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Hitro strjevanje zlitin Al-Mn-Be in tvorba kvazikristalovZupanič, Franc ...Raziskali smo vpliv parametrov pri hitrem strjevanju s postopkom litja na vrteče kolo (melt spinning) na mikrostrukturo zlitin AlMn5Be4 (M5) in AlMn10Be4 (M10). Glavni cilj je bil ustvariti razmere ... za nastanek enakomerne disperzije kvazikristalnih delcev v aluminijevi osnovi. V začetnem stanju (vakuumskem taljenju in litju) sta bili preiskovani zlitini sestavljeni iz trdne raztopine na osnovi aluminija ▫$\alpha_Al$▫ ter dveh intermetalnih spojin Be4AlMn in Al10Mn3. Ker imata obe zlitini zelo širok temperaturni interval (~300 °C) se je pri premeru odprtine lončka 1,8 mm začelo litje na vrteče kolo (melt spinning), preden je temperatura taline presegla temperaturo likvidus. Posledično je bilo v traku veliko neraztopljenih delcev intermetalnih faz. Zmanjšanje velikosti premera odprtine lončka na 1 mm je omogočilo segretje taline nad temperaturo likvidus pred začetkom litja. Nastala mikrostruktura je bila sestavljena iz osnove ▫$\alpha_Al$▫, v kateri so bili porazdeljeni kvazikristalni delci. Debelino traku smo uravnavali s hitrostjo vrtenja kolesa; večja kot je bila hitrost, tanjši je bil trak. Pri debelejšem traku (debelina okoli 150 ▫$\mu$▫m) je bila mikrostruktura normalno sestavljena iz treh plasti. Tik ob spodnji ploskvi je bilo področje usmerjenega strjevanja z ravno fronto, ki mu je sledila usmerjena celično/dendritna rast. V zgornji plasti so bila enakoosna dendritna zrna. Pri tanjšem traku (40-60 ▫$\mu$▫m) je bila le plast z ravno strjevalno fronto. Kvazikristalni delci so bili v področju rasti s celično in dendritno fronto neenakomerno razporejeni - pretežno v medceličnem oziroma meddendritnem prostoru, medtem ko so bili enakomerno porazdeljeni v osnovi ▫$\alpha_Al$▫ le v področju rasti z ravno fronto.Source: Zbornik referatov 45. livarskega posvetovanja, Portorož, 14.-16. september 2005 = Conference proceedings [of the] 45th Foundry Conference (str. 42-43)Type of material - conference contribution ; adult, seriousPublish date - 2005Language - slovenianCOBISS.SI-ID - 561503
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Zupanič, Franc | 12295 |
Bončina, Tonica | 14334 |
Križman, Alojz | 02780 |
Šuštaršič, Borivoj | 08195 |
Spaić, Savo | 05383 |
Markoli, Boštjan | 16115 |
Source: Personal bibliographies
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