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Materials 2019, 12(5), 794; https://doi.org/10.3390/ma12050794

Laser-Assisted Synthesis of Cu-Al-Ni Shape Memory Alloys: Effect of Inert Gas Pressure and Ni Content

1
Mechanical and Metallurgical Engineering Department, Escuela de Ingeniería, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860 Macul, 7820436 Santiago, Chile
2
Research Center for Nanotechnology and Advanced Materials (CIEN UC), Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860 Macul, 7820436 Santiago, Chile
3
Departamento de Mecánica, Facultad de Ingeniería, Universidad Tecnológica Metropolitana, José Pedro Alessandri # 1242, Nuñoa, 7800002 Santiago, Chile
*
Author to whom correspondence should be addressed.
Received: 5 January 2019 / Revised: 18 January 2019 / Accepted: 21 January 2019 / Published: 7 March 2019
(This article belongs to the Special Issue Laser Materials Fabrication and Joining)
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Abstract

The paper explores the applicability of laser-assisted synthesis for producing high density Cu-Al-Ni alloys with shape memory characteristics, that could be further developed towards a method of additive manufacturing of large size Cu-based shape memory alloys (SMA). The manufacturing approach consists in laser melting of elemental powder mixture in a controlled atmosphere of varying relative pressure of protective argon gas, producing alloys of 14.2 wt.% Al and Ni content varying between 2 and 4 wt.%. All the fabricated alloys are found to have attained martensitic microstructures capable of SMA specific phase transformations in the temperature range from 85 to 192 °C. Both gas pressure and content of Ni are found to affect the specific transformation temperatures, transformation enthalpies, and mechanical properties. In particular, increasing gas pressure suppresses the austenite to martensite transformation reducing microhardness. In conclusion, the selective laser melting (SLM) employed in this work is shown capable of producing high density Cu-Al-Ni SMA (porosity ≈ 2%). View Full-Text
Keywords: shape memory alloy (SMA); selective laser melting (SLM); Cu-Al-Ni alloy; martensitic transformation shape memory alloy (SMA); selective laser melting (SLM); Cu-Al-Ni alloy; martensitic transformation
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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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Niedbalski, S.; Durán, A.; Walczak, M.; Ramos-Grez, J.A. Laser-Assisted Synthesis of Cu-Al-Ni Shape Memory Alloys: Effect of Inert Gas Pressure and Ni Content. Materials 2019, 12, 794.

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