Ref.: MmeMac09-003

Characterization through SEM of nitinol alloy sintered via laser for application in hypersonic vehicles.

Apresentador: Alana Aíres da Rocha Brito

Autores (Instituição): Brito, A.A.(Instituto Tecnológico de Aeronáutica); Lima, M.S.(Instituto de Estudos Avançados); Costa, F.J.(Instituto Federal de Educação, Ciência e Tecnologia de São Paulo); Costa, G.J.(Instituto Tecnológico de Aeronáutica);

Resumo:
Advances in the propulsion system, aerothermodynamics and flight control project enabled aerospace vehicles vehicles to operate at hypersonic speed, but many problems still existed due to aerodynamic heating and shock wave interactions resulting in high temperatures in the fuselage causing thermal stresses and rapid ablation. Shape memory alloys have become the leading class of smart materials in the aircraft industry. Due to its excellent mechanical properties to withstand high speed and temperature. The use of these materials, mainly in the technological field, provide numerous applications as they present adaptive behavior to adapt to environmental changes. These are materials that have the ability to react an external stimulus in a similar way to biological reactions. Materials with Shape Memory Effect (SME) can recover their original shape even after suffering large deformations, through temperature and/or voltage field in the phase transformation range of the alloy. From a microscopic and macroscopic point of view, the structure remains unchanged when exposed to mechanical loads, and it can be said that it is an elastic phase. Given the synthesis discussed in this summary it is possible to state that the use of shape memory alloys (SMA) in the demonstrator reference technology allows it to be suitable for various light regimes. The objective of this present work is to evaluate the study of the nickel-titanium alloy via selective laser melting for the production of SMA in order to gather post and/or counter arguments within the scope of the microstructure of the manufactured SMA, identifying possible defects , criticizing the influence of process parameters and evaluating the mechanical and metallographic properties of the post-processing material.