Powder-metallurgy preparation of NiTi shape-memory alloy using mechanical alloying and spark-plasma sintering.

0479483 - ÚFP 2018 RIV SI eng J - Journal Article
Novák, P. - Moravec, H. - Vojtěch, V. - Knaislová, A. - Školáková, A. - Kubatík, Tomáš František - Kopeček, Jaromír
Powder-metallurgy preparation of NiTi shape-memory alloy using mechanical alloying and spark-plasma sintering.
Materiali in Tehnologije. Roč. 51, č. 1 (2017), s. 141-144. ISSN 1580-2949. E-ISSN 1580-3414
R&D Projects: GA ČR(CZ) GA14-03044S
Institutional support: RVO:61389021 ; RVO:68378271
Keywords : mechanical alloying * spark plasma sintering * NiTi * shape memory alloy
OECD category: Materials engineering; Materials engineering (FZU-D)
Impact factor: 0.590, year: 2017
https://www.researchgate.net/publication/313900224_Powder-metallurgy_preparation_of_NiTi_shape-memory_alloy_using_mechanical_alloying_and_spark-plasma_sintering

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.
Permanent Link: http://hdl.handle.net/11104/0275615