Laser-Assisted Synthesis of Cu-Al-Ni Shape Memory Alloys: Effect of Inert Gas Pressure and Ni Content
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 consi...
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doaj-c102d675e5e74afcabdfc190707166952020-11-24T22:07:53ZengMDPI AGMaterials1996-19442019-03-0112579410.3390/ma12050794ma12050794Laser-Assisted Synthesis of Cu-Al-Ni Shape Memory Alloys: Effect of Inert Gas Pressure and Ni ContentStefan Niedbalski0Alicia Durán1Magdalena Walczak2Jorge A. Ramos-Grez3Mechanical and Metallurgical Engineering Department, Escuela de Ingeniería, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860 Macul, 7820436 Santiago, ChileDepartamento de Mecánica, Facultad de Ingeniería, Universidad Tecnológica Metropolitana, José Pedro Alessandri # 1242, Nuñoa, 7800002 Santiago, ChileMechanical and Metallurgical Engineering Department, Escuela de Ingeniería, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860 Macul, 7820436 Santiago, ChileMechanical and Metallurgical Engineering Department, Escuela de Ingeniería, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860 Macul, 7820436 Santiago, ChileThe 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%).http://www.mdpi.com/1996-1944/12/5/794shape memory alloy (SMA)selective laser melting (SLM)Cu-Al-Ni alloymartensitic transformation |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Stefan Niedbalski Alicia Durán Magdalena Walczak Jorge A. Ramos-Grez |
spellingShingle |
Stefan Niedbalski Alicia Durán Magdalena Walczak Jorge A. Ramos-Grez Laser-Assisted Synthesis of Cu-Al-Ni Shape Memory Alloys: Effect of Inert Gas Pressure and Ni Content Materials shape memory alloy (SMA) selective laser melting (SLM) Cu-Al-Ni alloy martensitic transformation |
author_facet |
Stefan Niedbalski Alicia Durán Magdalena Walczak Jorge A. Ramos-Grez |
author_sort |
Stefan Niedbalski |
title |
Laser-Assisted Synthesis of Cu-Al-Ni Shape Memory Alloys: Effect of Inert Gas Pressure and Ni Content |
title_short |
Laser-Assisted Synthesis of Cu-Al-Ni Shape Memory Alloys: Effect of Inert Gas Pressure and Ni Content |
title_full |
Laser-Assisted Synthesis of Cu-Al-Ni Shape Memory Alloys: Effect of Inert Gas Pressure and Ni Content |
title_fullStr |
Laser-Assisted Synthesis of Cu-Al-Ni Shape Memory Alloys: Effect of Inert Gas Pressure and Ni Content |
title_full_unstemmed |
Laser-Assisted Synthesis of Cu-Al-Ni Shape Memory Alloys: Effect of Inert Gas Pressure and Ni Content |
title_sort |
laser-assisted synthesis of cu-al-ni shape memory alloys: effect of inert gas pressure and ni content |
publisher |
MDPI AG |
series |
Materials |
issn |
1996-1944 |
publishDate |
2019-03-01 |
description |
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%). |
topic |
shape memory alloy (SMA) selective laser melting (SLM) Cu-Al-Ni alloy martensitic transformation |
url |
http://www.mdpi.com/1996-1944/12/5/794 |
work_keys_str_mv |
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