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Formation of pores and amorphous-nanocrystalline phases in porous TiNi alloys made by self-propagating high-temperature synthesis (SHS)

  • The objective of this study was to examine the mechanism how the surface of porous TiNi compounds produced by SHS method evolves. The prepared samples were investigated using light-microscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive x-ray spectroscopy (EDS). The results indicated that the surface of all pores is represented by a granular stratum due to dendrite liquation by peritectic crystallization mechanism. The voids of 2–15 μm in size are formed owing to a capillary spreading of the liquid. Reaction gases with dissociated carbon, nitrogen, and oxygen are responsible for heat-and-mass transfer through the forming pores. High pressure-temperature effect of reaction gases on the melt causes the forming voids to coalesce, as well as transfers the peritectic liquid (PL) throughout the open pores catalyzing a distinctive spitted topography. It is through the chemisorption of gasiform nonmetallics by the pore surface melt, where these impurities areThe objective of this study was to examine the mechanism how the surface of porous TiNi compounds produced by SHS method evolves. The prepared samples were investigated using light-microscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive x-ray spectroscopy (EDS). The results indicated that the surface of all pores is represented by a granular stratum due to dendrite liquation by peritectic crystallization mechanism. The voids of 2–15 μm in size are formed owing to a capillary spreading of the liquid. Reaction gases with dissociated carbon, nitrogen, and oxygen are responsible for heat-and-mass transfer through the forming pores. High pressure-temperature effect of reaction gases on the melt causes the forming voids to coalesce, as well as transfers the peritectic liquid (PL) throughout the open pores catalyzing a distinctive spitted topography. It is through the chemisorption of gasiform nonmetallics by the pore surface melt, where these impurities are chemically bound, that it was formed a massive corrosion-resistant amorphous-nanocrystalline stratified shell deduced as an intermetallic oxycarbonitride layer.show moreshow less

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Author: Victor Gunther, Yuri Yasenchuk, Timofey ChekalkinORCiD, Ekaterina Marchenko, Sergey Gunther, Gulsharat Baigonakova, Valentina Hodorenko, Ji-hoon Kang, Sabine WeißORCiDGND, Aleksei ObrosovORCiD
URL:https://www.sciencedirect.com/science/article/pii/S092188311830387X?via%3Dihub
DOI:https://doi.org/10.1016/j.apt.2018.12.011
ISSN:0921-8831
Title of the source (English):Advanced Powder Technology
Document Type:Scientific journal article peer-reviewed
Language:English
Year of publication:2019
Tag:Heat-and-mass transfer; Pore formation; Porous TiNi alloys; SHS; Surface structures
Volume/Year:30
Issue number:4
First Page:673
Last Page:680
Faculty/Chair:Fakultät 3 Maschinenbau, Elektro- und Energiesysteme / FG Metallkunde und Werkstofftechnik
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