Rapid solidification and metastable phase formation during surface modifications of composite Al-Cr cathodes exposed to cathodic arc plasma

Mehran Golizadeh Najafabadi; Francisca Mendez Martin; Stefan Wurster; Johann Mogeritsch; Abdellah Kharicha; Szilárd Kolozsvári; Christian Mitterer; Robert Franz

doi:10.1016/j.jmst.2021.03.059

Rapid solidification and metastable phase formation during surface modifications of composite Al-Cr cathodes exposed to cathodic arc plasma

Mehran Golizadeh Najafabadi
, Francisca Mendez Martin
, Stefan Wurster
, Johann Mogeritsch
, Abdellah Kharicha
, Szilárd Kolozsvári
, Christian Mitterer
, Robert Franz

Erich-Schmid-Institut für Materialwissenschaft der Österreichischen Akademie der Wissenschaften
Plansee Composite Materials GmbH, Lechbruck

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Begutachtung

Abstract

A combination of both conventional and advanced high-resolution characterization techniques was applied to study the modified layers on the surface of three composite Al-Cr arc cathodes with identical nominal composition of Al-50 at.% Cr but varying powder grain sizes. The results revealed that the modified layers consist mainly of metastable phases such as Cr solid solution, high temperature cubic Al ₈Cr ₅, supersaturated Al solid solution, and icosahedral quasicrystal. The metastable phase formation indicates that high cooling rates were involved during the solidification of molten material produced in the arc craters during cathode spot events. The average cooling rate was estimated to be 10 ⁶ K/s based on secondary dendrite arm spacing measurements and supporting phase-field based simulations. The formation mechanisms of the modified layers are discussed based on the obtained results and the current literature.

Originalsprache	Englisch
Seiten (von - bis)	147-163
Seitenumfang	17
Fachzeitschrift	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Jahrgang	94:2021
Ausgabenummer	20 December
Frühes Online-Datum	18 Mai 2021
DOIs	https://doi.org/10.1016/j.jmst.2021.03.059
Publikationsstatus	Veröffentlicht - 20 Dez. 2021

Bibliographische Notiz

Funding Information:
The authors are grateful to Zhuo Chen and Zaoli Zhang (Austrian Academy of Sciences) as well as Boryana Rashkova (Montanuniversität Leoben, Austria) for their support with the TEM investigations. Financial support by the Österreichische Forschungsförderungsgesellschaft mbH (FFG) within the framework of the project “ArcCathodeErosion” (Project No. 856889) is highly acknowledged.

Funding Information:
The authors are grateful to Zhuo Chen and Zaoli Zhang (Austrian Academy of Sciences) as well as Boryana Rashkova (Montanuniversit?t Leoben, Austria) for their support with the TEM investigations. Financial support by the ?sterreichische Forschungsf?rderungsgesellschaft mbH (FFG) within the framework of the project ?ArcCathodeErosion? (Project No. 856889) is highly acknowledged.

Publisher Copyright:
© 2021

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10.1016/j.jmst.2021.03.059

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Golizadeh Najafabadi, M., Mendez Martin, F., Wurster, S., Mogeritsch, J., Kharicha, A., Kolozsvári, S., Mitterer, C., & Franz, R. (2021). Rapid solidification and metastable phase formation during surface modifications of composite Al-Cr cathodes exposed to cathodic arc plasma. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY, 94:2021(20 December), 147-163. https://doi.org/10.1016/j.jmst.2021.03.059

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title = "Rapid solidification and metastable phase formation during surface modifications of composite Al-Cr cathodes exposed to cathodic arc plasma",

abstract = "A combination of both conventional and advanced high-resolution characterization techniques was applied to study the modified layers on the surface of three composite Al-Cr arc cathodes with identical nominal composition of Al-50 at.\% Cr but varying powder grain sizes. The results revealed that the modified layers consist mainly of metastable phases such as Cr solid solution, high temperature cubic Al 8Cr 5, supersaturated Al solid solution, and icosahedral quasicrystal. The metastable phase formation indicates that high cooling rates were involved during the solidification of molten material produced in the arc craters during cathode spot events. The average cooling rate was estimated to be 10 6 K/s based on secondary dendrite arm spacing measurements and supporting phase-field based simulations. The formation mechanisms of the modified layers are discussed based on the obtained results and the current literature. ",

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Golizadeh Najafabadi, M, Mendez Martin, F, Wurster, S, Mogeritsch, J , Kharicha, A, Kolozsvári, S, Mitterer, C & Franz, R 2021, 'Rapid solidification and metastable phase formation during surface modifications of composite Al-Cr cathodes exposed to cathodic arc plasma', JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY, Jg. 94:2021, Nr. 20 December, S. 147-163. https://doi.org/10.1016/j.jmst.2021.03.059

Rapid solidification and metastable phase formation during surface modifications of composite Al-Cr cathodes exposed to cathodic arc plasma. / Golizadeh Najafabadi, Mehran; Mendez Martin, Francisca; Wurster, Stefan et al.
in: JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY, Jahrgang 94:2021, Nr. 20 December, 20.12.2021, S. 147-163.

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Begutachtung

TY - JOUR

T1 - Rapid solidification and metastable phase formation during surface modifications of composite Al-Cr cathodes exposed to cathodic arc plasma

AU - Golizadeh Najafabadi, Mehran

AU - Mendez Martin, Francisca

AU - Wurster, Stefan

AU - Mogeritsch, Johann

AU - Kharicha, Abdellah

AU - Kolozsvári, Szilárd

AU - Mitterer, Christian

AU - Franz, Robert

PY - 2021/12/20

Y1 - 2021/12/20

N2 - A combination of both conventional and advanced high-resolution characterization techniques was applied to study the modified layers on the surface of three composite Al-Cr arc cathodes with identical nominal composition of Al-50 at.% Cr but varying powder grain sizes. The results revealed that the modified layers consist mainly of metastable phases such as Cr solid solution, high temperature cubic Al 8Cr 5, supersaturated Al solid solution, and icosahedral quasicrystal. The metastable phase formation indicates that high cooling rates were involved during the solidification of molten material produced in the arc craters during cathode spot events. The average cooling rate was estimated to be 10 6 K/s based on secondary dendrite arm spacing measurements and supporting phase-field based simulations. The formation mechanisms of the modified layers are discussed based on the obtained results and the current literature.

AB - A combination of both conventional and advanced high-resolution characterization techniques was applied to study the modified layers on the surface of three composite Al-Cr arc cathodes with identical nominal composition of Al-50 at.% Cr but varying powder grain sizes. The results revealed that the modified layers consist mainly of metastable phases such as Cr solid solution, high temperature cubic Al 8Cr 5, supersaturated Al solid solution, and icosahedral quasicrystal. The metastable phase formation indicates that high cooling rates were involved during the solidification of molten material produced in the arc craters during cathode spot events. The average cooling rate was estimated to be 10 6 K/s based on secondary dendrite arm spacing measurements and supporting phase-field based simulations. The formation mechanisms of the modified layers are discussed based on the obtained results and the current literature.

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Golizadeh Najafabadi M, Mendez Martin F, Wurster S, Mogeritsch J , Kharicha A, Kolozsvári S et al. Rapid solidification and metastable phase formation during surface modifications of composite Al-Cr cathodes exposed to cathodic arc plasma. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY. 2021 Dez. 20;94:2021(20 December):147-163. Epub 2021 Mai 18. doi: 10.1016/j.jmst.2021.03.059