Abstract
Orientation dependence of the one-way and two-way shape memory effect (SME) was studied in [001]- and [1̅35] -single crystals of the Co49Ni21Ga30 (at. %) alloy. Two-way SME was obtained by creating internal oriented stress fields due to the training on cooling/heating through martensitic transformation (MT) temperatures under compression stress, σext. It is shown that the value of the one-way SME, εOWSME, and two-way SME, εTWSME, depends on the crystal orientation. In the [001]-oriented crystals εOWSME = 4.2 (± 0.2)%, in [1̅35] -oriented crystals εOWSME = 3.8 (± 0.2)%. In [001]-oriented crystals maximum value of εTWSME equal to 4.3 (± 0.2)% is observed after training under σext = 175 MPa, in [1̅35] -oriented crystals εTWSME = 3.8 (± 0.2)% after training under σext = 250 MPa. The value of εTWSME is equal to the εOWSME and lattice strain ε0 for the corresponding orientation at B2-L10 MT: ε0 [001] = 4.5%, ε0 [1̅35] = 3.8%.
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