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Influence of Heat Treatment on Microstructure and Properties of NiTi46 Alloy Consolidated by Spark Plasma Sintering

Ni-Ti alloys are considered to be very important shape memory alloys with a wide application area including, e.g., biomaterials, actuators, couplings, and components in automotive, aerospace, and robotics industries. In this study, the NiTi46 (wt.%) alloy was prepared by a combination of self-propag...

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Autores principales: Salvetr, Pavel, Dlouhý, Jaromír, Školáková, Andrea, Průša, Filip, Novák, Pavel, Karlík, Miroslav, Haušild, Petr
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6947301/
https://www.ncbi.nlm.nih.gov/pubmed/31817662
http://dx.doi.org/10.3390/ma12244075
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author Salvetr, Pavel
Dlouhý, Jaromír
Školáková, Andrea
Průša, Filip
Novák, Pavel
Karlík, Miroslav
Haušild, Petr
author_facet Salvetr, Pavel
Dlouhý, Jaromír
Školáková, Andrea
Průša, Filip
Novák, Pavel
Karlík, Miroslav
Haušild, Petr
author_sort Salvetr, Pavel
collection PubMed
description Ni-Ti alloys are considered to be very important shape memory alloys with a wide application area including, e.g., biomaterials, actuators, couplings, and components in automotive, aerospace, and robotics industries. In this study, the NiTi46 (wt.%) alloy was prepared by a combination of self-propagating high-temperature synthesis, milling, and spark plasma sintering consolidation at three various temperatures. The compacted samples were subsequently heat-treated at temperatures between 400 °C and 900 °C with the following quenching in water or slow cooling in a closed furnace. The influence of the consolidation temperature and regime of heat treatment on the microstructure, mechanical properties, and temperatures of phase transformation was evaluated. The results demonstrate the brittle behaviour of the samples directly after spark plasma sintering at all temperatures by the compressive test and no transformation temperatures at differential scanning calorimetry curves. The biggest improvement of mechanical properties, which was mainly a ductility enhancement, was achieved by heat treatment at 700 °C. Slow cooling has to be recommended in order to obtain the shape memory properties.
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spelling pubmed-69473012020-01-13 Influence of Heat Treatment on Microstructure and Properties of NiTi46 Alloy Consolidated by Spark Plasma Sintering Salvetr, Pavel Dlouhý, Jaromír Školáková, Andrea Průša, Filip Novák, Pavel Karlík, Miroslav Haušild, Petr Materials (Basel) Article Ni-Ti alloys are considered to be very important shape memory alloys with a wide application area including, e.g., biomaterials, actuators, couplings, and components in automotive, aerospace, and robotics industries. In this study, the NiTi46 (wt.%) alloy was prepared by a combination of self-propagating high-temperature synthesis, milling, and spark plasma sintering consolidation at three various temperatures. The compacted samples were subsequently heat-treated at temperatures between 400 °C and 900 °C with the following quenching in water or slow cooling in a closed furnace. The influence of the consolidation temperature and regime of heat treatment on the microstructure, mechanical properties, and temperatures of phase transformation was evaluated. The results demonstrate the brittle behaviour of the samples directly after spark plasma sintering at all temperatures by the compressive test and no transformation temperatures at differential scanning calorimetry curves. The biggest improvement of mechanical properties, which was mainly a ductility enhancement, was achieved by heat treatment at 700 °C. Slow cooling has to be recommended in order to obtain the shape memory properties. MDPI 2019-12-06 /pmc/articles/PMC6947301/ /pubmed/31817662 http://dx.doi.org/10.3390/ma12244075 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Salvetr, Pavel
Dlouhý, Jaromír
Školáková, Andrea
Průša, Filip
Novák, Pavel
Karlík, Miroslav
Haušild, Petr
Influence of Heat Treatment on Microstructure and Properties of NiTi46 Alloy Consolidated by Spark Plasma Sintering
title Influence of Heat Treatment on Microstructure and Properties of NiTi46 Alloy Consolidated by Spark Plasma Sintering
title_full Influence of Heat Treatment on Microstructure and Properties of NiTi46 Alloy Consolidated by Spark Plasma Sintering
title_fullStr Influence of Heat Treatment on Microstructure and Properties of NiTi46 Alloy Consolidated by Spark Plasma Sintering
title_full_unstemmed Influence of Heat Treatment on Microstructure and Properties of NiTi46 Alloy Consolidated by Spark Plasma Sintering
title_short Influence of Heat Treatment on Microstructure and Properties of NiTi46 Alloy Consolidated by Spark Plasma Sintering
title_sort influence of heat treatment on microstructure and properties of niti46 alloy consolidated by spark plasma sintering
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6947301/
https://www.ncbi.nlm.nih.gov/pubmed/31817662
http://dx.doi.org/10.3390/ma12244075
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