Laser melting treatment by overlapping passes of preheated nickel electrodeposited coatings on Al-Si alloy

Houndri, A; Polymenis, S; Chryssoulakis, Y; Pantelis, D

dc.contributor.author	Houndri, A	en
dc.contributor.author	Polymenis, S	en
dc.contributor.author	Chryssoulakis, Y	en
dc.contributor.author	Pantelis, D	en
dc.date.accessioned	2014-03-01T01:08:54Z
dc.date.available	2014-03-01T01:08:54Z
dc.date.issued	1992	en
dc.identifier.issn	0360-2133	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/10728
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.subject.other	Aluminum alloys	en
dc.subject.other	Coatings	en
dc.subject.other	Diffusion in solids	en
dc.subject.other	Electrodeposition	en
dc.subject.other	Hardness	en
dc.subject.other	Laser applications	en
dc.subject.other	Melting	en
dc.subject.other	Microstructure	en
dc.subject.other	Aluminum nickel phases	en
dc.subject.other	Aluminum silicon alloys	en
dc.subject.other	Laser melting treatment	en
dc.subject.other	Microhardness	en
dc.subject.other	Microstructural homogeneity	en
dc.subject.other	Overlapping	en
dc.subject.other	Porosity elimination	en
dc.subject.other	Preheated nickel electrodeposited coatings	en
dc.subject.other	Nickel	en
dc.title	Laser melting treatment by overlapping passes of preheated nickel electrodeposited coatings on Al-Si alloy	en
heal.type	journalArticle	en
heal.identifier.primary	10.1007/BF02804372	en
heal.identifier.secondary	http://dx.doi.org/10.1007/BF02804372	en
heal.language	English	en
heal.publicationDate	1992	en
heal.abstract	Microstructure improvements of a nickel electrodeposited Al-Si alloy were studied after high-power laser melting treatment through a single pass or partially overlapping successive adjacent passes. In some cases, laser melting treatment was preceded by a 5-hour heating of the specimens at 500°C in argon atmosphere furnace. Microstructure observations and microhardness measurements were carried out on the specimens before and after laser melting treatment with and without preheating. Best results concerning microhardness, microstructural homogeneity, and porosity elimination, as well as adhesion of the nickel coating on the Al-Si alloy, were achieved when the specimens were first subjected to heating at 500°C in an argon atmosphere furnace for 5 hours and then submitted to a laser melting treatment through successive adjacent laser passes with an overlapping rate of 70 pct. Microstructure studies were carried out employing X-ray diffraction analysis (XRD) and energy-dispersive spectrometry (EDS). AlNi and Al3Ni phases were detected in the diffusion area which resulted from the 5-hour heating. AlNi, Al3Ni, and Al3Ni2 phases were identified in the laser melted zones (LMZs). Each one of the above phase was found to be the main phase under different conditions. © 1992 The Minerals, Metals & Materials Society and ASM International.	en
heal.publisher	Springer-Verlag	en
heal.journalName	Metallurgical Transactions A	en
dc.identifier.doi	10.1007/BF02804372	en
dc.identifier.isi	ISI:A1992HW87400018	en
dc.identifier.volume	23	en
dc.identifier.issue	6	en
dc.identifier.spage	1801	en
dc.identifier.epage	1806	en