Characterization of spark-eroded shape memory alloy powders obtained in cryogenic liquids

Fine powders of Ti–Ni–Zr–Cu and Ni–Mn–Ga alloys with the particle dimensions ranging from tenths of micrometers down to 10 nm have been prepared by the spark erosion method in liquid nitrogen and argon. The as-processed powder particles with typical sizes less than 50–70 μm have a spherical shape. T...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2008-05, Vol.481, p.643-646
Main Authors: Monastyrsky, G.E., Yakovenko, P.A., Kolomytsev, V.I., Koval, Yu.N., Shcherba, A.A., Portier, R.
Format: Article
Language:English
Subjects:
Ferromagnetic SMAs
Fine powders
NiTi SMAs
Spark erosion method
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Summary:Fine powders of Ti–Ni–Zr–Cu and Ni–Mn–Ga alloys with the particle dimensions ranging from tenths of micrometers down to 10 nm have been prepared by the spark erosion method in liquid nitrogen and argon. The as-processed powder particles with typical sizes less than 50–70 μm have a spherical shape. There are some pores within some of the spherical particles. The surface of the spherical particles shows bubble-like features. The chemical compositions of the powders were practically similar to the compositions of the origin materials. The powders obtained in cryogenic liquids were almost free of the carbon contamination. Both austenitic and martensitic phases were found in Ti–Ni–Zr–Cu powders at room temperature. To activate martensitic transformations in smallest powder particles of Ni–Mn–Ga, preliminary thermal treatments of the as-sparked powders were required.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2006.12.213