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Besterci, Michal; Kohútek, I.; Sülleiová, Katarína; Saxl, Ivan

doi:10.1023/a:1004552213455

Cited by 10 publications

(8 citation statements)

References 5 publications

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“…The TEM micrographs (Figure 2) showed that the mean grain size decreased from starting value of about 0.6 m to final value of 100-200 nm [9]. The results of extensive microstructural characterization of the material under investigation can be found in previous articles [11,12]. The disc specimens for SP testing were prepared by cutting slices 1.2 mm thick and 8 mm in diameter using spark erosion.…”

Section: Methodsmentioning

confidence: 99%

Observation of Anisotropy of Creep Fracture Using Small Punch Test for Al-Al4C3 System Produced by Equal Channel Angular Pressing

Besterci¹,

Dobeš²,

Ballóková³

et al. 2011

High Temperature Materials and Processes

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The anisotropy of the creep properties and fracture using small punch tests for the Al-Al 4 C 3 system produced by ECAP were analysed in this work. Small punch creep tests under constant force were performed at the temperature of 623 K. It was shown that the fracture results, i.e. time to fracture and deflection at fracture were different in specimens with different orientation with respect to the axis of ECAP deformation. Fracture surface analysis of the tested small punch specimens was conducted. Fractures have transcrystalline ductile character. The fracture dimples are equiaxial as well as elongated in the dependence on strain direction. Fracture dimples are of two categories, the small ones sized from 0.1 to 0.5 m and large ones ranging from 3 to 6 m.

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Section: Methodsmentioning

confidence: 99%

Observation of Anisotropy of Creep Fracture Using Small Punch Test for Al-Al4C3 System Produced by Equal Channel Angular Pressing

Besterci¹,

Dobeš²,

Ballóková³

et al. 2011

High Temperature Materials and Processes

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“…In our previous works [11][12][13], we have evaluated the distance between the particles by point object simulation methods. This includes the mean interparticle distance λ µ , the mean minimum DOI distance λ ρ , the mean visibility λ ν , and the mean free spherical contact distance λ ϑ .…”

Section: Mechanical Properties Of Microstructural Systemmentioning

confidence: 99%

HIGH TEMPERATURE MECHANICAL PROPERTIES OF Al-Al4C3 COMPOSITE PRODUCED BY MECHANICAL ALLOYING

Besterci¹,

Dobeš²,

Kvačkaj³

et al. 2014

Acta Metall Slovaca

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A method of mechanical alloying process is described. It was proved that the transformation efficiency of carbon to Al 4 C 3 by heat treatment of aluminium with the porous furnace black and electrographite at temperatures 723-873 K and time periods 1-10 hours is higher than that of the hard cracked graphite. The size of Al 4 C 3 dispersed phase was measured on thin foil and it was constant and as small as 30 nm. Subgrain size measured in the range of 100 grains in thin foils depended on the carbon type.. It ranged from 0.3 to 0.7 μm. Mechanical properties were analyzed in a microstructural matrix (after extrusion) as well as in nano-matrix The temperature dependence of ductility, and reduction of area in the temperature range of 623-723 K and strain rate of 10-1 s-1 , indicated a considerable increase of properties. In a case when the volume fraction of Al 4 C 3 changes from lower to higher, the grain rotation mechanism dominates instead of the grain boundary sliding. Creep parameters for Al-Al 4 C 3 systems and commercial IN9021 and IN9052 systems were compared. The dependence of the minimum deflection rate on the applied force as well as the dependence of the time to fracture on the applied force for two temperature levels (623 and 723 K) by small punch testing is depicted. The anisotropy of the creep properties and fracture using small punch tests for the Al-Al 4 C 3 system produced by ECAP were analyzed.

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“…In our previous works [9][10][11], we have evaluated the distance between the particles by point object simulation methods. This includes the mean interparticle distance l m , the mean minimum distance l r , the mean visibility l n , and the mean free spherical contact distance l J .…”

Section: Mechanical Properties Of Microstructural Systemmentioning

confidence: 99%

“…During the last years, a new approach to the descrip tion of point systems has been developed intensively, which is referred to as polygonal methods [11]. The dual representation formed in the above way describes com pletely the given point system.…”

Section: Mechanical Properties Of Microstructural Systemmentioning

confidence: 99%

Kinetics of Mechanical Alloying, Mechanical Properties of Micro and Nanostructural Al-C Systems

Besterci¹,

Sülleiová

Velgosová

2012

High Temperature Materials and Processes

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A method of mechanical alloying process is described. Carbon transformation to Al 4 C 3 is characterized within the different heat treatment schedules and nine commercial carbon powders are tested. The micromecha nism of carbon incorporation into the metallic powder, and its compacting are described. The influence of dis persed carbides on mechanical properties is evaluated together with the influence of deformation on microstruc ture and properties. It was proved that the transformation efficiency of carbon to Al 4 C 3 by heat treatment of alumin ium with the porous furnace black and electrographite is higher than that of the hard cracked graphite. Microstruc ture changes consisted of the fracture processes and welding of the particles with incorporation of C phase and forming of final granules. The dispersed phase Al 4 C 3 parti cle size was measured on thin foil structures, and it was constant and as small as 30 nm. The particle size was influenced neither by the carbon type nor by the heat treatment technology applied. Subgrain size measured in the range of 100 grains in thin foils depended on the carbon type, as well. It ranged from 0.3 to 0.7 mm. Using a DSI (depth sensing indentation technique), the Martens hardness, indentation modulus E and deformation work W for Al matrix and Al 4 C 3 particles have been measured. The temperature dependence of ductility, and reduction of area in the temperature range of 623-723 K and strain rate of 10 −1 s −1 , indicated a considerable increase of these properties. In a case when the volume fraction of Al 4 C 3 changes from lower to higher, the grain rotation mecha nism dominates instead of the grain boundary sliding. The comparison of the tensile test results and changes in fracture for the AlAl 4 C 3 system at two temperatures and two strain rates is summarized. The dependence of the minimum deflection rate on the applied force as well as the dependence of the time to fracture on the applied force for two temperature levels (623 and 723 K) by small punch testing are depicted. The composite was tested in two dif ferent states: a) as received by mechanical alloying with hot extrusion (HE) as the final operation and b) ECAPed (mean grain size of 100-200 nm). The dependence of the minimum deflection rate on the applied force as well as the dependence of the time to fracture on the applied force for two temperature levels are evaluated. The anisotropy of the creep properties and fracture using small punch tests for the AlAl 4 C 3 system produced by ECAP were analysed.

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Untitled

Cited by 10 publications

References 5 publications

Observation of Anisotropy of Creep Fracture Using Small Punch Test for Al-Al4C3 System Produced by Equal Channel Angular Pressing

Observation of Anisotropy of Creep Fracture Using Small Punch Test for Al-Al4C3 System Produced by Equal Channel Angular Pressing

HIGH TEMPERATURE MECHANICAL PROPERTIES OF Al-Al4C3 COMPOSITE PRODUCED BY MECHANICAL ALLOYING

Kinetics of Mechanical Alloying, Mechanical Properties of Micro and Nanostructural Al-C Systems

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