Abstract
Equiatomic Ni-Ti alloys exhibit shape-memory properties, whereby an article deformed at low temperature regains its original shape at higher temperatures. This effect is due to a reversible martensitic transformation; in binary alloys the parent phase has an ordered cubic (B2) structure which transforms to a monoclinic B19' structure. Substitution of approximately 10% Cu for Ni results in an improvement of shape memory properties which has been attributed to a two-step martensitic transformation from B2 to untwinned B19 and then to twinned B19'. There is, however, some controversy in the literature concerning which phases are in equilibrium and which type of martensite is stable after various thermomechanical treatments. The purpose of this paper is to report on the preliminary findings from an AEM study in order to illuminate the microstructural origins of these controversies.Ti50Ni40Cu10 alloys were cast in a plasma-arc furnace, sectioned and prepared for scanning and transmission electron microscopy.
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Schedule a callMore From: Proceedings, annual meeting, Electron Microscopy Society of America
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