Abstract
Two-way memory alloys show a reversible structural transformation which is linked up with transformation heat. At a heating rate of 5 K/min the scatter of the transformation heat of a thermally stable NiTi alloy is smaller than ± 1%. The inhomogeneous predeformation due to torsion results in a reaction interval about 90 K in width. A CuAlMn alloy homogeneously deformed by rolling shows a reaction interval 30 K in width. Reaction temperature and reaction interval can to a certain extent be set on the basis of the composition and the kind and degree of predeformation, so that the production of “tailored” enthalpy standards is conceivable which resemble the effect to be investigated. The production of such standards would, however, demand great sophistication and their use would be subject to certain restrictions.
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