Microstructure and purity of the NiTiZr-based alloys prepared by a plasma metallurgy process

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27230%2F18%3A10241450" target="_blank" >RIV/61989100:27230/18:10241450 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61989100:27360/18:10241450

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Microstructure and purity of the NiTiZr-based alloys prepared by a plasma metallurgy process

Popis výsledku v původním jazyce

Alloys based of the Ni-Ti binary system have important position in a branch of shape memory alloys. Zirconium is an important alloying element giving these alloys needed stability at high-temperature applications. The aims of this paper were a preparation of the Ni-35Ti-15Zr and Ni-45Ti-5Zr (at.%) alloys, description of their microstructures and monitoring of their purity. The alloys were melted by plasma metallurgy processes. Metallographic samples were prepared from a central part of the ingot. The optical and scanning electron microscopes were used for documentation of microstructure. In both cases, the microstructure was polycrystalline with random orientation of grains. Individual grains consisted of dendrites formed by the NiTi-phase. On the contrary, interdendritic space was rich with Zr, eventually it contained undesirable inclusions of TiC and ZrO2. They form in consequences of chosen technology of preparation in combination with high melting temperature. Because titanium is significant picker, contents of oxygen and carbon were monitored in the ingot samples of both alloys. The Ni-45Ti-5Zr alloy contained of 0.115 wt.% O2 and of 0.013 wt.% C. For the Ni-35Ti-15Zr alloy, the content of O2 was 0.103 wt.% and content of C was 0.012 wt. %. Compared to industrially manufactured NiTi-based memory alloys, contents of both elements should not exceed C &lt; 0.07 wt.% and O2 &lt; 0.05 wt.%. We can submit that chosen method of preparation - plasma metallurgy - did not prevent the oxidation of both alloys, even though the melts were in a protective atmosphere of Ar with a purity of 4N6. By contrast, the carbon content remained in the standard. (C) 2018 TANGER Ltd., Ostrava.

Název v anglickém jazyce

Microstructure and purity of the NiTiZr-based alloys prepared by a plasma metallurgy process

Popis výsledku anglicky

Alloys based of the Ni-Ti binary system have important position in a branch of shape memory alloys. Zirconium is an important alloying element giving these alloys needed stability at high-temperature applications. The aims of this paper were a preparation of the Ni-35Ti-15Zr and Ni-45Ti-5Zr (at.%) alloys, description of their microstructures and monitoring of their purity. The alloys were melted by plasma metallurgy processes. Metallographic samples were prepared from a central part of the ingot. The optical and scanning electron microscopes were used for documentation of microstructure. In both cases, the microstructure was polycrystalline with random orientation of grains. Individual grains consisted of dendrites formed by the NiTi-phase. On the contrary, interdendritic space was rich with Zr, eventually it contained undesirable inclusions of TiC and ZrO2. They form in consequences of chosen technology of preparation in combination with high melting temperature. Because titanium is significant picker, contents of oxygen and carbon were monitored in the ingot samples of both alloys. The Ni-45Ti-5Zr alloy contained of 0.115 wt.% O2 and of 0.013 wt.% C. For the Ni-35Ti-15Zr alloy, the content of O2 was 0.103 wt.% and content of C was 0.012 wt. %. Compared to industrially manufactured NiTi-based memory alloys, contents of both elements should not exceed C &lt; 0.07 wt.% and O2 &lt; 0.05 wt.%. We can submit that chosen method of preparation - plasma metallurgy - did not prevent the oxidation of both alloys, even though the melts were in a protective atmosphere of Ar with a purity of 4N6. By contrast, the carbon content remained in the standard. (C) 2018 TANGER Ltd., Ostrava.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20501 - Materials engineering

Projekt

<a href="/cs/project/LO1203" target="_blank" >LO1203: Regionální materiálově technologické výzkumné centrum - Program udržitelnosti</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

METAL 2018 : conference proceedings : reviewed version : 27th International Conference on Metallurgy and Materials : May 23rd-25th 2018, Hotel Voronez I, Brno, Czech Republic, EU

ISBN

978-80-87294-84-0

ISSN

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e-ISSN

neuvedeno

Počet stran výsledku

6

Strana od-do

1734-1739

Název nakladatele

Tanger

Místo vydání

Ostrava

Místo konání akce

Brno

Datum konání akce

23. 5. 2018

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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