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Kokilno litje Al-zlitine Al-Mn-Be-Cu [Elektronski vir]Rozman, Niko ...Na podlagi raziskav zlitine Al-Mn-Be smo razvili zlitino Al-Mn-Be-Cu, ki že ob zmernih ohlajevalnih hitrostih vsebuje metastabilne kvazikristale. V tej raziskavi smo zlitino lili v kokile z različno ... velikostjo in obliko. Ugotavljali smo vpliv oblike forme na mikrostrukturo in posledično tudi trdoto zlitine. Mikrostrukturno analizo smo izvedli z vrstično elektronsko mikroskopijo in opravili EDS analizo faz. Na podlagi pridobljenih rezultatom smo ugotovili naslednje: Ikozaedrična kvazikristalna faza nastane tudi pri zmernih ohlajevalnih hitrostih, to je pri strjevanju v bakreni kokili. Pri litju v ploščato kokilo (1 mm) je v trdni raztopini na osnovi Al navzoča le kvazikristalna faza, ni pa nezaželenih intermetalnih faz med Al in Mn. Te se pojavijo le v središču vzorca, ki je lit v kokilo 4 mm. Kvazikristalna faza je v velikem deležu navzoča še v središču kokile s premerom 6 mm, medtem ko jev 8 mm kokili praktično ni. Poleg kvazikristalne faze so v zlitini še trdna raztopina na osnovi Al ( Al), intermetalni fazi Al2Cu in Al10Mn3. Kvazikristalna faza je lahko v obliki primarnih fasetiranih ali dendritno izoblikovanih delcev, lahko je tudi v okviru binarnega evtektika. Vpliv hitrosti ohlajevanja in temperature pregretja taline na nastanek mikrostrukturnih sestavin je velik, zato je težko dobiti enakomerno porazdelitev in velikost kvazikristalov. Navzočnost kvazikristalov v zlitini in njihova porazdelitev v mikrostrukturi povzroči močno utrditev materiala. Kljub vsemu je potrebno še veliko dela, pred izdelavo zahtevnih tankostenskih ulitkov iz te zlitine. Zato se bomo v nadaljevanju raziskave osredotočili na eksperimentalno merjenje ohlajevalnih krivulj pri litju v omenjene kokile in simulacijo litja.Source: Zbornik referatov [Elektronski vir] = Conference proceedings (12 f.)Type of material - conference contributionPublish date - 2008Language - slovenianCOBISS.SI-ID - 12589846
Author
Rozman, Niko |
Zupanič, Franc |
Petrič, Mitja, 1980- |
Medved, Jože |
Mrvar, Primož
Topics
litje |
Al-zlitine |
kvazikristali |
Slovenija |
kokilno litje
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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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Rozman, Niko | 28409 |
Zupanič, Franc | 12295 |
Petrič, Mitja, 1980- | 28208 |
Medved, Jože | 11625 |
Mrvar, Primož | 18565 |
Source: Personal bibliographies
and: SICRIS
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