Ferromagnetic shape memory heusler alloys, such as nimnga and nimnx x in, sn. They permit high resolution and distributed actuation. This new type of material shows an interesting potential in the area of mechatronics due to its. Modeling the coupled strain and magnetization response of. It exhibits inverse magnetostrictive effect or villari.
View enhanced pdf access article on wiley online library html view download pdf for offline viewing. These two key elements enable the author to introduce the main features associated with the behavior of shapememory alloys smas, i. Design of ferromagnetic shape memory alloy composites masahiro kusaka and minoru taya. Shape memory alloys is explained in detail in this page. Shape memory alloy engineering introduces materials, mechanical, and aerospace engineers to shape memory alloys smas, providing a unique perspective that combines fundamental theory with new approaches to design and modeling of actual smas as compact and inexpensive actuators for use in aerospace and other applications. In this area, magnetic shape memory alloys msma are possible. These two key elements enable the author to introduce the main features associated with the behavior of shape memory alloys smas, i. The one or more fluid passageways are configured to provide fluid communication between an exterior of the base pipe and a central flowbore, and the shapememory alloy is configured to transition between an expanded state.
Apart from the theoretical challenge of understanding. A wide variety of magnetic shape memory alloy options are available to you, there are 69 suppliers who sells magnetic shape memory alloy on, mainly located in asia. Corrosion of shape memory and superelastic alloys uhligs. After introducing the main characteristics of the prototype of precise positioning system based on an msm alloy, this paper considers the problem of effectively.
Since the discovery of this effect in the nimnga system 5,6, which is based on twin boundary motion in ferromagnetic martensite phases, these materials have generated a. Magnetic and magnetomechanical properties of nimnga magnetic shape memory alloys ladislav straka. Co and in doped nimnga magnetic shape memory alloys. When an sma is cold, or below its transformation temperature, it has a very low yield strength and can be deformed quite easily into any new shapewhich it will retain. Therefore, msm alloys can be also activated thermally, like thermal shape memory alloys see, for instance, nickeltitanium alloys.
Magnetic and mechanical properties of fenicoti and nimnga magnetic shape memory alloys. Due to the unique combination of very large strain, high energy density and relatively high actuation frequencies magnetic shape memory alloys thus allow novel applications which are not possible with conventional adaptive materials. This article is concerned with the modeling of the magnetic shape memory alloy msma constitutive response caused by the reorientation of martensitic variants under mechanical and magnetic fields. Barman ugcdae consortium for scientific research, indore th 77 annual meeting of indian academy of sciences, november 1820, 2011, physical research laboratory, ahmedabad. The top countries of supplier is china, from which the percentage of magnetic shape memory alloy supply is 100% respectively. They belong to the family of socalled smart materials and are futuregeneration materials that are likely to be useful in cuttingedge technologies. Within the area a of the spp 1239 running since september 2006, the fundamentals of this material class are. In this study, the shape memory response of ni 2mnga and nimncoin magnetic shape memory alloys was observed under compressive stresses. Schiepp1 1eto magnetic gmbh, hardtring 8, 78333 stockach, germany 2university of applied science konstanz, brauneggerstrasse 55, 78462 konstanz, germany corresponding author. It may also be called memory metal, memory alloy, smart metal, smart alloy, or muscle wire. Barman ugcdae consortium for scientific research, indore th 77 annual meeting of indian academy of sciences, november 18. Shape memory alloys smas are the alloys that remember their shape and after deformation can return to the low temperature shape by heating and subsequent cooling. Magnetic shape memory alloy msma which is an alloy of nimnga. When an sma is cold, or below its transformation temperature, it has a very low yield strength and can be deformed quite easily into any new shape which it will retain.
Of particular interest is the associated nonlinear and hysteretic macroscopic strain response under variable applied magnetic field in the presence of stress, also known as the magnetic shape memory effect msme. In nimnga ferromagnetic shape memory alloys, codoping plays a major role in determining a peculiar phase diagram where, besides a change in the critical temperatures, a change of number, order and nature of phase transitions e. Large magnetic field induced strain shave been reported in ferromagnetic shape memory alloys. Pdf magnetic shape memory alloys as smart materials for. So far, several constitutive models have been proposed to predict ferromagnetic shape memory alloys behaviors under the application of a magnetic field and a compressive stress. The structural properties of products were characterized by xrd, field emission scanning electron microscopy fesem, optical microscopy om, atomic emission spectroscopy aes, and energydispersive spectroscopy eds. Characterization of nimnga magnetic shape memory alloys. Corrosion of shape memory and superelastic alloys uhlig. Magnetic shape memory effect of up to 6% elongation in a magnetic field. Identification of novel compositions of ferromagnetic. The one or more fluid passageways are configured to provide fluid communication between an exterior of the base pipe and a central flowbore, and the shape memory alloy is configured to transition between an expanded state and a compressed state in response to a trigger.
