Naslov
AMORPHOUS Al-V THIN FILMS AND THEIR THERMAL STABILITY

Autori
Radić, Nikola ; Dubček, Pavo ; Ristić, Mira ; Siketić, Zdravko ; Ivkov, Jovica ; Skoko, Željko ; Tonejc, Anton

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
JVC14/ EVC12/ AMDVG11/ CroSloVM19 Programme and the Book of Abstracts / Radić, Nikola ; Milošević, Slobodan - Zagreb : Hrvatsko Vakuumsko Društvo (HVD), 2012, 136-136

ISBN
978-953-98154-1-5

Skup
14th Joint Vacuum Conference (JVC 14) and 12th European Vacuum Conference (EVC 12) and 11th Annual Meeting of the German Vacuum Society (AMDVG 11) and 9th Croatian - Slovenian Vacuum Meeting (CROSLOVM 19)

Mjesto i datum
Dubrovnik, Hrvatska, 04.06.2012. - 08.06.2012

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Al-V alloys; amorphous thin films; thermal stability

Sažetak
The Al-V thin film have been prepared in a wide range of composition (Al90V10-Al30V70) by magnetron codeposition. Chemical composition of the alloys has been determined by TOF-ERDA, while the structure of the as-deposited films has been determined by the XRD. The Al-rich (Al90V10 and Al85V15) alloys exhibit (nano)crystalline fcc Al(V) and mixed Al(V) + amorphous phase, respectively. However, the Al80V20 and Al70V30 alloys are fully amorphous – phases not observed in the Al-V rapidly annealed system. By enhancing the vanadium content, the Al60V40 alloy is again mixture of amorphous and Al3V intermetallic phases, and further increase of V content yields mixtures of intermetallic phases with nanostructured V(Al) bcc phase in the V-rich alloys. The transformation of the observed Al-V metastable phases has been monitored by in situ measurement of electric resistance variation during heating up to 800°C in vacuum. In the case of Al-rich alloys a clear irreversible transformation of the supersaturated solid solution into presumably quasicrystalline/intermetallic phases has been observed in the range 300-350°C. Upon further heating, another transformation was observed at about 550-580°C in the case of Al85V15, presumably from quasicrystalline to crystalline intermetallic phase. In the case of fully XRD amorphous Al80V20 and Al70V30 alloys, a first transformation at cca 300-320°C presumably yields quasicrystalline phase which upon further heating yields crystalline or intermetallic phases. The as-deposited samples composed of intermetallic phases do not exhibit an abrupt change of el. resistance up to 800°C, thus being rather stable upon isochronal annealing. Finally, the V-rich alloys Al40V60 and Al30V70 exhibit transformation in the 250-280°C range with a modest increase of electrical resistance, while at about 610°C el. resistivity decreases indicating transformation into more stable phase(s), which nevertheless continues to transform by isothermal annealing at 800°C. The observed transformations involve quasicrystalline/ icosahedral, intermetallic, and nanocrystalline/crystalline as intermediary of final products.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Kemija

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