https://orcid.org/0000-0001-9853-2598
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ABSTRACT
A method to manufacture a porous Cu–Al–Ni shape memory alloy by powder metallurgy using space holders is presented. Two aluminium powders with different particle morphologies were employed to investigate their influence on phase formation, microstructure and mechanical properties. The variation of the relative amount of space holders in the mixture allows to obtain different porosities. Samples prepared with irregular-shaped aluminium powder include both 18R and 2H martensitic phases and exhibit the shape memory effect and pseudoelastic behaviour under uniaxial compression tests. In contrast, the samples made with aluminium flakes present the α phase accompanying the 18R martensitic phase, and do not exhibit the shape memory effect. Both the aluminium flakes flat shape and the higher proportion of aluminium oxide associated with its larger surface area to volume ratio hindered the interdiffusion of the metals, resulting in an aluminium-depleted martensitic phase surrounded by an aluminium oxide-rich layered structure.
Acknowledgements
This work was supported by CONICET under PIP 521/15; and Universidad Nacional de Cuyo under Proyecto bienal 06/C579. The authors thank the New Materials and Devices Group of the Centro Atómico Bariloche for the use of the X-ray microscope.
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No potential conflict of interest was reported by the author(s).
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Notes on contributors
A. P. Gómez
Andrea Gómez received her Master Degree in Engineering from Instituto Balseiro in 2022 and is currently working as a Ph.D. student at the Physics of Metals Division at the Centro Atómico Bariloche. Her research is focused on porous Cu-based shape memory alloys.
G. Urretavizcaya
Guillermina Urretavizcaya is a Senior Researcher at National Council for Science and Technology (CONICET, Argentina) working at Centro Atómico Bariloche, Argentina. She received her Ph.D. degree in Materials Science from Universidad de Mar del Plata in 1995. She is an Associate Professor at Instituto Balseiro, Universidad Nacional de Cuyo in the Area of Materials for Engineering. Her research activities are focused on materials for energetic applications, hydrogen storage in hydrides, alloy recycling for hydrogen production and thermal analysis of materials.
A. L. Baruj
Alberto Baruj is a Senior Researcher at National Council for Science and Technology Research (CONICET, Argentina) and National Atomic Energy Commission (CNEA, Argentina). He received his Ph.D. degree in Physics in 1999 from Instituto Balseiro, where he currently is an Associate Professor in the Area of Materials for Engineering. Former STA Fellow at the Japan National Institute for Materials Science (NIMS) and guest Researcher at the Institute of Materials, Faculty of Engineering, University of Ruhr in Germany. His research fields are phase transformations in shape memory materials and hydride-forming materials, nuclear materials, neutron radiography, electron scanning microscopy and focused ion beams.
M. T. Malachevsky
Maria Teresa Malachevsky is a Senior Researcher at National Atomic Energy Commission (CNEA, Argentina) and National Council for Science and Technology Research (CONICET, Argentina), working at the Centro Atómico Bariloche in Argentina. She received her Ph.D. degree in Physics in 1994 from Instituto Balseiro, where she currently is an Associate Professor in the Area of Materials for Engineering. Her main research activity is focused on the development and tomographic characterisation of different materials prepared by powder metallurgy, including porous shape memory alloys, aluminium foams and MgB2 superconductors.