The corrosion behavior of high stiffness NiTiCo shape memory alloys was systematically investigated in the present study including straight wires, wire formed stents, and laser cut stents. It was found that the corrosion behavior of NiTiCo alloys is comparable to that of binary NiTi. This is attributed to the small amount of cobalt used in the ternary alloy. Additionally, the corrosion resistan...

In the field of micromechatronics, microrobotics and specially microfactories, active materials are used in most cases. They permit high resolution and distributed actuation. In this area, Magnetic Shape Memory Alloys (MSMA) are possible candidates. If a lot of studies deal with MSMA, only few applications use them until now. MSMA are attractive active materials because they have large strain (...

Large thermal hysteresis ( T hys ) is favorable in shape memory alloys (SMAs) because it renders wide service and storage temperature range of the SMA-made parts. In this letter, we show that large intrinsic up to 100 K achieved a low Nb content (2 at.%), β-Nb-free single-phase NiTiNb SMA fabricated by casting, forging, wire-drawing annealing. Such comparable widely used dual-phase SMAs which h...

A shape memory composite (SMC) was fabricated with a shape memory alloy (SMA) and a shape memory polymer (SMP), and its two-way bending deformation and recovery force were investigated. The results obtained can be summarized as follows: (1) two kinds of SMA tapes which show the shape memory effect (SME) and superelasticity (SE) were heat-treated to memorize the round shape. The shape-memorized ...

Shape Memory Alloys are capable of changing their crystallographic structure due to changes of temperature and/or stress. Our research focuses on three points: (1) Iterative Homogenization of Porous SMAs: Development of a Multiscale Model of porous SMAs utilizing iterative homogenization and based on existing knowledge of constitutive modeling of polycrystalline SMAs. (2) DDDAS: Develop tools t...

Remarks on the existence for the one{dimensional Fr emond model of shape memory alloys Abstract. In this paper we outline a rigorous proof of the existence of solutions to one{dimensional initial{boundary value problems for the general and complete version of the Fr emond thermo{ mechanical model applying to shape memory alloys.

For Micro-electro-mechanical System (MEMS) applications, TiNi-based thin film Shape Memory Alloys (SMAs) possess many desirable properties, such as high power density, large transformation stress and strain upon heating and cooling, superelasticity and biocompatibility. In this paper, recent development in TiNi-based thin film SMA and microactuator Thin film SMAs and microactuators 209 applicat...

The three-point-bending shape memory properties, microstructure, and magnetic properties of Fe40.95Ni28Co17Al11.5Ta2.5B0.05 (at.%) alloys were investigated. results showed a martensitic transformation in the samples that aged at 700 °C for 6 12 h under applied fields 0.05 7 Tesla. start temperature increased from −113 to −97 as aging times h. Increasing Tesla, temperatures higher temperature. B...

Abstract This paper presents a unified modelling effort to describe partial phase transformation during cyclic thermo-mechanical loading in Shape Memory Alloys (SMA). To this purpose, three-dimensional (3D) finite strain constitutive model considering TRansformation-Induced Plasticity (TRIP) is combined with modified hardening function enable the accurate and efficient prediction of transformat...