Mechanism of reaction of molten NiTi with EBM graphite crucible

Abstract

Ultra clean NiTi shape memory alloy was produced by electron beam melting of Ni rich vacuum inductionally melted butts together with pure Ti chunks in both condensed and electrographite crucibles. A hollow cathode discharge gun was used for heating up to 1623, 1653 and 1693 K and holding the charge materials under vacuum for 300, 600, 900 and 1200 s. Effects of temperature, time and compactness of the crucible on formation/disappearance of the hard compounds like Ni₃Ti, Ti₄Ni₂O, Ti₄Ni₂C, Ti₃Ni₂OC and TiC were determined by X-ray diffraction, scanning electron microscopy and energy dispersive X-ray analysis. A combination of the experimental results with the kinetic rate equations indicated that the reaction between NiTi and the crucible obeyed first order transfer kinetics with carbon intake activation energy of 225·8 kJ mol^–1 for the NiTi shape memory alloy melt.

Keywords

NITI EBM SMA TRANSFER KINETICS MECHANISM GRAPHITE CRUCIBLE CONDENSED GRAPHITE ELECTROGRAPHITE

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