形状记忆合金的研究进展

形状记忆合金作为一种新型功能材料越来越受到人们的重视，并且在微型智能驱动系统中得到成功应用。从工程应用角度出发，依据材料的实际应用温度，分别概述了对高温和低温两种形状记忆合金的最新研究进展，并展望了其前景。     

磁控形状记忆合金执行器及其应用前景

磁控形状记忆合金可以提供一种产生力和位移的新方法，同时也可以使用此种材料制作传感器。阐述了磁控形状记忆合金的工作原理，介绍了使用磁控形状记忆合金制造的几种实际机构，最后讨论了它们未来的应用。     

TiNi基形状记忆合金薄膜研究进展

TiNi基形状记忆合金薄膜除具有和体材料相同的形状记忆特性外,还因表面积大、散热能力好,改善了体材料响应速度较慢的缺点,在微电子机械系统领域是一种具有广阔应用前景的材料.综述了近年来TiNi基形状记忆合金薄膜研究现状,并对其应用进行了评述.     

形状记忆合金在建筑工程中的应用

概述了形状记忆合金的发展历史和基本性能,对形状记忆合金在建筑工程领域中的应用现状进行了介绍,最后对形状记忆合金材料及其在建筑工程中的应用进行了展望。     

TiNi基形状记忆材料及应用研究进展

综述了TiNi基形状记忆合金最近的基础研究和应用研究进展。对TiNi基形状记忆合金的马氏体相变以及TiNi基高温形状记忆合金、TiNi基形状记忆合金薄膜、TiNi基复合材料以及TiNi基形状记忆合金在航空航天等领域的应用进行了评述和归纳,结合TiNi基形状记忆合金材料和应用研究取得的新进展,认为多功能化,稳定化和集成化是当前TiNi基形状记忆合金研究的主要发展趋势。最后展望了TiNi基形状记忆合金的发展前景。     

Cu基形状记忆合金的应用进展

形状记忆合金作为一种智能型功能材料,自1962年首次获得应用以来,在众多相关领域得到了越来越多的关注和应用。Cu基形状记忆合金以其良好的形状记忆性能、优秀的导电导热性能、相变温度可调范围宽以及价格低廉等诸多优点,成为具有重要发展潜力的一类形状记忆合金。近几年,智能系统的迅速发展和高性能Cu基形状记忆合金的开发较大的推动了Cu基形状记忆合金的应用。综述了近5年Cu基形状记忆合金在交通运输、机械制造、土木建筑、生物医疗等方面的最新应用实例,并对其未来发展方向进行了展望。     

形状记忆合金研究进展与高熵形状记忆合金

形状记忆合金具有形状记忆效应、超弹性、良好的耐蚀性及力学性能等,是一种极具发展潜力和应用价值的功能材料,形状记忆合金自研发之初就受到了人们的广泛关注,目前已在诸多领域得到了广泛应用。系统总结了形状记忆合金的种类、制备方法、主要应用领域和最新的研究成果等,重点综述了目前研究的热点——高熵形状记忆合金的研究进展,并从合金成分、热机械处理、相结构3方面阐明了影响高熵形状记忆合金性能的因素,理清了阻碍形状记忆合金发展的主要因素,分析了高熵形状记忆合金的研究价值,并对形状记忆合金的未来发展方向进行了展望。     

形状记忆合金的发展、制备与应用前景

形状记忆合金是一种新型功能材料，其特有的形状记忆效应使其在机械领域、建筑领域尤其是医学领域发挥着不可替代的作用。本文主要介绍了形状记忆合金的发现与发展、制备方法以及应用前景。     

形状记忆材料的研究和应用

形状记忆材料是刺激响应性材料,能够利用外部的刺激改变它们的形状,包括形状记忆合金、形状记忆陶瓷、形状记忆聚合物三大类,主要介绍了形状记忆合金及聚合物的发展及其应用,并对它们的发展前景做出了展望。     

TiNi形状记忆合金约束态相变及驱动特性研究进展

TiNi形状记忆合金作为一种驱动材料具有广阔的应用前景，同时TiNi合金丝增强复合材料的研究和应用也得到人们的重视。TiNi合金的驱动能力与其约束条件下的相变行为有密切的关系。综述了不同约束态条件下TiNi形状记忆合金丝的马氏体相变特征及其驱动特性的研究进展。     

Recent development of TiNi-based shape memory alloys

Recent developments in China on TiNi-based shape memory alloys (SMAs), including TiNi binary SMAs, TiNiNb wide hysteresis SMAs, TiNiCu narrow hysteresis SMAs, TiNiHf high temperature SMAs and TiNiRE SMAs were concisely reviewed. The damping characteristics and corresponding mechanisms of TiNi and TiNiNb alloys were described and discussed. Some surface modifications of TiNi binary alloys were employed to improve the corrosion resistance and the biocompatibility, which are very useful for the medical applications. Shape memory effect and mechanical properties of TiNiHf alloys were enhanced by aging Ni-rich TiNiHf alloys, while the Ms still remain enough high. The authors found that the addition of RE to TiNi alloys increases the phase transformation temperatures and even changes the transformation sequence. Fundamental research on the TiNi-based alloys is still in the ascendant, leading to increasingly extending of the applications.     

