EMPIRICAL RELATIONSHIP BETWEEN RECOVERABLE STRAIN ENERGY AND TEMPERATURE FOR TiNi AND TiNiCu ALLOYS

Abstract

Abstract: Based on experimental study of the time dependence of the recoverable shape memory effect (SME)of shape memory alloys Ti50Ni50,Ti50Ni48Cu2 and Ti50Ni45Cu5 an empirical re- lationship between recoverable strain energy,U_r,and temperature,T.was derived as: U_r=U_o[1-exp(-mT_R~n)] where m—characteristic constant related to material,and n-shape-temperature sensitivity. The Johnson-Mehl-Aerami's phenomenological description of the time dependence of phase transformation was adopted to obtain a semiquantitative relationship associated with recoverable SME.between thermoelastic martensite transformation and temperature.This semiquantitative relationship is correspondent with the empirical expression.

Key words: shape memory effect, recoverable strain energy, shape-temperature sensitivity, thermoelastic martensite

LI Yongsen JIN Yongbai YU Ronghai Institute of Metal research,Academia Sinica,Shenyang,China Associate Professor,Institute of Metal Research,Academia Sinica,Shenyang 110015,China. EMPIRICAL RELATIONSHIP BETWEEN RECOVERABLE STRAIN ENERGY AND TEMPERATURE FOR TiNi AND TiNiCu ALLOYS[J]. Acta Metallurgica Sinica (English Letters), 1993, 6(1): 21-25.

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EMPIRICAL RELATIONSHIP BETWEEN RECOVERABLE STRAIN ENERGY AND TEMPERATURE FOR TiNi AND TiNiCu ALLOYS

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