Banca de QUALIFICAÇÃO: RIVALDO LINS ROCHA FILHO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : RIVALDO LINS ROCHA FILHO
DATA : 22/03/2018
HORA: 16:30
LOCAL: Sala de reuniões do DEMat
TÍTULO:

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

PALAVRAS-CHAVES:

Nitinol, stress induced transformation, LMF, 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 stress-induced transformations or stress 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 the investigations of NiTi alloys in stressed stress induced by asymmetry, phase transformation behaviors in polycrystalline NiTi LMF were very limited. The asymmetric transformation characteristics and related microscopic mechanisms in the polycrystalline NiTi materials are unclear.

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