Banca de DEFESA: RIVALDO LINS ROCHA FILHO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : RIVALDO LINS ROCHA FILHO
DATA : 17/05/2018
HORA: 09:00
LOCAL: A definir
TÍTULO:

CHARACTERIZATION OF VOLTAGE INDUCED TRANSFORMATION IN THE MICROSTRUCTURE OF A SUPERELASTIC NiTi LEVEL

PALAVRAS-CHAVES:

Nitinol, mechanically induced transformation, microstructural characterization.

PÁGINAS: 59
GRANDE ÁREA: Engenharias
ÁREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Metalurgia de Transformação
RESUMO:

In the present work, the influence of transformations induced by deformation of a superelastic NiTi alloy with approximately equiatomic chemical composition was studied. In a 1 mm diameter Nitinol wire, the phases present in the analyzed material were identified by microstructural characterization techniques, as received and submitted to different radii of curvature. According to the gradual decrease in the radii of curvature an increase in the volume of mechanically induced transformations was observed, as well as a granulometric decrease of the microstructure, being able to be quantified and measured manually and with the aid of software. Microhardness tests were performed in order to verify variations in mechanical properties. In contrast to investigations of NiTi alloys in asymmetric induced stress, phase transformation behaviors in polycrystalline NiTi-form memory alloys were very limited. The asymmetric transformation characteristics and related microscopic mechanisms in polycrystalline NiTi materials have much to be studied.

MEMBROS DA BANCA:
Interno - 2266607 - FABIO JOSE PINHEIRO SOUSA
Externo à Instituição - JORGE MAGNER LOURENÇO - IFRN
Externo ao Programa - 1938946 - NICOLAU APOENA CASTRO
Presidente - 1350249 - RUBENS MARIBONDO DO NASCIMENTO