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Kopeček J, Bartha K, Mušálek R, Pala Z, Chráska T, Beran P, Ryukhtin V, Strunz P, Nováková J, Stráský J, Novák P, Heczko O, Landa M, Seiner H, Janeček M. Structural characterization of semi-heusler/light metal composites prepared by spark plasma sintering. Sci Rep 2018; 8:11133. [PMID: 30042481 PMCID: PMC6057958 DOI: 10.1038/s41598-018-29479-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Accepted: 07/12/2018] [Indexed: 11/26/2022] Open
Abstract
A composite of powders of semi-Heusler ferromagnetic shape memory and pure titanium was successfully prepared by spark plasma sintering at the temperature of 950 °C. Sintering resulted in the formation of small precipitates and intermetallic phases at the heterogeneous interfaces. Various complementary experimental methods were used to fully characterize the microstructure. Imaging methods including transmission and scanning electron microscopy with energy dispersive X-ray spectroscopy revealed a position and chemical composition of individual intermetallic phases and precipitates. The crystalline structure of the phases was examined by a joint refinement of X-ray and neutron diffraction patterns. It was found that Co38Ni33Al29 decomposes into the B2-(Co,Ni)Al matrix and A1-(Co,Ni,Al) particles during sintering, while Al, Co and Ni diffuse into Ti forming an eutectic two phase structure with C9-Ti2(Co,Ni) precipitates. Complicated interface intermetallic structure containing C9-Ti2(Co,Ni), B2-(Co,Ni)Ti and L21-(Co,Ni)(Al,Ti) was completely revealed. In addition, C9-Ti2(Co,Ni) and A1-(Co,Ni,Al) precipitates were investigated by an advanced method of small angle neutron scattering. This study proves that powder metallurgy followed by spark plasma sintering is an appropriate technique to prepare bulk composites from very dissimilar materials.
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Affiliation(s)
- Jaromír Kopeček
- Institute of Physics, The Czech Academy of Sciences, Na Slovance 1999/2, Prague, 182 00, Czech Republic.
| | - Kristína Bartha
- Department of Physics of Materials, Charles University, Ke Karlovu 5, Prague, 121 16, Czech Republic
| | - Radek Mušálek
- Institute of Plasma Physics, The Czech Academy of Sciences, Za Slovankou 1782/3, Prague, 182 00, Czech Republic
| | - Zdeněk Pala
- Institute of Plasma Physics, The Czech Academy of Sciences, Za Slovankou 1782/3, Prague, 182 00, Czech Republic
| | - Tomáš Chráska
- Institute of Plasma Physics, The Czech Academy of Sciences, Za Slovankou 1782/3, Prague, 182 00, Czech Republic
| | - Přemysl Beran
- Nuclear Physics Institute, The Czech Academy of Sciences, Řež 130, Řež, Prague, 250 68, Czech Republic
| | - Vasyl Ryukhtin
- Nuclear Physics Institute, The Czech Academy of Sciences, Řež 130, Řež, Prague, 250 68, Czech Republic
| | - Pavel Strunz
- Nuclear Physics Institute, The Czech Academy of Sciences, Řež 130, Řež, Prague, 250 68, Czech Republic
| | - Jaroslava Nováková
- Department of Surface and Plasma Science, Charles University, V Holešovičkách 2, Prague, 180 00, Czech Republic
| | - Josef Stráský
- Department of Physics of Materials, Charles University, Ke Karlovu 5, Prague, 121 16, Czech Republic
| | - Pavel Novák
- Department of Metals and Corrosion Engineering, University of Chemistry and Technology Prague, Technická 5, Prague, 166 28, Czech Republic
| | - Oleg Heczko
- Institute of Physics, The Czech Academy of Sciences, Na Slovance 1999/2, Prague, 182 00, Czech Republic
| | - Michal Landa
- Institute of Thermomechanics, The Czech Academy of Sciences, Dolejškova 1402/5, Prague, 182 00, Czech Republic
| | - Hanuš Seiner
- Institute of Thermomechanics, The Czech Academy of Sciences, Dolejškova 1402/5, Prague, 182 00, Czech Republic
| | - Miloš Janeček
- Department of Physics of Materials, Charles University, Ke Karlovu 5, Prague, 121 16, Czech Republic
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