Title

ANÁLISE DO EFEITO DA TEMPERATURA NO TESTE DE TRAÇÃO A QUENTE NA LIGA DE NiTi

ANALYSIS OF THE EFFECT OF TEMPERATURE ON HOT TENSILE TESTING IN NiTi ALLOY

Authorship

Santos, Luiz Alberto dos; Reis, Danieli Aparecida Pereira; Otubo, Jorge

Santos, Luiz Alberto dos

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Reis, Danieli Aparecida Pereira

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Otubo, Jorge

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DOI

10.5151/1516-392X-30821

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Abstract

. In this work, samples of the alloy with composition of 50.9 % at. Ni were machined and were subjected to hot tensile test, after the machining all the samples were solubilized so that all were in the same condition during the hot tensile test. The hot tensile tests were performed between the temperatures 350-650°C and the yield stress were between 800 and 597.1 MPa and area reduction between 17 and 75% with respect to the initial area. The test at 350°C shows a fragile fracture characteristic while the hot tensile test above this temperature showed a predominantly ductile fracture. The fragile fracture is evidenced by the river marks that are characteristic of this type of fracture, because in this condition does not promote much plastic deformation. The higher temperatures present ductile fracture, because present the dimples that also characterize this type of fracture. This work shows the temperature relationship in the mechanical properties, more specifically the hot tensile test, in the NiTi alloy.

Keywords

Efeito de memória de forma, liga NiTi, Ensaio de Tração a Quente

Shape Memory Alloys, NiTi alloys, Hot Tensile Test