The Shape Memory Effect And Super Elasticity - 2345 Words

INTRODUCTION The Shape Memory Alloys are quite fascinating materials characterised by a Shape Memory effect and Super-elasticity, which ordinary metals and alloys do not have. This unique behaviour was first found in Au-47.5%Cd alloy in 1951, and was publicised by its discovery in a Ti-Ni alloy in 1963. After much research and development thereafter, shape memory alloys are now being practically used as new functional alloys for pipe couplings, antennae for cellular phones and various actuators in electrical appliances, etc. Furthermore, they have attracted keen attention as promising candidate for smart materials since they function as sensors as well as actuators. The shape memory effect and super-elasticity are based on the diffusion less transformation called martensitic transformation. The Shape memory effect is a unique property of certain alloys exhibiting martensitic transformations. Even though the alloy is deformed in low temperature phase, it recovers its original shape by reverse transformation upon heating to a critical temperature called reverse transformation temperature. Many other alloys such as In-T1, 3, 4 Cu-Zn and Cu-Al-Ni were also found. The same alloys have another unique property called Super-elasticity at a higher temperature, which is associated with a large (18%) nonlinear recoverable strain upon loading and unloading. Since these alloys have a unique property in remembering the original shape, having an actuator function and havingShow MoreRelatedApplication Of Shape Memory Alloy Properties1427 Words   |  6 PagesOF SHAPE MEMORY ALLOYS IN INTELLIGENT REINFORCED CONCRETE STRUCTURES (IRCS) 7 2.1. Concept of IRCs 7 2.2. Important Shape Memory Alloy Properties Applied in IRC 7 2.2.1. Shape Memory Effect 7 2.2.2 Thermal Actuation Ability 7 2.2.3 Damping 7 2.3. Experimental Approach 7 2.3.1. Material Used 7 2.3.2 Test Specimen 7 2.3.3 Method 8 2.3.4 Results and Conclusions 9 2.4 Outcomes 11 2.5. Practical Cosiderations 11 2.5.1. Practical Limitations 11 2.5.2. Stoichiometric Considerations 11 2.5.3. Effect of HeatRead MoreIntroduction to Noise and Vibration Damping2431 Words   |  10 Pagesmaterial, but also on the loading frequency, as the viscoelasticity as well as defect response depend on the frequency. Moreover, the damping capacity depends on the temperature. Metals for vibration damping Metals for vibration damping include shape-memory alloys (SMAs), ferromagnetic alloys and other alloys. The SMAs provide damping for the reasons explained in the following paragraphs. Ferromagnetic alloys also provide damping through the magnetomechanical mechanism which is called as movementRead MoreFree Trial6054 Words   |  25 Pagesb. glands c. hormones 2. This __ determines certain behavioral condition of the body. a. Endocrine gland b. pituitary gland. C. adrenal gland 3. 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