Powder-metallurgy preparation of NiTi shape-memory alloy using mechanical alloying and spark-plasma sintering
Pavel NovákInstitute of Chemical Technology, Department of Metals and Corrosion Engineering, Technická 5, 166 28 Prague 6, Czech RepublicHynek MoravecInstitute of Chemical Technology, Department of Metals and Corrosion Engineering, Technick 5, 166 28 Prague 6, Czech RepublicVladimír VojtěchInstitute of Chemical Technology, Department of Metals and Corrosion Engineering, Technická 5, 166 28 Prague 6, Czech RepublicAnna KnaislováInstitute of Chemical Technology, Department of Metals and Corrosion Engineering, Technická 5, 166 28 Prague 6, Czech RepublicAndrea ŠkolákováInstitute of Chemical Technology, Department of Metals and Corrosion Engineering, Technická 5, 166 28 Prague 6, Czech RepublicTomáš František KubatíkInstitute of Plasma Physics AS CR, v.v.i., Za Slovankou 3, 182 00 Prague 8, Czech RepublicJaromı́r KopečekInstitute of Physics of the ASCR, v. v. i., Na Slovance 2, 182 21 Prague 8, Czech Republic
2017en
ABI
Аннотация
In this work a combination of mechanical alloying and spark-plasma sintering was tested as a promising route for the preparation of a nanocrystalline NiTi shape-memory alloy. The mechanism of mechanical alloying was investigated. Results revealed that the Ti2Ni phase forms preferentially, being followed by the NiTi phase (austenite B2 structure) and a small amount of Ni3Ti. During spark-plasma sintering, only minor changes occurred in the phase composition, i.e., precipitation of the Ni4Ti3 phase and the partial transformation of NiTi to monoclinic martensite. The selected technology leads to a very high compression strength (approx. 2300 MPa), but also high brittleness.
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