MARTENSITE AND REVERSE TRANSFORMATION IN PRESTRAINED TiNi SHAPE MEMORY ALLOY THIN FILM
来源期刊：Acta Metallurgica Sinica2003年第3期
论文作者：M.Z.Cao X.P.Liu R.Yang
Key words：shape memory alloy; TiNi film; pre-strain; phase transformation;
Abstract: The effect of pre-strain on phase transformation of TiNi shape memory alloy film was studied by differential scanning calorimeter measurement (DSC). Compared with un deformed TiNi film, the reverse transformation of pre-strained specimens was elevated to a higher temperature on the first heating, but martensite and reverse transforma tion on subsequent thermal cycles occurred at a lower temperature. The evolution of transformation behavior in pre-strained TiNi film was related to the change of elastic strain energy, irreversible energy and internal stress field.
M.Z.Cao1，X.P.Liu1，R.Yang1
(1.Institute of Metal Research, The Chinese Academy of Sciences, Shenyang,110016, China)
Abstract:The effect of pre-strain on phase transformation of TiNi shape memory alloy film was studied by differential scanning calorimeter measurement (DSC). Compared with un deformed TiNi film, the reverse transformation of pre-strained specimens was elevated to a higher temperature on the first heating, but martensite and reverse transforma tion on subsequent thermal cycles occurred at a lower temperature. The evolution of transformation behavior in pre-strained TiNi film was related to the change of elastic strain energy, irreversible energy and internal stress field.
Key words:shape memory alloy; TiNi film; pre-strain; phase transformation;
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