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High plasticity of an iron aluminide-based material at low temperatures
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SYSNO ASEP 0496640 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title High plasticity of an iron aluminide-based material at low temperatures Author(s) Šíma, V. (CZ)
Minárik, P. (CZ)
Cieslar, M. (CZ)
Král, R. (CZ)
Málek, P. (CZ)
Chráska, Tomáš (UFP-V) RID, ORCID
Lukáč, František (UFP-V) ORCID
Seiner, Hanuš (UT-L) RID, ORCID
Průša, F. (CZ)Number of authors 9 Article number PSIJ.41673 Source Title Physical Science International Journal. - Hooghly : Science Domain - ISSN 2348-0130
Roč. 18, č. 2 (2018)Number of pages 11 s. Language eng - English Country IN - India Keywords intermetallics ; powder metallurgy ; mechanical properties ; scanning electron microscopy ; transmission electron microscopy Subject RIV JP - Industrial Processing OECD category Materials engineering R&D Projects GA15-15609S GA ČR - Czech Science Foundation (CSF) GA17-13573S GA ČR - Czech Science Foundation (CSF) Institutional support UFP-V - RVO:61389021 DOI 10.9734/PSIJ/2018/41673 Annotation Aims: To compare surprisingly high plasticity in compression at low temperature of high-quality compacts prepared by spark plasma sintering from atomized Fe-30.8Al-0.35Zr-0.11B (at%) powder with tensile tests at the same conditions.
Study design: Compressive tests and tensile tests at room temperature and at 77 K, scanning and transmission electron microscopy, measurements of Young’s and shear moduli data of the sintered material from room temperature to 80 K.
Place and Duration of Study: Faculty of Mathematics and Physics, Institute of Plasma Physics, Institute of Thermomechanics, Department of Metals and Corrosion Engineering, between October 2015 and November 2017.
Methodology: The feedstock powder was prepared using atomization in argon and consolidated by spark plasma sintering method. The microstructure and phase composition of the sintered samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) with electron backscatter diffraction (EBSD) and by transmission electron microscopy (TEM). Mechanical properties of the feedstock powder were characterized by microhardness data, the compacts were in addition tested in compression and in tension. The elastic properties (Young’s and shear moduli) of the examined material were measured by a combination of two ultrasonic methods: the pulseecho method and the resonant ultrasound spectroscopy.
Results: High plasticity (plastic strain more than 30% without failure) was observed in compressive tests at room temperature and at 77 K. Electron microscopy observations revealed the dominating role of dislocation motion in compression at low temperatures. The ductility measured at tensile tests, on the other hand, was only about 1% with a typical brittle failure.
Conclusion: The TEM observations confirm that dislocations enable the plastic flow in compression at low temperatures. The poor ductility in tension is not an intrinsic behavior of the alloy, but it results from the nucleation and opening of nano/microcracks between sintered powder particles and/or cavities in partly hollow atomized particles.Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2019 Electronic address http://www.journalrepository.org/media/journals/PSIJ_33/2018/Jun/Sima1822018PSIJ41673.pdf
Number of the records: 1