Structural changes of single crystals of low-alloyed tungsten alloys at thermal cycling

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Show simple item record Skotnicová, Kateřina Kirillova, Valentina M. Drápala, Jaromír Burchanov, Gennadij S. 2012-05-11T11:47:25Z 2012-05-11T11:47:25Z 2012
dc.identifier.citation International journal of refractory metals and hard materials. 2012, vol. 32, p. 61-65. cs
dc.identifier.issn 0263-4368
dc.description.abstract Parameters of sub-structure of single crystals of low-alloyed tungsten alloys from the system W-Nb and W-Mo were investigated after thermal cycling in argon protective atmosphere. The mode of thermal cycling of tungsten based single crystals consisted of heating to the temperature of 2500 °C and of cooling to the temperature of 500 °C with dwell of 3.5 s at those temperature. It was established with use of X-ray topography, OLM and SEM, that after 100 thermocycles dislocations were re-distributed, sub-boundaries of the 2nd order were “washed away” (disappeared), and the size of sub-grains of the 1st order and their angle disorientations increased – as a result of heat stresses. After 500 thermocycles formation of new boundaries was observed in the structure as a result of polygonisation, i.e. by ordering of dislocations of the same sign. Application of 2000 thermocycles led to an increase of size of new grains and that of their angle disorientations. All the tested samples preserved at the thermal cycling within the interval from 0 to 2000 thermocycles their single crystalline structure. Formation of oxides on the surface of single crystals is connected with residual content of oxygen in argon. cs
dc.format.extent 819218 bytes cs
dc.format.mimetype application/pdf cs
dc.language.iso en cs
dc.publisher Elsevier cs
dc.relation.ispartofseries International journal of refractory metals and hard materials cs
dc.relation.uri cs
dc.subject tungsten alloy cs
dc.subject single crystals cs
dc.subject thermal cycling cs
dc.subject electron beam zone melting cs
dc.subject X-ray topography cs
dc.title Structural changes of single crystals of low-alloyed tungsten alloys at thermal cycling cs
dc.type article cs
dc.identifier.location Není ve fondu ÚK cs
dc.identifier.doi 10.1016/j.ijrmhm.2012.02.001
dc.rights.access openAccess
dc.type.version submittedVersion
dc.type.status Peer-reviewed cs
dc.description.source Web of Science cs
dc.description.volume 32 cs
dc.description.lastpage 65 cs
dc.description.firstpage 61 cs
dc.identifier.wos 000302841400011

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