機能異方性形状記憶合金の開発と応用

概要

論文の詳細を見る
The crystal grains rotate and slip, maintaining a state of equigranular crystal, in the process of super plasticity deformation. The functional anisotropic Ti-Ni-Cu shape memory alloy fiber was developed, in which this property of super plasticity was applied to trim the direction of fine grains for the designed motion. An idea to use super plasticity in order to derive the property of poly-crystal function materials is rare till now. The method is supposed to provides a way to operate the grain boundary that is a domain of micro or nano meter order directly. The application to other materials except SMA can be expected enough. The characteristics of the material and the result of application are as follows. 1. The material has a two directional shape memory effect of approx. 5 % tensile strain. 2. It is easy to design shape memory alloy actuators with its wide operational range of low stress and large strain. 3. The fiber of the material performed more than 8×108 times reciprocated elongation and contraction of 3 % tensile strain and 100 MPa stress. 4. A servo actuator can be easily made. The servo actuator uses the approximately linear stable electric resistance variation of the material corresponding to a shape-memory effect as a position sensor.
電気製鋼研究会の論文