About: Thermal and mechanical stability of Mg based nanocomposite studied byinternal friction measurements

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	Magnesium matrix composites show improved wear resistance, enhanced strength and creep resistance in comparison with their monolithic counterparts. On the other hand they keep low density and good machinability. Internal friction measurements are suitable tool to detect changes in the microstructure of thermally or mechanically loaded composites. Samples from pure magnesium reinforced with zirconia nanoparticles were thermally cycled between room temperature and increasing upper temperature of thermal cycle. After thermal cycling amplitude dependence of decrement was measured. Very high values of the logarithmic decrement were ascribed to the poor binding between the matrix and ceramic nanoparticles. The influence of cyclic bending on the damping behaviour of the same nanocomposite was determined at room temperature. Measured decrease of the resonant frequency indicates the stiffness loss as a function of cycling. Observed decrease of amplitude independent component of decrement at the end of the sample life time is due to increase of the dislocation density. These dislocations can be absorbed by the interface. Crack deflection along an interface is followed by the separation of the particle/matrix interface. Magnesium matrix composites show improved wear resistance, enhanced strength and creep resistance in comparison with their monolithic counterparts. On the other hand they keep low density and good machinability. Internal friction measurements are suitable tool to detect changes in the microstructure of thermally or mechanically loaded composites. Samples from pure magnesium reinforced with zirconia nanoparticles were thermally cycled between room temperature and increasing upper temperature of thermal cycle. After thermal cycling amplitude dependence of decrement was measured. Very high values of the logarithmic decrement were ascribed to the poor binding between the matrix and ceramic nanoparticles. The influence of cyclic bending on the damping behaviour of the same nanocomposite was determined at room temperature. Measured decrease of the resonant frequency indicates the stiffness loss as a function of cycling. Observed decrease of amplitude independent component of decrement at the end of the sample life time is due to increase of the dislocation density. These dislocations can be absorbed by the interface. Crack deflection along an interface is followed by the separation of the particle/matrix interface. (en)
Title	Thermal and mechanical stability of Mg based nanocomposite studied byinternal friction measurements Thermal and mechanical stability of Mg based nanocomposite studied byinternal friction measurements (en)
skos:prefLabel	Thermal and mechanical stability of Mg based nanocomposite studied byinternal friction measurements Thermal and mechanical stability of Mg based nanocomposite studied byinternal friction measurements (en)
skos:notation	RIV/00216208:11320/11:10107762!RIV12-AV0-11320___
http://linked.open...avai/predkladatel	Matematicko-fyzikální fakulta
http://linked.open...avai/riv/aktivita	P
http://linked.open...avai/riv/aktivity	P(1M0556), P(IAA201120902)
http://linked.open...iv/cisloPeriodika	3
http://linked.open...vai/riv/dodaniDat	2012
http://linked.open...aciTvurceVysledku	Lukáč, Pavel Trojanová, Zuzanka
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Univerzita Karlova v Praze / Matematicko-fyzikální fakulta
http://linked.open...dnocenehoVysledku	235143
http://linked.open...ai/riv/idVysledku	RIV/00216208:11320/11:10107762
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	internal friction; nanocomposite; Thermal and mechanical stability (en)
http://linked.open.../riv/klicoveSlovo	nanocomposite Thermal and mechanical stability internal friction
http://linked.open...odStatuVydavatele	SK - Slovenská republika
http://linked.open...ontrolniKodProRIV	[41D0578712C8]
http://linked.open...i/riv/nazevZdroje	Kovove Materialy
http://linked.open...in/vavai/riv/obor	BM
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	4 (xsd:int)
http://linked.open...vavai/riv/projekt	Eco-Centre for Applied Research of Non-Ferrous Metals Softening processes during deformation of AZ31 magnesium alloy
http://linked.open...UplatneniVysledku	2011
http://linked.open...v/svazekPeriodika	49
http://linked.open...iv/tvurceVysledku	Lukáč, Pavel Trojanová, Zuzanka Makowska, A. Riehemann, W.
http://linked.open...ain/vavai/riv/wos	000297400400007
issn	0023-432X
number of pages	5 (xsd:int)
http://bibframe.org/vocab/doi	10.4149/km_2011_3_213
http://localhost/t...ganizacniJednotka	11320
is http://linked.open...avai/riv/vysledek of	Thermal and mechanical stability of Mg based nanocomposite studied byinternal friction measurements Thermal and mechanical stability of Mg based nanocomposite studied byinternal friction measurements

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