Manufacturing Technology 2014, 14(3):387-392 | DOI: 10.21062/ujep/x.2014/a/1213-2489/MT/14/3/387

Application of Microscopy and X-ray Diffraction in Optimization of the Production of NiTi Alloy by Powder Metallurgy

Pavel Novák1, Andrea Školáková1, Vladimír Vojtěch1, Anna Knaislová1, Petr Pokorný1, Hynek Moravec1, Jaromír Kopeček2, Miroslav Karlík3, Tomáš František Kubatík4
1 Institute of Chemical Technology, Prague, Department of Metals and Corrosion Engineering, Technická 5, 166 28 Prague 6, Czech Republic
2 Institute of Physics of the ASCR, v. v. i., Na Slovance 2, 182 21 Prague 8, Czech Republic
3 Czech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Department of Materials, Trojanova 13, 120 00 Prague 2, Czech Republic
4 Institute of Plasma Physics AS CR, v.v.i., Za Slovankou 1782/3, 182 00 Prague 8, Czech Republic

This paper describes the dependence of microstructure of NiTi shape memory alloy on the conditions of nonconventional powder metallurgy processing routes - reactive sintering of compressed Ni+Ti powder mixture and mechanical alloying with consequent compaction by Spark Plasma Sintering. First method was chosen as the process enabling to yield the high-purity NiTi alloy, while the second one aimed to reach the ultrafine-grained microstructure. The microstructure and phase composition of the products are compared in this work. The positive effects of high heating rate (> 300 K.min-1) and high temperature (at least 900 °C) on the reactive sintering process were recognized. Microstructure of the product is composed by NiTi matrix with dispersed Ti2Ni particles. Similar microstructure can be also obtained by mechanical alloying for at least 120 min and consequent compaction by Spark Plasma Sintering.

Keywords: powder metalurgy, NiTi, mechanical alloying, reactive sintering

Published: October 1, 2014  Show citation

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Novák P, Školáková A, Vojtěch V, Knaislová A, Pokorný P, Moravec H, et al.. Application of Microscopy and X-ray Diffraction in Optimization of the Production of NiTi Alloy by Powder Metallurgy. Manufacturing Technology. 2014;14(3):387-392. doi: 10.21062/ujep/x.2014/a/1213-2489/MT/14/3/387.
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