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Matyja, Henryk
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booksection
Synthesis of powder alloys in Ni-Al-Nb-C system by mechanical alloying
Abstract
<p>Structure and phase composition of the mechanically alloyed nanocrystalline Ni-Al-Nb-C alloys with a constant content of Nb and C (5 at. % of each element) and various contents of Ni and Al were investigated. It was shown that in the alloys with C<sub>Ni</sub>/C<sub>Al</sub> = 1÷1.6, the interaction between Ni and Al, and Nb and C occurs independently because of the high negative formation enthalpies of NiAl and NbC. As a result, stable phases NiAl<sub>1-x</sub> (B2 structure) and non-stoichiometric carbide NbC<sub>x</sub> were formed during milling. When the ratio C<sub>Ni</sub>/C<sub>Al</sub>≥ 2.5, a supersaturated solid solution Ni(Al, Nb, C) with the fcc- structure was formed during the MA. Further heating up to 700°C leads to the dissociation of the solid solution; Ni<sub>3</sub>AlC<sub>x</sub> phase (Ll<sub>2</sub>) and non-stoichiometric carbide NbC<sub>x</sub> appear after the heating. The DSC curve of this alloy exhibits an exothermic effect, which corresponds to the dissociation process. Hardness was measured in pressed and sintered (700 MPa, 1200°C, 2 hours) samples; the dependence between the hardness and structure of the intermetallic matrix was found.</p>