} type-I and (001) compound twinnings. There was a <111> recrystallization fiber texture of the parent phase in the cold-drawn and subsequently annealed rod. Therefore, the identification of twinning modes by the electron diffraction and high-resolution electron microscopy of twin boundaries in the edge-on state was easily carried out by using specimens which were sliced obliquely at about 50 to the drawing direction of the rod.

K.Yamauchi, M.Nishida, K.Kitamura, A.Chiba: Materials Transactions, 1996, 37[3], 210-7