Abstract
The characteristics of thermoelastic martensitic transformations occurring in copper based shape memory alloys, are modified when the alloys are treated to contain γ phase precipitates. The precipitates are obtained generally after quenching treatments with or without a subsequent flash heating treatment. The effects of coherency, size and distribution of the γ precipitates on the transformation temperatures and hysteresis are reviewed. The changes produced are related to changes in elastic energy and frictional losses involved during transformation due to presence of precipitates. Results are presented to show that the transformation temperatures and the hysteresis shape remain quite stable under thermal cycling in the presence of coherent precipitates. The two way shape memory effect is induced faster by pseudoelastic cycling in samples with precipitates than in precipitate free samples. Both effects are discussed in terms of the specific microstructural changes produced when precipitate containing samples are transformation cycled.
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