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Evolution of the stress-induced martensitic transformation in a CuAlBe shape memory alloy under uniaxial tension, pp. 247-265 $100.00
Authors:  F. M. Sánchez-Arévalo, G. Pulos, R. Pérez-Cabeza de Vaca
Abstract:
The evolution of the stress-induced martensitic transformation was determined for a
Cu-Al 11.2 wt%-Be 0.6 wt% shape memory alloy by digital image analysis. The CuAlBe
tensile specimens were subjected to uniaxial tension; during the tension test, digital images
of the polished and chemically etched surface‘s specimens were taken. From the tension
test, the stress-strain curve representing the macromechanical behavior of the material was
obtained. From the acquired images, the stress-induced martensitic transformation was
observed and the number of grains, the area of the grains and the martensitic plates in the
grains were estimated. Additionally, the orientation of the martensitic plates was
determined for each image associated to the stress-strain curve.
Image analysis showed that, during the tension test, the martensitic variants appeared
and disappeared due to the interaction between a grain and its neighbors, which is caused
by the stress state of the grain, the original variant or variants, and the state of
transformation of the neighboring grains. With the results from the micromechanical
behavior, the strain measured with the strain gage could be resolved into its elastic and
transformational components. 


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Evolution of the stress-induced martensitic transformation in a CuAlBe shape memory alloy under uniaxial tension, pp. 247-265