Pareto optimization of WEDM process parameters for machining a NiTi shape memory alloy using a combined approach of RSM and heat transfer search algorithm

Machining of shape memory alloys (SMAs) without losing the shape memory effect could immensely extend their applications.Herein,the wire electric discharge mach...     

Recent advances in shape memory polymers and composites: a review

Shape memory polymers (SMPs) belong to a class of smart polymers, which have drawn considerable research interest in last few years because of their applications in microelectromechanical systems, actuators, for self healing and health monitoring purposes, and in biomedical devices. Like in other fields of applications, SMP materials have been proved to be suitable substitutes to metallic ones because of their flexibility, biocompatibility and wide scope of modifications. The shape memory properties of SMPs polymers might surpass those of shape memory metallic alloys (SMAs). In addition to block copolymers, polymers blends and interpenetrating network structured SMP systems have been developed. The present review mainly highlights the recent progress in synthesis, characterization, evaluation, and proposed applications of SMPs and related composites.     

Crystal structures and shape-memory behaviour of NiTi

Shape-memory alloys (SMAs) are a unique class of metal alloys that after a large deformation can, on heating, recover their original shape. In the many practical applications of SMAs, the most commonly used material is NiTi (nitinol). A full atomic-level understanding of the shape-memory effect in NiTi is still lacking, a problem particularly relevant to ongoing work on scaling down shape-memory devices for use in micro-electromechanical systems. Here we present a first-principles density functional study of the structural energetics of NiTi. Surprisingly, we find that the reported B19' structure of NiTi is unstable relative to a base-centred orthorhombic structure that cannot store shape memory at the atomic level. However, the reported structure is stabilized by a wide range of applied or residual internal stresses. We propose that the memory is stored primarily at the micro-structural level: this eliminates the need for two separate mechanisms in describing the two-way shape-memory effect.     

Computing dynamics of copper-based SMA via centre manifold reduction of 3D models

In this work, we present a reduction procedure for 3D models describing phase transformations in copper-based shape memory alloys (SMAs) and develop a robust numerical algorithm for the computational analysis of thin single-crystal slabs of these alloys. Starting from a general Landau-type 3D model for the SMA dynamics we have developed a new mathematical “slow manifold” model that allows us to describe effectively the main features of the thermomechanical behaviour of CuAlNi alloys. Results of the mathematical modelling of the thermomechanical fields in CuAlNi SMAs are discussed with numerical examples.     

NiTi基形状记忆合金弹热效应及其应用研究进展

NiTi合金作为性能最优异的形状记忆合金之一,已经广泛应用于航空航天、电子、建筑、生物医学等领域。近年来,NiTi基合金极佳的力学性能、巨大的弹热效应和良好的机械加工性使其在弹热制冷领域引起了广泛关注。然而,传统NiTi二元合金超弹性应力滞后大,超弹性和弹热效应循环稳定性差,达不到实际应用所需的长期服役要求。本文介绍了NiTi基合金的弹热效应研究进展,从掺杂合金元素、热机械处理、改变制备方法等角度综述了近几年NiTi基合金弹热效应改进优化的研究进展,同时本文也简要介绍了已经开发的基于NiTi基合金的弹热装置或原型机。但是目前NiTi基合金弹热材料的研究和原型机的开发仍处于实验阶段,实现其商业化应用需要进一步深入研究和优化,未来前者研究重点将集中在材料小型化、合金化或特殊处理及改变循环方式等方面,后者也将从提高热量传输效率、加强热量交换、减小摩擦等损耗、改进机械负载和循环模式等方面不断优化和完善。     

Phase Transformation and Thermal Stability of Aged Ti-Ni-Hf High Temperature Shape Memory Alloys

The use of Ni-rich TiNiHf alloys as high temperature shape memory alloys （SMAs） through aging has been presented. For Ni-rich Ti80-xNixHf20 alloys, their phase transformation temperatures are averagely increased more than 100 K by aging at 823 K for 2 h. Especially for the alloys with Ni-content of 50.4 at. pct and 50.6 at. pct, their martensitic transformation start temperatures （Ms） are more than 473 K after aging. TEM observation confirmed that some fine particles precipitate from the matrix during aging. The aged Ni-rich TiNiHf SMAs show the better thermal stability of phase transformation temperatures than the solutiontreated TiNiHf alloys. The fine particles precipitated during aging should be responsible for the increase of phase transformation temperatures and its high stability.