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Języki publikacji
Abstrakty
Purpose: The AgSnBi powder used for electrical contacts has been consolidated in the process of reciprocating extrusion (cyclic extrusion compression - CEC) in 2, 4, 8 and 16 CEC cycles at room temperature. It corresponds to the deformations: 2 CEC cycles - ϕ = 0.84, 4 CEC cycles - ϕ = 1.68, 8 CEC cycles - ϕ = 3.36 and 16 CEC cycles - ϕ = 6.72. The microstructure of consolidated powder has been characterized by optical microscopy (MO), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). It was found characteristic granular microstructure with the oxides film at granular boundaries. Some voids and cracks were observed in consolidated samples, especially at higher magnifications. Inside the consolidated granules the nano-microstructure with nano - twins was found. Microhardness of AgSnBi after the consolidation by the CEC process achieved level of about 100-110 μHV. The microhardness of samples consolidated by CEC and then hydrostatically extruded increase of about 20 μHV units. Design/methodology/approach: The investigations of microstructure were performed by optical microscopy (MO) Olympus GX51, and scanning electron microscopy SU-70 with field emission gun thermally aided. The microhardness of consolidated samples was measured by Vickers method. Findings: The microstructures of consolidated AgSnBi powders were observed and analyzed. On the base of the microstructure and microhardness investigations the mechanisms of formation of bulk material from powder by severe plastic deformation (SPD) methods was discussed. Practical implications: The performed investigations contribute to the understanding of processes of deformation in the range of unconventional strains exerted by the SPD methods. The new way of consolidation of powders using to the production of electrical contacts was presented. Originality/value: It was assumed that AgSnBi powder consolidated by CEC and hydrostatic extrusion exhibited the nano-microstructure.
Wydawca
Rocznik
Tom
Strony
120--124
Opis fizyczny
Bibliogr. 8 poz.
Twórcy
autor
- AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Kraków, Poland
autor
- AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Kraków, Poland
autor
- AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Kraków, Poland
autor
- AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Kraków, Poland
autor
- AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Kraków, Poland
autor
- Institute of High Pressure Physics of the Polish Academy of Sciences, ul. Sokołowska 29/37, 01-142 Warszawa, Poland
Bibliografia
- [1] I. Karaman, M. Haouaoui, H.J. Maier, Nanoparticle consolidation using equal channel angular Extrusion at room temperature, Journal of Materials Science 42/5 (2007) 1561-1576.
- [2] D. Canadic, H.J. Maier, M. Haouaoui, I. Karaman, On the cyclic stability of nanocrystalline copper obtained by powder consolidation at room temperature, Scripta Materialia 58 (2008) 307-310.
- [3] O.N. Senkov, S.V. Senkova, J.M. Scott, D.B. Miracle, Compaction of amorphous aluminum alloy powder by direct extrusion and equal channel angular extrusion, Materials Science and Engineering 393/1-2 (2005) 12-21.
- [4] M. Umemoto, B.D. Long, Y. Todaka, K. Tsuchiya, Work softening high pressure phase formation and powder consolidation by HPT, Materials Science Forum 654-656 (2010) 1205 1210.
- [5] M. Richert, J. Richert, A. Hotloś, P. Pałka, W. Pachla, M. Perek, Ag powders consolidated by reciprocating extrusion (CEC), Materials Science Forum 667-669 (2011) 145-150.
- [6] M.W. Richert, J. Richert, M. Książek, A. Hotloś, P. Pałka, M. Perek, M. Maślanka, Microstructure of AgNi and AgSnBi powders consolidated by CEC, Materials Science Forum 667-669 (2011) 145-150.
- [7] G. Matula, K. Gołombek, J. Mikuła, L.A. Dobrzański, Structure of sintered gradient tool materials, Journal of Achievements in Materials and Manufacturing Engineering 32/1 (2009) 22-28.
- [8] T.W. Kim, P. Determination of densification behavior of Al-SiC metal matrix composites during consolidation processes, Materials Science and Engineering 483-484 (2008) 648-651.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-a1bb283c-c595-48bd-acbc-74ecb74f80c1