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Metastable Al–Si–Ni Alloys for Additive Manufacturing: Structural Stability and Energy Release during Heating

1
Department of Materials Science, Transilvania University of Brasov, 500036 Brasov, Romania
2
Department of Engineering “Enzo Ferrari”, University of Modena and Reggio Emilia, 41100 Modena, Italy
3
Integrated Centre for Environmental Science Studies in the North-East Development Region–CERNESIM, “Al. I. Cuza” University of Iasi, 700506 Iasi, Romania
4
Faculty of Physics, Alexandru Ioan Cuza University, 700506 Iasi, Romania
5
Centre Product Design for Sustainable Development, Transilvania University of Brasov, Eroilor 29, 500036 Brasov, Romania
6
Department of Manufacturing Engineering, Transilvania University of Brasov, 500036 Brasov, Romania
*
Author to whom correspondence should be addressed.
Metals 2019, 9(5), 483; https://doi.org/10.3390/met9050483
Received: 26 March 2019 / Revised: 19 April 2019 / Accepted: 23 April 2019 / Published: 26 April 2019
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Abstract

Rapid solidification with high cooling rates of metal alloys determines both the improvement of mechanical properties, due to the finishing of the structure, as well as obtaining metastable structures in the form of supersaturated or amorphous/nano solid solutions, which could potentially confer the material outstanding properties. It is of particular interest to use the energies released during the heating stage for these materials, due to the potentially lower input energy required to melt/fuse these materials. This phenomenon could add to the development and diversification of additive manufacturing technologies. The paper presents results concerning the structural development and phase transformation of metastable structures from Al–Si–Ni-based alloys, obtained by melt spinning and atomization techniques. It was observed that the structural transformations occurring during the heating process, starting from metastable structures, generate significant amounts of energy. This is of practical importance in the use of metallic powders in additive manufacturing technology, due to potentially reduced energy input. View Full-Text
Keywords: metastable structures; phase transformation; Al-Si-Ni alloys metastable structures; phase transformation; Al-Si-Ni alloys
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Bedo, T.; Varga, B.; Cristea, D.; Nitoi, A.; Gatto, A.; Bassoli, E.; Bulai, G.; Velicu, I.-L.; Ghiuta, I.; Munteanu, S.; Pop, M.A.; Gabor, C.; Cosnita, M.; Parv, L.; Munteanu, D. Metastable Al–Si–Ni Alloys for Additive Manufacturing: Structural Stability and Energy Release during Heating. Metals 2019, 9, 483.

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