Advanced shape memory alloy material models for ansys 4 as shown in the table 1, the thermomechanical behavior of the sma model can be specified by 12 constants, 9 of which are shown figure 4. Us20140027108a1 expandable screen using magnetic shape. Magnetic shape memory and shape memory alloys other than titanium based. To examine the effect of microalloying with boron on microstructure, sem secondary electron micrographs for the ni 51. The quest for highquality single crystals and the associated costs are a major barrier for the commercialization of magnetic shapememory alloys.
Magnetic shape memory alloys msmas, also called ferromagnetic shape memory alloys fsma, are particular shape memory alloys which produce forces and deformations in response to a magnetic field. Introduction to sma smart or intelligent materials are materials that have to respond to stimuli and environmental changes and to activate their functions to these changes. Read characterization of nimnga magnetic shape memory alloys, journal of materials processing technology on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Simulation of magnetic shape memory actuators stress based approach schiepp et al. Modification of microstructure and shape of solid materials by an external magnetic field. This technology relates also to an actuator, sensor and harvester including msm element of this technology. Short overview magnetic shape memory alloys as a smart material magnetic shape memory effect magnetomechanical behaviour of magnetic shape memory alloys iterative magnetostatic fem. Since the discovery of this effect in the nimnga system 5,6, which is based on twin boundary motion in ferromagnetic.
Magnetic shape memory alloys msmas belong to the class of heusler materials. Currently, most of the highprecision devices use piezo electric materials such as pzt. Enhanced cyclability of elastocaloric effect in boron. Exploration of magnetic shape memory alloys in the nimnga ternary system 42. Grain boundaries hinder twin boundary motion in magnetic shapememory alloys and suppress magneticfieldinduced deformation in randomly textured polycrystalline material. Magnetic shape memory alloy introduction, properties and. Jan 15, 2014 properties of magnetic shape memory alloys.
The patented nimnga single crystal magnetic shape memory material from goodfellow has some incredibly innovative properties, including the following. In this area, magnetic shape memory alloys msma are possible candidates. Magnetic shape memory material alloys research materials. Smas have drawn significant attention and interest in recent years in a. Development of a quasistatic model of nimnga magnetic shape. The wellknown nimnbased magnetic shape memory alloys exhibit fascinating multicaloric effects including elastocaloric, magnetocaloric and barocaloric effects, but they are intrinsically brittle because of weak grain boundary cohesion, which results in poor cyclic stability of elastocaloric effect. Pdf ferromagnetic shape memory alloys fsma have the unique capability to exhibit the thermoelastic martensitic transformation. Two types of martensitic phase transformations in magnetic shape memory alloys by in. With this book readers will gain an understanding of the intrinsic. Application of image processing to track twin boundary motion in magnetic shape memory alloys adrian rothenbuhler, elisa h. Design of ferromagnetic shape memory alloy composites. This paper describes a precise positioning system based on magnetic shape memory alloys msmas.
Ni 2mnga is a magnetic shape memory alloy msma that has been shown to exhibit fully reversible, stressassisted magnetic field induced phase transformation mfipt in the i xphase. Ecently, ferromagnetic shape memory alloys fsmas attract strong attention. Presents a unified approach to the constitutive modeling of shape memory alloys that includes modeling of magnetic and high temperature shape memory alloys. Introduction to shape memory alloys shape memory alloys smas are novel materials which have the ability to return to a predetermined shape when heated.
Msmas have been widely investigated in the past decade due to their ability to demonstrate large magnetic field induced strain and higher frequency response than conventional shape memory alloys smas. Shape memory and superelasticity, volume 2, issue 4 springer. Magnetic shape memory effect up to 6% elongation in a magnetic field. Magnetic shape memory alloys magnetically induced martensite mim magnetically induced reorientation mir requirements for actuation exotic materials. Phenomenological modeling of ferromagnetic shape memory alloys. A well screen assembly for use in a wellbore comprises a base pipe comprising one or more fluid passageways, and a shapememory alloy disposed about the base pipe. Structural change in nifega magnetic shape memory alloys. Magnetic shape memory alloy introduction, properties and applications. A shape memory alloy is an alloy that can be deformed when cold but returns to its predeformed remembered shape when heated. Msm devices promise innovative applications working at frequencies not achievable by. Multiferroic shapememory alloys that exhibit both ferroelastic and ferromagnetic properties have recently attracted much attention. The stimuli like temperature, pressure, electric flow, magnetic flow, mechanical, etc can originate internally or externally. Magnetic shape memory msm alloys take a unique position within the class of smart materials due to their outstanding strain up to 10% obtained in a moderate magnetic field.
