Tensile behaviour of as deposited and heat-treated electroless Ni-P deposits

Panagopoulos, CN; Papachristos, VD; Sigalas, C

dc.contributor.author	Panagopoulos, CN	en
dc.contributor.author	Papachristos, VD	en
dc.contributor.author	Sigalas, C	en
dc.date.accessioned	2014-03-01T01:15:17Z
dc.date.available	2014-03-01T01:15:17Z
dc.date.issued	1999	en
dc.identifier.issn	0022-2461	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/13411
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.subject.other	Carbon steel	en
dc.subject.other	Electroless plating	en
dc.subject.other	Fracture	en
dc.subject.other	Heat treatment	en
dc.subject.other	Inorganic coatings	en
dc.subject.other	Nickel compounds	en
dc.subject.other	Plastic deformation	en
dc.subject.other	Spalling	en
dc.subject.other	Strain	en
dc.subject.other	Tensile strength	en
dc.subject.other	Tensile testing	en
dc.subject.other	Yield stress	en
dc.subject.other	Nickel phosphide	en
dc.subject.other	Amorphous films	en
dc.title	Tensile behaviour of as deposited and heat-treated electroless Ni-P deposits	en
heal.type	journalArticle	en
heal.identifier.primary	10.1023/A:1004600732400	en
heal.identifier.secondary	http://dx.doi.org/10.1023/A:1004600732400	en
heal.language	English	en
heal.publicationDate	1999	en
heal.abstract	Electroless Ni-P coatings were deposited on mild steel substrates and the effect of heat-treatment on their structure and tensile behaviour was studied, with the following conclusions. The as-deposited electroless Ni-P coating is amorphous and it remains amorphous up to 300 degrees C. At 400 degrees C the coating becomes crystalline and consists of a Ni3P matrix containing areas of metallic nickel. For the selected coating/substrate thickness ratio, the contribution of the coating in the tensile properties of the coating-substrate system is negligible as expressed by the values of yield strength, ultimate tensile strength and fracture strain in mild steel substrates and coated as-deposited and heat-treated specimens. Extensive cracking of the coating accompanied by spalling was occurred during the tensile tests. The density of cracks was found to increase close to the fracture surface of the tensile specimen and with increasing heat-treatment temperature. The cracks observed on the surface of the coatings are believed to form due to the inability of the brittle coating to accommodate the strain generated in the ductile substrate. Their orientation to the tensile axis is in close relation to the structure of the coating and the failure mechanism that is dictated by this structure. The first cracks on the surface of the coatings were found to form after the yield strength of the tensile specimen has been reached and plastic deformation of the substrate takes place. Their density increases with the accumulation of strain up to fracture. (C) 1999 Kluwer Academic Publishers.	en
heal.publisher	Kluwer Academic Publishers, Dordrecht, Netherlands	en
heal.journalName	Journal of Materials Science	en
dc.identifier.doi	10.1023/A:1004600732400	en
dc.identifier.isi	ISI:000081181800015	en
dc.identifier.volume	34	en
dc.identifier.issue	11	en
dc.identifier.spage	2587	en
dc.identifier.epage	2600	en