ISSN: 1003-6326
CN: 43-1239/TG
CODEN: TNMCEW

Vol. 3    No. 2    June 1993

TWO KINDS OF VARIANT IN SHAPE MEMORY MATERIAL
Lin; Guangming Lai; J L Huan; Yuanshi Zhongshan University; Guangzhou 510275; China
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Abstract: In shape memory materials,that have been trained to have a two way shape memory effect(TWSM),the martensitic variants are classified into two groups,i.e.,preferentially oriented variants and self-accommodating variants.Applied stress may promote or constrain the transition of preferentially oriented variants and so change transformation temperatures but has no essential effect on self-accommodating variants.According to the point of view mentioned above,some experimental phenomena during thermocycling of a TWSM device may be ex- plained,such as the absence of synchronization between the plot of resistance change.temperature and the plot of memory strain vs.temperature.
Key words: shape memory alloy; martensitic variant; transformation; constraint heating; phase interface
Superintended by The China Association for Science and Technology (CAST)
Sponsored by The Nonferrous Metals Society of China (NFSOC)
Managed by Central South University (CSU)