Abstract
The effect of the internal stress on the two-way shape memory in Co49Ni21.6Ga29.4 single crystals has been investigated. We found that the internal stress generated natively by the solidifying process works as a tensile force along the growth direction. Applying different compressive pre-stresses along the [0 0 1] direction, the shape-memory strain can be continuously changed from +1.0% to −2.3%. In the [1 1 0] direction, the strain monotonically increases from −2.0% to −4.0% due to a strong detwinning produced by the consistent effect of the external and internal stresses.
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