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

Result code in 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>

Alternative codes found

RIV/61989100:27360/18:10241450

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

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

Original language description

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.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20501 - Materials engineering

Project

<a href="/en/project/LO1203" target="_blank" >LO1203: Regional Materials Science and Technology Centre - Feasibility Program</a><br>

Continuities

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

Publication year

2018

Confidentiality

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

Article name in the collection

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

Number of pages

6

Pages from-to

1734-1739

Publisher name

Tanger

Place of publication

Ostrava

Event location

Brno

Event date

May 23, 2018

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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