EFFECT OF HEAT TREATMENTS ON THE MICROSTRUCTURE AND TRANSFORMATION CHARACTERISTICS OF TiNiPd SHAPE MEMORY ALLOY THIN FILMS

Acta Metallurgica Sinica (English Letters) ›› 2005, Vol. 18 ›› Issue (6): 707-713 .

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EFFECT OF HEAT TREATMENTS ON THE MICROSTRUCTURE AND TRANSFORMATION CHARACTERISTICS OF TiNiPd SHAPE MEMORY ALLOY THIN FILMS

C.C. Zhang, C.S. Yang, G.F. Ding, S.Q. Qian and J.S. Wu

National Key Laboratory of Nano/Micro Fabrication Technology, Key Laboratory for Thin Film and Microfabrication of Ministry of Education, Institute of Micro and Nano Science and Technology, Shanghai Jiaotong University, Shanghai 200030, China

Received:1900-01-01 Revised:1900-01-01 Online:2005-12-25 Published:2009-10-10
Contact: C.C. Zhang

Abstract

Abstract: Microstructure and phase transformation behaviors of the film annealed at different temperatures were studied by X-ray diffractometry (XRD), transmission electron microscopy and differential scanning calorimeter (DSC). Also tensile tests were examined. For increasing annealed temperature, multiple phase transformations, transformations via a B19-phase or direct martensite/austenite transformation are observed. The TiNiPd thin film annealed at 750℃ had relatively uniform martensite/austenite transformation and shape memory effect. Martensite/austenite transformation was also found in strain-temperature curves. Subsequent annealing at 450℃ had minor effect on transformation temperatures of Ti-Ni-Pd thin films but resulted in more uniform transformation and improved shape memory effect.

Key words: Ti-Ni-Pd thin films, microstructure, martensitic phase transformation

C.C. Zhang, C.S. Yang, G.F. Ding, S.Q. Qian , J.S. Wu. EFFECT OF HEAT TREATMENTS ON THE MICROSTRUCTURE AND TRANSFORMATION CHARACTERISTICS OF TiNiPd SHAPE MEMORY ALLOY THIN FILMS[J]. Acta Metallurgica Sinica (English Letters), 2005, 18(6): 707-713 .

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EFFECT OF HEAT TREATMENTS ON THE MICROSTRUCTURE AND TRANSFORMATION CHARACTERISTICS OF TiNiPd SHAPE MEMORY ALLOY THIN FILMS

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