Microstructural characterization of PM-Al and PM-Al/Si composites reinforced with lignite fly ash

Moutsatsou, A; Itskos, G; Vounatsos, P; Koukouzas, N; Vasilatos, C

dc.contributor.author	Moutsatsou, A	en
dc.contributor.author	Itskos, G	en
dc.contributor.author	Vounatsos, P	en
dc.contributor.author	Koukouzas, N	en
dc.contributor.author	Vasilatos, C	en
dc.date.accessioned	2014-03-01T01:33:44Z
dc.date.available	2014-03-01T01:33:44Z
dc.date.issued	2010	en
dc.identifier.issn	0921-5093	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/20566
dc.subject	Aluminum-based materials	en
dc.subject	Lignite fly ash	en
dc.subject	MMCs	en
dc.subject	Powder metallurgy	en
dc.subject.classification	Nanoscience & Nanotechnology	en
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.subject.other	Aluminum-based materials	en
dc.subject.other	Aluminum/silicon	en
dc.subject.other	Ash particles	en
dc.subject.other	Chemical compositions	en
dc.subject.other	Fly ash mixtures	en
dc.subject.other	Green products	en
dc.subject.other	Lignite fly ash	en
dc.subject.other	Mass change	en
dc.subject.other	Metal matrices	en
dc.subject.other	Metal matrix composites	en
dc.subject.other	Micro-structural characterization	en
dc.subject.other	Microscopic study	en
dc.subject.other	Mineral phasis	en
dc.subject.other	MMCs	en
dc.subject.other	Post-sintering	en
dc.subject.other	Reinforcement materials	en
dc.subject.other	Sintered compacts	en
dc.subject.other	Sintering process	en
dc.subject.other	Sintering temperatures	en
dc.subject.other	Sintering time	en
dc.subject.other	Thermal behaviors	en
dc.subject.other	Weight percent	en
dc.subject.other	Aluminum	en
dc.subject.other	Aluminum powder metallurgy	en
dc.subject.other	Calcination	en
dc.subject.other	Calcium	en
dc.subject.other	Fly ash	en
dc.subject.other	Lignite	en
dc.subject.other	Metallurgy	en
dc.subject.other	Powder metals	en
dc.subject.other	Silicon	en
dc.subject.other	Silicon alloys	en
dc.subject.other	Sintering	en
dc.subject.other	Metallic matrix composites	en
dc.title	Microstructural characterization of PM-Al and PM-Al/Si composites reinforced with lignite fly ash	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.msea.2010.04.001	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.msea.2010.04.001	en
heal.language	English	en
heal.publicationDate	2010	en
heal.abstract	In the present paper, two Class C, lignite fly ashes (FAs) were utilized for the fabrication of Al/fly ash metal matrix composites (MMCs) using the powder metallurgy (PM) technique. Aluminum-fly ash and aluminum/silicon alloy (Al-12% Si)-fly ash mixtures, containing 5, 10 and 15 wt.% of - both pozzolanic and hydraulic - FAs were prepared and compacted. The green products were tested for their thermal behavior in order for the sintering temperature to be determined. Then, they were sintered for 2 and 6 h. The density of composites was decreasing with the increase of the percentage participation of fly ash particles into them. Apart from that. although FA clusters had been developing in the metal matrix, there was a significant enhancement in the hardness of MMCs when increasing FA content, which is mainly attributed to the intense calcareous nature of the reinforcement material. Volume and mass changes throughout calcination were also estimated as a function of increasing FA weight percent and it seems that CaO (%) of FAs plays a crucial role regarding the post-sintering raise in the mass and volume of composites. Microscopic studies of green and sintered compacts clearly indicated the effectiveness of the sintering process. Additionally, the composites were characterized in terms of their chemical composition and mineralogical structure. The rise of Ca-Si- and Si-mineral phases is intense, particularly for the composites with the highest percentage presence of CaO in FAs (15 wt.%) and does not differentiate as a function of the sintering time. (C) 2010 Elsevier By. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE SA	en
heal.journalName	Materials Science and Engineering A	en
dc.identifier.doi	10.1016/j.msea.2010.04.001	en
dc.identifier.isi	ISI:000279300900037	en
dc.identifier.volume	527	en
dc.identifier.issue	18-19	en
dc.identifier.spage	4788	en
dc.identifier.epage	4795	en