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Two‐Directional TiNi Shape Memory Alloy Film
Author(s) -
Takagi H.,
Okano K.,
Juodkazis S.,
Matsuo S.,
Misawa H.
Publication year - 2003
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.200300347
Subject(s) - shape memory alloy , materials science , alloy , austenite , curvature , bending , martensite , metallurgy , sputtering , composite material , diffusionless transformation , thin film , microstructure , geometry , nanotechnology , mathematics
A change from a memorized convex to a concave curvature between 10 °C for the martensitic and 50 °C for the austenitic transition is the important feature of a novel two‐directional shape TiNi memory alloy film fabricated by sputtering. The key to two‐directional actuation is Ti 3 Ni 4 precipitate formation attained by an Ni enrichment (55.6 %) in the alloy. The Figure shows the bending of a strip placed over a steaming cup of tea after 0.1 to 0.4 seconds.