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Reactive Sintering Mechanism and Phase Formation in Ni-Ti-Al Powder Mixture During Heating

Department of Metals and Corrosion Engineering, University of Chemistry and Technology, Prague, Technická 5, 16628 Prague, Czech Republic
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Materials 2018, 11(5), 689; https://doi.org/10.3390/ma11050689
Received: 28 March 2018 / Revised: 23 April 2018 / Accepted: 27 April 2018 / Published: 27 April 2018
This work aims to describe the formation of intermetallics in the Ni-Ti-Al system in dependence on the heating rate, which has been determined previously as the crucial factor of thermal explosion self-propagating synthesis (TE-SHS). The tested alloys contained 1–7 wt % aluminum. Thermal analysis has been realized by the optical pyrometer under the conditions of high heating rates up to 110 °C·min−1. TE-SHS process in Ni-Ti-Al system is initiated by exothermic reaction of nickel aluminides Ni2Al3 and NiAl3 at the temperature of 535–610 °C. The next reactions occur in dependence on the heating rate. Samples containing 1–3 wt % of aluminum exhibit the similar initiation temperature as Ni-Ti binary mixture. The samples containing 5 wt % and more of aluminum were fully reacted after sintering at 800 °C with the heating rate of 300 °C·min−1 and the initiation temperature of the TE-SHS was observed close to Al-Al3Ni eutectic temperature (between 630–640 °C). View Full-Text
Keywords: intermetallics; reactive sintering; self-propagating high-temperature synthesis (SHS); Ni-Ti-Al alloy; differential thermal analysis intermetallics; reactive sintering; self-propagating high-temperature synthesis (SHS); Ni-Ti-Al alloy; differential thermal analysis
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MDPI and ACS Style

Salvetr, P.; Školáková, A.; Hudrisier, C.; Novák, P.; Vojtěch, D. Reactive Sintering Mechanism and Phase Formation in Ni-Ti-Al Powder Mixture During Heating. Materials 2018, 11, 689.

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