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Optical micrograph of twin boundaries arrangement showing movable Type II boundary and immovable Type I boundary; (a) initial state—before measurement, (b) final state—after reorientation. The width of micrograph is about 2.5 mm. On the left, the sample is schematically drawn together with the initial positions of the boundaries, magnetization and field orientation. Mobile Type II boundary is marked by small arrows. The sample is 20 mm long and dimensions are proportional.
The magnetization curves of samples exhibiting MIR with two different types of twin boundaries measured at 281 K. The reorientation occurred by Type I boundary (black empty circles) and by Type II boundary (red empty squares). The onset of MIR or switching field, Hsw, is marked in the figure. The sample length was 20 mm for Type II boundary and about 10 mm for Type I boundary. This results in different slope of the return branch of magnetization curve due to demagnetization.
Temperature dependences of switching field, Hsw, for both types of twin boundaries, Type I and II as marked in the figure. Transformation temperature to austenite, TAs, is shown.
Detailed temperature dependence of switching field, Hsw, for Type II twin boundary. Right axis provides estimated equivalent mechanical stress at Hsw equal to the twinning stress.
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