Development of New B2 Type Shape Memory Alloys end theirs Application for Multi-functional Devices.

新型B2型形状记忆合金的开发结束了其在多功能器件中的应用。

基本信息

批准号：
13555181
负责人：
KAINUMA Ryosuke
金额：
$ 8.83万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

Shape memory (SM) material which possesses double functions of thermo-sensor and actuator is one of the typical smart materials. Although the SM devices yield larger power and displacement than the ferroelectric one, they have a very serious problem in which the response for input signal is too slow, because the thermal conductivity in the SM devices is a rate determining process. Recently, ferromagnetic Shape memory (FSM) alloys that can be operated by magnetic field have been developed in the Ni-Mn-Ga system. In the present study, new type of FSMAs, Co-Ni-Al alloys with B2 bcc ordered structure were investigated.. The details of results obtained by the present work are as follows:(1) Transformation temperatures: Martensitic transformation temperature (Ms) and Curie temperature (Tc) were determined by DSC and VSM measurement. Some alloys have Ms and To in relatively high temperatures region over room temperature. This result means that the Co-Ni-Al alloys can be a candidate of the promising FSMA.(2) Crystal structure: The parent and martensits phases have B2 and Ll_0 structures, respectively. The c/a ration of the Ll_0, phase is 0.81.(3) Shape memory and mechanical properties: Coexistence with γ phase improves the ductility of alloys and a perfect SM can be obtained by a training treatment.(4) Magnetic properties: Magnetic anisotropies of austenite and martensite phases were determined using single crystals, and magnetostriction of about 0.3% was detected.(5) FSM wire, FSM wire with 0.5 to 1.0mmf could be produced by conventional techniques of rolling and drawing. The obtained wire showed a pseudoelastic behavior.

形状存储器（SM）材料潜在热传感器和执行器的双重功能是典型的智能材料之一。尽管SM设备比铁电设备产生的功率和位移更大，但它们存在一个非常严重的问题，其中输入信号的响应太慢，因为SM设备中的热导率是确定过程的速率。最近，我们在Ni-MN-GA系统中开发了可以通过磁场操作的铁磁形状记忆（FSM）合金。在本研究中，研究了新型的FSMAS，具有B2 BCC有序结构的共同合金。本工作获得的结果的详细信息如下：（1）转化温度：Martensisitic转化温度（MS）和Curie温度（TC）通过DSC和VSM测量确定。一些合金具有MS，并且在相对较高的室温区域中。该结果意味着共同合金可以是承诺的FSMA的候选者。（2）晶体结构：父阶段分别具有B2和LL_0结构。 LL_0，相位为0.81。（3）形状记忆和机械性能：与γ相共存改善合金的延展性和完美的SM可以通过训练治疗来获得。（4）磁性特性：使用单晶和Magnetostrictiation（5％）确定了奥氏体和马齿相的磁动体，并确定了奥氏体和马丁石相的磁动脉。传统的滚动和绘图技术可以生产具有0.5至1.0mmf的FSM线。获得的电线显示出假弹性行为。