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Influence of Cu₉Al₄ Phase on Nanomechanical Behavior of Cu-14Al-4Ni-xTi Shape Memory Alloy Rapidly Solidified



Author(s)

Marlon Silva¹, Igor Santos¹, Marília Bortolotto¹, Nicole Araújo¹, Pedro Lima¹, Marcelo Nava¹ and Emmanuel Lima²

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DOI:10.17265/2161-6213/2020.5-6.003

1. DATM, Federal Institute of Education, Science and Technology of Bahia—IFBA, Salvador-BA 40301-015, Brazil
2. Faculdade do Gama—FGA, Universityof Brasília—UnB, Gama-DF 72444-240, Brazil

This paper aims to verify the Cu₉Al₄ phase influence on the nanomechanical behavior of the Cu-14Al-4Ni-xTi alloy obtained by rapid solidification with addition of different amounts of Ti. Using the Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), Energy Dispersion Spectroscopy (EDS) and X-Ray Diffraction (XRD), it was possible to perform the samples’ microstructural characterization. In addition, the reduction of the Cu₉Al₄ phase precipitation and the X-phase appearance were verified according to the increase of the titanium percentage added. The nanomechanical behavior was evaluated by nanoindentation tests, which showed a significant decrease of the elastic modules and an increase of the Poisson coefficient’s according to the titanium amount. This research establishes that the reduction of Cu₉Al₄ phase implies on the increase of the capacity to dissipate energy. Therefore, the high damping capacity combined with the X-phase presence increases the super elasticity and the alloy ductility.

Cu-14Al-4Ni-xTi, shape memory effect, microstructure, nanoindentation, superelasticity.