Influence of nano-inclusions' grain boundaries on crack propagation modes in materials

Karakasidis, TE; Charitidis, CA

dc.contributor.author	Karakasidis, TE	en
dc.contributor.author	Charitidis, CA	en
dc.date.accessioned	2014-03-01T01:35:52Z
dc.date.available	2014-03-01T01:35:52Z
dc.date.issued	2011	en
dc.identifier.issn	0921-5107	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/21227
dc.subject	Crack propagation	en
dc.subject	Grain boundaries	en
dc.subject	Nano-inclusions	en
dc.subject	Nanocomposites	en
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.subject.classification	Physics, Condensed Matter	en
dc.subject.other	2-D model	en
dc.subject.other	3D models	en
dc.subject.other	Characteristic size	en
dc.subject.other	Critical value	en
dc.subject.other	Experimental observation	en
dc.subject.other	Fracture mode	en
dc.subject.other	Grain boundary regions	en
dc.subject.other	Grain boundary zone	en
dc.subject.other	Intergranular	en
dc.subject.other	matrix	en
dc.subject.other	Microstructural features	en
dc.subject.other	Nano inclusion	en
dc.subject.other	Strength and toughness	en
dc.subject.other	Transgranular	en
dc.subject.other	Crack propagation	en
dc.subject.other	Cracks	en
dc.subject.other	Crystalline materials	en
dc.subject.other	Crystallite size	en
dc.subject.other	Fracture	en
dc.subject.other	Grain boundaries	en
dc.subject.other	Grain size and shape	en
dc.subject.other	Microstructural evolution	en
dc.subject.other	Nanocomposites	en
dc.subject.other	Stress corrosion cracking	en
dc.subject.other	Textures	en
dc.subject.other	Three dimensional	en
dc.subject.other	Inclusions	en
dc.title	Influence of nano-inclusions' grain boundaries on crack propagation modes in materials	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.mseb.2010.04.013	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.mseb.2010.04.013	en
heal.language	English	en
heal.publicationDate	2011	en
heal.abstract	The effect of nano-inclusions on materials strength and toughness has attracted great interest in recent years. It has been shown that tuning the morphological and microstructural features of materials can tailor their fracture modes. The existence of a characteristic size of inclusions that favours the fracture mode (i.e. transgranular or intergranular) has been experimentally observed but also predicted by a 2D model based on energetic arguments which relates the crack propagation mode to the ratio of the interface area between the crystalline inclusion and the matrix with the area of the crystallite inclusion in a previous work. In the present work, a 3D model is proposed in order to extend the 2D model and take into account the influence of the size of grain boundary zone on the toughening/hardening behavior of the material as it was observed experimentally in the literature. The model relates crack propagation mode to the ratio of the volume of the grain boundary zone between the crystalline inclusion and the matrix with the volume of the nano-inclusion. For a ratio below a critical value, transgranular propagation is favoured while for larger values, intergranular propagation is favoured. We also demonstrate that the extent of the grain boundary region also can significantly affect this critical value. The results of the model are in agreement with the literature experimental observations related to the toughening/hardening behavior as a function of the size of crystalline inclusions as well as the width of the grain boundary regions. (C) 2010 Elsevier B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Materials Science and Engineering B: Solid-State Materials for Advanced Technology	en
dc.identifier.doi	10.1016/j.mseb.2010.04.013	en
dc.identifier.isi	ISI:000289920600007	en
dc.identifier.volume	176	en
dc.identifier.issue	6	en
dc.identifier.spage	490	en
dc.identifier.epage	493	en