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STUDY OF MICROHARDNESS, CORROSION RESISTANCE AND WEAR PROPERTIES OF SINTERED Ni-Ti ALLOYS
Gabriela Araujo Gois1; Paulo Assis1; Orimar Reis2
1Federal University of Ouro Preto, Ouro Preto, Brazil; 2Instituto Federal de Minas Gerais, Ouro Preto, Brazil

PAPER: 265/Iron/Regular (Oral) OS
SCHEDULED: 14:00/Tue. 22 Oct. 2024/Ariadni C

ABSTRACT:

The Ni-Ti alloy exhibits exceptional properties that enhance its compatibility with the human body, notably its low density, mechanical strength, corrosion and wear resistance, shape memory effect, and superelasticity. The shape memory effect involves a thermal hysteresis due to phase transitions from martensite to austenite when the alloy is cooled and then heated above its transformation threshold, enabling it to revert to its original shape. The superelasticity effect allows the material to return to its original shape after deformation of up to 10% under applied load. In this study, three samples containing 49.5% Ti and 50.5% Ni were produced using the powder metallurgy technique. The chemical composition of these samples was analyzed. The Ni and Ti metal powder mixture was sintered in a controlled atmosphere furnace at 1118°C in the presence of an inert atmosphere with analytical argon 2.0. Following analysis under an optical microscope and scanning electron microscope (SEM), Vickers microhardness, corrosion, and wear tests were conducted to evaluate the alloy's suitability for prosthetics and orthopedic implants.

REFERENCES:
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[2] DEE, Kay C.; PULEO, David A.; BIZIOS, Rena. 2002. An Introduction to Tissue-Biomaterial Interactions: Tissue-Biomaterial. Hoboken, John Wiley & Sons, Inc., 248 p.
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[4] GEROLDO, Augusto Césa de Brito. Estudo do efeito de memória de forma de fios ortodônticos da liga NiTi nas condições comercial e após tratamentos térmicos. 2009. Dissetação de Mestrado em Engenharia e Tecnologia de Materiais. Pontifícia Universidade Católica do Rio Grande do Sul. Porto alegre, 2009. 90p.