One of the important factor which controls the MSM effect is the magneto-crystalline anisotropy of the martensite with the c/a<1.  A crystallographic texture of the polycrystalline alloy can significantly improve this effect. The preferred orientation is the <001> direction which is the easy magnetization direction.

The studies were carried out on two Ni-Mn-Ga polycrystalline alloys with the 10M martensite structure. The specimens were cut along the [001] and [110] directions of the columnar grains  from the ingots of either round or flat shape. The rolling was carried out on the samples imbedded in steel channel bar and “sealed” in a flat pipe. The samples were heated up to 1000⁰C and rolled in one direction in several steps. Before each step the sample was reheated. The final reduction of the samples thickness was: 28%, 36%, 57% and 69%.

The texture was studied by the EBSD and X-ray diffraction using the {001}, {110} and {111} pole figures.

The texture of the initial [001] orientation rolled with the highest deformation 60% shows the following orientation components: {111}<011>, {111}<112>, {112}<011>  which are typical for deformed and recrystallized metals of the A2 structure. The presence of the {011}<100> components was not stated. The texture of the specimen with the initial [110] orientation rolled with  69% can be described as a fibre texture scattered along the <110> direction. This kind of texture for the rolled samples of the A2 structure is also known in the praxis. As a conclusion one can state that the hot rolling of the Ni-Mn-Ga alloys is not efficient to produce the texture with [001] orientation.

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