Efeito da adição de Nb-Ni à liga passiva de efeito de forma Cu-Mn-Al

Abstract

The shape memory alloys consist in a group of metallic materials that have as main characteristic, the ability to undergo large deformations and then recover the original geometry when subjected to certain temperatures or mechanical loading cycles. In order to improve the performance of Cu-based shape memory alloys (SMA), the grains of an alloy composed of Cu-Mn-Al, were refined using Nb-Ni as an inoculant. It was studied the grain size of the microstructure, characterized by optical microscopy. Afterward, the thermomechanical properties were evaluated by tensile testing until rupture. The results were obtained without using a protective atmosphere. Lastly, Nb-Ni, added as an inoculant, was found to have refined the grain, and consequently improved the mechanical properties of the Cu-Mn-Al alloy