Results found: 3

Number of results on page

Search results

Sort By:

Limit search:

Effect of Si and Fe on the Recrystallization Response of Al-Mn Alloys with Zr Addition

100%

Karlík M., Mánik T., Slámová M., Lauschmann H.

Acta Physica Polonica A

2012

vol. 122

issue 3

469-474

Al-Mn alloys are often used for the production of automotive heat exchanger fins. During brazing at about 600°C, recrystallization and grain coarsening resulting in the reduction of the strength and possible buckling of the fin can occur. In order to obtain a good recrystallization resistance, the alloy should contain a dense and homogeneous distribution of second phase particles. The effect of Si and Fe addition on the recrystallization response of Al-Mn-Zr alloys direct-chill cast in the laboratory conditions and twin-roll cast in the industrial conditions was examined. Microstructure of the alloys was characterized during downstream processing. The particles were analyzed by light metallography, energy dispersive X-ray spectroscopy and by means of electron backscattering diffraction. Computer assisted quantitative particle analysis was carried out on field emission gun-scanning electron microscope micrographs. Vickers hardness and electrical conductivity were measured at thicker sheets, while at the final gauge of 65 μm the 0.2% proof stress was evaluated. The best recrystallization resistance had twin-roll cast alloy containing 0.5 wt% Si and 0.2 wt% Fe.

High Temperature Oxidation of Spark Plasma Sintered and Thermally Sprayed FeAl-Based Iron Aluminides

76%

Haušild P., Karlík M., Skiba T., Sajdl P., Dubský J., Palm M.

Acta Physica Polonica A

2012

vol. 122

issue 3

465-468

The presented work deals with the oxidation resistance of spark plasma sintered and thermally sprayed FeAl-based intermetallics. Gas-atomized binary single phase Fe-43(at.%)Al and dual phase Fe-55(at.%)Al powders were used for spark plasma sintering and/or thermal spraying. Coatings were deposited by two different plasma spray technologies - gas and water stabilized plasma guns. The prepared samples were exposed to oxidation in artificial air at 700°C. The mass gain was measured during oxidation at 700C up to 1000 h. Microstructures, phase and chemical compositions of the formed scales were characterized after the exposition by means of scanning electron microscopy, X-ray diffraction and electron spectroscopy for chemical analysis (X-ray photoelectron spectroscopy).

Effect of Heating Rate on the Formation of Intermetallics during SHS Process

64%

Novák P., Michalcová A., Školáková A., Průša F., Kříž J., Marek I., Kubatík T., Karlík M., Haušild P., Kopeček J.

Acta Physica Polonica A

2015

vol. 128

issue 4

561-563

Self-propagating high-temperature synthesis is a simple and efficient method for the synthesis of various compounds including ceramics and intermetallics. In this process, the compressed mixture of elemental or master alloy powders is ignited or heated to initiate the exothermic reactions leading to the formation of desired compounds. In order to control the process efficiently, the effect of several important parameters has to be determined in each applied alloy system. Previous results showed that those parameters are: initiation temperature, process duration, pressure used for compression and heating rate. This paper is devoted to the description and explanation of the effect of the heating rate on the formation of intermetallics during self-propagating high-temperature synthesis in Fe-Al and Ni-Ti systems. Differential thermal analysis of compressed powder mixtures under various heating conditions and microstructure observation of samples prepared by various heating rates using electric resistance heating and spark plasma sintering were carried out. The effect of heating rates on the formations of intermetallics in studied systems is discussed in this paper.

Refine search results

3 Acta Physica Polonica A

1 2015

2 2012

3 Karlík M.

2 Haušild P.

1 Dubský J.

1 Kopeček J.

1 Kubatík T.

1 Kříž J.

1 Lauschmann H.

1 Marek I.

1 Michalcová A.

1 Mánik T.

1 Novák P.

1 Palm M.

1 Průša F.

1 Sajdl P.

1 Skiba T.

1 Slámová M.

1 Školáková A.

Search results

Effect of Si and Fe on the Recrystallization Response of Al-Mn Alloys with Zr Addition

High Temperature Oxidation of Spark Plasma Sintered and Thermally Sprayed FeAl-Based Iron Aluminides

Effect of Heating Rate on the Formation of Intermetallics during SHS Process