Design of ferromagnetic shape memory alloy composites masahiro kusaka and minoru taya department of mechanical engineering center for intelligent materials and systems university of washington box 352600, seattle, wa, 981952600, usa received april 17, 2003 revised september 12, 2003 abstract. These parameters can be determined from a unixial test in the pseudoelastic phase as well as a stresstemperature diagram. Ferromagnetic shape memory alloys are a type of shape memory alloys that exhibit inelastic strains when subjected to magnetic fields. The magnetically induced martensitic variant reorientation process under applied mechanical load in magnetic shape memory alloys msmas is considered. Position control for a magnetic shape memory actuator.
On the other hand, magnetic shape memory alloys msma may be used both as microactuators and displacementforce sensors or dampers 2,3. Provides a rigorous introduction to continuum mechanics and continuum thermodynamics as they relate to the development of shape memory alloy modeling. Smas offer a basis for ferromagnetic shape memory alloys fsma modeling. Polycrystalline nimnal magnetic shape memory msm bulk alloys were produced by shs from mechanically activated nimnal powder mixtures. A quasistatic model for nimnga magnetic shape memory alloy is. The mechanism responsible for the large strain of msm alloys is the socalled magnetically induced reorientation mir, and is sketched in the figure.
Shape memory alloy effect in addition to a shape change caused by the application of a magnetic field, an additional shape change is caused by temperature. Magnetic and mechanical properties of fenicoti and nimnga. Abstract in the field of micromechatronics, microrobotics and specially microfactories, active materials are used in most cases. Schiepp1 1eto magnetic gmbh, hardtring 8, 78333 stockach, germany 2university of applied science konstanz, brauneggerstrasse 55, 78462 konstanz, germany. The aim of this book is to understand and describe the martensitic phase transformation and the process of martensite platelet reorientation. Us10290405b2 magnetic shape memory alloys and specimens. Two types of martensitic phase transformations in magnetic. Large exchange bias in magnetic shape memory alloys by. Some unique properties, such as large nonlinear elastic behavior and low youngs. Magnetic shape memory alloys msmas are a kind of smart materials which are of great importance due. A shapememory alloy is an alloy that can be deformed when cold but returns to its predeformed remembered shape when heated. Dissertation for the degree of doctor of science in technology to be presented with due permission of the department of engineering physics and mathematics for public examination and debate in auditorium f1 at helsinki university of technology espoo, finland on the 15 th of june, 2007, at 12. Clearly, microalloying with a proper amount of boron is very effective in grain refinement. Magnetic shape memory alloys as smart materials for micro.
Shape memory alloys modeling and engineering applications. A single crystal of nimnga is shown to deformed by bending approximately six degrees under the influence of an applied field. The circle marks the compositions near the ni 2 mnga heusler composition. Magnetic shape memory alloys msma are a new class of materials, for which a strain of up to 10% can be achieved by application of an external magnetic field 4. Magnetic shape memory alloys as smart materials for micropositioning devices a. The thermal shape memory effect has been obtained in these materials, too. Gauthier2 1institut femtost umr 6174, ufcensmmutbmcnrs. Shape memory alloys an overview sciencedirect topics. A shapememory alloys sma, smart metal, memory metal, memory alloy, muscle wire, smart alloy are metal alloys that can be deformed at one temperature but when heated or cooled, return to their original shape the alloy appears to have a memory the most effective and widely used alloys are niti, cuznal, and. Shape memory alloys sma are functional materials which are predominantly used as actuators.
Presents a unified approach to the constitutive modeling of shape memory alloys that includes modeling. Optimization of automated crystal orientation mapping in a tem for ni 4 ti 3 precipitation in allround sma. Magnetic shape memory alloys as smart materials for micropositioning devices. Corrosion and electrochemical behavior of ni fe ga ti. Dissertation for the degree of doctor of science in technology to be presented with due permission of the department of engineering physics and mathematics for public examination and debate in auditorium f1 at helsinki university of technology espoo, finland on the 15 th of june. Nimnx x in, sn, sb alloys, another important ferromagnetic shape memory alloy family. In these alloys responsible for the shape memory effect is martensitic transformation mt in addition to the transition of magnetic orderdisorder 4,5. Application of image processing to track twin boundary.
Pdf magnetic shape memory alloy and actuator design. Magnetic shape memory alloys msmas, also called ferromagnetic shape memory alloys fsma, are particular shape memory alloys which produce forces and. Shape memory alloys a group of metallic alloys which shows the ability to return to their original shape or size i. Offstoichiometric ni2mnga ferromagnetic shape memory alloys undergo a martensitic transformation mt from the l21 cubic phase to a martensitic crystal lattice consisting, in the majority of cases, of a periodic stacking sequence of nearly closedpacked planes with periodicity of 5, 7 or 2 planes, denoted as 10m five layered.
1066 81 58 196 646 1006 110 496 538 1138 412 719 1417 167 757 512 180 270 1184 1316 967 1251 82 1267 826 966 98 13 1084 289 350 808 991