Effects of Cu on the microstructural and mechanical properties of sputter deposited Ni-Ti thin films

SURFACE & COATINGS TECHNOLOGY

卷:237

Article; Proceedings Paper

Callisti, M.¹  Tichelaar, F. D.²  Mellor, B. G.³  Polcar, T.^1,4 

[1] Univ Southampton, Fac Engn & Environm, Natl Ctr Adv Tribol Southampton, Southampton SO17 1BJ, Hants, England

[2] Delft Univ Technol, Kavli Inst Nanosci, Natl Ctr HREM, NL-2628 CJ Delft, Netherlands

[3] Univ Southampton, Fac Engn & Environm, Mat Res Grp, Southampton SO17 1BJ, Hants, England

[4] Czech Tech Univ, Fac Elect Engn, Dept Control Engn, CR-16635 Prague 6, Czech Republic

关键词: Shape memory alloys;    Thin films;    Magnetron;    Sputtering;    Nanoindentation;    Grain boundary segregation;    Precipitation;   

DOI  :  10.1016/j.surfcoat.2013.06.040

来源: Elsevier

【 摘 要 】

The microstructure of sputter deposited Ti-rich Ni-Ti thin films doped with Cu in the range 0-20.4 at.% and annealed for 1h at 500 and 600 degrees C has been investigated and correlated with the mechanical properties of the films measured by depth-sensing nanoindentation. X-ray diffraction analysis showed the microstructural evolution of Ni-Ti thin films when doped with Cu and annealed at different temperatures. Heat treatments promoted the nucleation and growth of Ti2Ni precipitates in Ti-rich Ni-Ti thin films, which affected the stability of austenitic and martensitic phases at ambient temperature. Doping with Cu caused the formation of Ti(Ni, Cu)(2) plate precipitates, which became more finely and densely dispersed in the grains with increasing Cu content. TEM analysis showed a columnar grain morphology extended through the whole films thickness, while with increasing Cu content a noticeable lateral grain refinement was induced by segregation of a (Ni, Cu)-rich phase to grain boundaries. The nano-hardness increased almost linearly with increasing Cu content owing to this grain refinement, though differences between samples annealed at different temperatures were found which could be related to the evolution of Ti(Ni, Cu)(2) plate precipitates with annealing temperature and Cu content. The Young's modulus exhibited a similar dependence on Cu content as nano-hardness, though no significant differences were observed with increasing annealing temperatures. Crown Copyright (C) 2013 Published by Elsevier B.V. All rights reserved.

【 授权许可】

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