Experimental Research on Mechanical Properties of a New TiNi Shape Memory Alloy

摘要

The shape memory alloy with a shape memory property and pseudo-elastic property has been noted as one of the most attractive smart materials. Especially, the TiNi shape memory alloy shows the high performance compared to other shape memory materials, and has additional excellent properties, for example, anti-erosion property, anti-abrasion property, anti-vibration property and so on. In these days, the Ti-Ni shape memory alloy has been applied in the engineering/industrial field. However, it is rather difficult to produce the homogeneous bulk material, and thus the provided TiNi shape memory material is mainly wire or plate, and thus its application is quite limited (for example, the antenna of mobile telephone, frame of eye-glasses and so on). Recently, our joint research group (university and industry) developed a new technology to produce the homogeneous bulk TiNi shape memory alloy by applying a sintering-powder technology. By using this technology, arbitrary shape of Ti-Ni shape memory material can be obtained in a high quality. In our laboratory, the thermo-mechanical property was confirmed experimentally, by using several loading processes: tension, compression, torsion, and combined loading process of thin-walled tube specimen. In this paper, the results are shown and discussed.