Rapid synthesis and densification of single-phase Al-Cu-Fe quasicrystals by spark plasma sintering or microwave heating
2010 (English)In: Philosophical Magazine, ISSN 1478-6435, E-ISSN 1478-6443, Vol. 91, no 19-20, 1478-6443 p.Article in journal (Refereed) Published
Quasicrystalline (QC) phases are often stable only within narrow composition domains. For this reason, the synthesis of larger amounts of single-phase quasicrystalline powders is difficult. Powder metallurgical approaches, based on mechanical milling followed by conventional heating, have been explored in the recent past. The manufacturing process for single-phase quasicrystals - either in the form of powders or as bulk parts - can be accelerated by orders of magnitude using rapid heating methods that involve pulsed electric currents and/or high-frequency electromagnetic fields. Prior knowledge of the phase transformation sequence and transformation kinetics, as revealed by in situ time-resolved synchrotron radiation experiments, is crucial in obtaining single-phase quasicrystals. We report on the simultaneous synthesis and densification of bulk single-phase Al-Cu-Fe QCs by spark plasma sintering (SPS) within minutes and on the ultrafast synthesis of single-phase Al-Cu-Fe quasicrystalline powders by microwave heating within seconds. The effect of electric current application in the rapid processing of pre-alloyed powders is discussed in relation to the faster diffusion and enhanced phase transformation kinetics.
Place, publisher, year, edition, pages
2010. Vol. 91, no 19-20, 1478-6443 p.
quasicrystals, spark plasma sintering, microwave heating, synchrotron radiation
IdentifiersURN: urn:nbn:se:su:diva-53048DOI: 10.1080/14786435.2010.511601ISI: 000290670100006OAI: oai:DiVA.org:su-53048DiVA: diva2:389685
authorCount :52011-01-192011-01-192011-12-21Bibliographically approved