Estudo das propriedades termomecânicas de ligas Cu-Al-Mn com memória de forma

Abstract

Five different compositions of the Cu-Al-Mn shape memory alloys were cast under ambient atmosphere, and characterized thought optical microscopy, X-ray diffraction, and differential scanning calorimetry. Shape recovery and superelasticity was evaluated using mechanical tensile test, always comparing the results between them and observing the influence of manganese concentration on termomecanicals properties. Results were encountered regarding the shape recovery of approximately 5%, however, the compositions of the alloys Cu-Al-Mn analyzed have high brittleness, which should be kept to a minimum. Another favorable aspect in relation to these alloys is highly sensitive to the composition of its components, where 1 %peso increase in manganese content will reduce the Mi temperature around 60 K, which facilitates the handling of their transformation temperatures according to application needs.