Acta Physica Academiae Scientiarum Hungaricae, 1982
Grain boundary motion has been investigated “in situ” in 99,9% purity V sheets in a microscope. T... more Grain boundary motion has been investigated “in situ” in 99,9% purity V sheets in a microscope. The individual grain boundary motion has been followed by the grooves etched thermally on the surface of the sample. The velocity of individual grain boundaries has been measured and compared to the average velocity determined from the normal grain growth law. An analysis of the relation between the velocity of curved boundaries and their curvature is given. The results obtained prove that in the applied experimental circumstances the driving force of the grain boundary motion is the surface energy of the boundaries. Finally, a simple geometrical model is given for explaining the spasmodic migration of the boundaries joined to the surface, as well as the observed sudden breaking of certain grains.
High-temperature behaviour of materials has been investigated by indentation creep methods. Mater... more High-temperature behaviour of materials has been investigated by indentation creep methods. Materials investigated belong to three typical groups of materials: glasses, pure metals and alloys. Indentation tests were performed with flat-ended cylindrical and hemispherical punches. It is shown that the hemispherical punch is also proper for the determination of the high-temperature creep characteristics of the materials investigated. It is also
The aim of this work was to clarify the connection between the deformation mechanism and microstr... more The aim of this work was to clarify the connection between the deformation mechanism and microstructure by the measurement of the apparent activation energy of the superplastic deformation in two different AlZnMg alloys. For comparison a non-superplastic AlMgSi ...
Various types of indentation tests are used to investigate the plasticity of glassy materials. It... more Various types of indentation tests are used to investigate the plasticity of glassy materials. It is shown that indentation creep tests performed with both flat ended cylindrical and hemispherical indenters are suitable for viscosity measurements in the viscosity range of 108–1011Pa·s. It is also shown that the activation energy of the flow process can be evaluated from the results of indentation measurements.
Etude experimentale. Les resultats montrent que le fluage par indentation a lieu dans les alliage... more Etude experimentale. Les resultats montrent que le fluage par indentation a lieu dans les alliages eutectiques Pb Sn. Definition d'un parametre de sensibilite a la vitesse de deformation. Mesure de l'energie d'activation. Le fluage par indentation est un phenomene superplastique
Acta Physica Academiae Scientiarum Hungaricae, 1982
Grain boundary motion has been investigated “in situ” in 99,9% purity V sheets in a microscope. T... more Grain boundary motion has been investigated “in situ” in 99,9% purity V sheets in a microscope. The individual grain boundary motion has been followed by the grooves etched thermally on the surface of the sample. The velocity of individual grain boundaries has been measured and compared to the average velocity determined from the normal grain growth law. An analysis of the relation between the velocity of curved boundaries and their curvature is given. The results obtained prove that in the applied experimental circumstances the driving force of the grain boundary motion is the surface energy of the boundaries. Finally, a simple geometrical model is given for explaining the spasmodic migration of the boundaries joined to the surface, as well as the observed sudden breaking of certain grains.
High-temperature behaviour of materials has been investigated by indentation creep methods. Mater... more High-temperature behaviour of materials has been investigated by indentation creep methods. Materials investigated belong to three typical groups of materials: glasses, pure metals and alloys. Indentation tests were performed with flat-ended cylindrical and hemispherical punches. It is shown that the hemispherical punch is also proper for the determination of the high-temperature creep characteristics of the materials investigated. It is also
The aim of this work was to clarify the connection between the deformation mechanism and microstr... more The aim of this work was to clarify the connection between the deformation mechanism and microstructure by the measurement of the apparent activation energy of the superplastic deformation in two different AlZnMg alloys. For comparison a non-superplastic AlMgSi ...
Various types of indentation tests are used to investigate the plasticity of glassy materials. It... more Various types of indentation tests are used to investigate the plasticity of glassy materials. It is shown that indentation creep tests performed with both flat ended cylindrical and hemispherical indenters are suitable for viscosity measurements in the viscosity range of 108–1011Pa·s. It is also shown that the activation energy of the flow process can be evaluated from the results of indentation measurements.
Etude experimentale. Les resultats montrent que le fluage par indentation a lieu dans les alliage... more Etude experimentale. Les resultats montrent que le fluage par indentation a lieu dans les alliages eutectiques Pb Sn. Definition d'un parametre de sensibilite a la vitesse de deformation. Mesure de l'energie d'activation. Le fluage par indentation est un phenomene superplastique
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