About: Phase transformations in MgTbNd alloy

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Description	Precipitation in the MgTbNd alloy with similar to 4wt.%Tb and similar to 2wt.%Nd solution treated at 500 degrees C/4h was studied by means of differential scanning calorimetry (DSC) with linear heating rates 1-20K/min. Electrical resistivity measurements at 78K, positron annihilation spectroscopy (PAS), and transmission electron microscopy (TEM) were performed on the specimens isochronally annealed in steps 20K/20min or 30K/30min. Microhardness HV0.1 annealing curves for various isochronal heating programs corresponding to linear heating rates 0.510K/min revealed hardening caused by individual precipitation processes. The precipitation sequence includes successively DO19 clusters, DO19 particles, extremely small particles of the cbco phase, beta 1 phase with fcc structure, beta phase of Mg5(Tb,Nd) type, and beta phase of Mg41(Tb,Nd)5 type. All the particles except the last one have a plate-shape oriented in the Mg matrix in a triangular arrangement. Activation energies of the individual precipitation processes were determined from calorimetric measurements. The results of the PAS and electrical measurements correspond well to the DSC results as well as to the hardening caused by the beta 1 phase particles. Precipitation in the MgTbNd alloy with similar to 4wt.%Tb and similar to 2wt.%Nd solution treated at 500 degrees C/4h was studied by means of differential scanning calorimetry (DSC) with linear heating rates 1-20K/min. Electrical resistivity measurements at 78K, positron annihilation spectroscopy (PAS), and transmission electron microscopy (TEM) were performed on the specimens isochronally annealed in steps 20K/20min or 30K/30min. Microhardness HV0.1 annealing curves for various isochronal heating programs corresponding to linear heating rates 0.510K/min revealed hardening caused by individual precipitation processes. The precipitation sequence includes successively DO19 clusters, DO19 particles, extremely small particles of the cbco phase, beta 1 phase with fcc structure, beta phase of Mg5(Tb,Nd) type, and beta phase of Mg41(Tb,Nd)5 type. All the particles except the last one have a plate-shape oriented in the Mg matrix in a triangular arrangement. Activation energies of the individual precipitation processes were determined from calorimetric measurements. The results of the PAS and electrical measurements correspond well to the DSC results as well as to the hardening caused by the beta 1 phase particles. (en)
Title	Phase transformations in MgTbNd alloy Phase transformations in MgTbNd alloy (en)
skos:prefLabel	Phase transformations in MgTbNd alloy Phase transformations in MgTbNd alloy (en)
skos:notation	RIV/00216208:11320/11:10105870!RIV12-GA0-11320___
http://linked.open...avai/predkladatel	Matematicko-fyzikální fakulta
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(GA106/09/0407), P(GAP108/10/0648), Z(MSM0021620834)
http://linked.open...iv/cisloPeriodika	12
http://linked.open...vai/riv/dodaniDat	2012
http://linked.open...aciTvurceVysledku	Černá, Jaroslava Vlach, Martin Stulíková, Ivana Smola, Bohumil Čížek, Jakub
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	220168
http://linked.open...ai/riv/idVysledku	RIV/00216208:11320/11:10105870
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	TEM.; rare earth alloys and compounds; positron spectroscopy; calorimetry (en)
http://linked.open.../riv/klicoveSlovo	calorimetry TEM. positron spectroscopy rare earth alloys and compounds
http://linked.open...odStatuVydavatele	DE - Spolková republika Německo
http://linked.open...ontrolniKodProRIV	[8545839DBEFE]
http://linked.open...i/riv/nazevZdroje	Physica Status Solidi (A) Applications and Materials
http://linked.open...in/vavai/riv/obor	BM
http://linked.open...ichTvurcuVysledku	5 (xsd:int)
http://linked.open...cetTvurcuVysledku	5 (xsd:int)
http://linked.open...vavai/riv/projekt	Basic investigation of Mg alloys for degradable implants Investigation of defects in icosahedral phases in Mg-alloys
http://linked.open...UplatneniVysledku	2011
http://linked.open...v/svazekPeriodika	208
http://linked.open...iv/tvurceVysledku	Smola, Bohumil Stulíková, Ivana Vlach, Martin Čížek, Jakub Černá, Jaroslava
http://linked.open...ain/vavai/riv/wos	000298240000005
http://linked.open...n/vavai/riv/zamer	Condensed Matter Physics – New Materials and Technologies
issn	1862-6300
number of pages	8 (xsd:int)
http://bibframe.org/vocab/doi	10.1002/pssa.201127296
http://localhost/t...ganizacniJednotka	11320
is http://linked.open...avai/riv/vysledek of	Phase transformations in MgTbNd alloy Phase transformations in MgTbNd alloy

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