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Search Results for shape memory effects
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Journal Articles
Direct Electrical Activation of the Shape Memory Effect
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AM&P Technical Articles (2021) 179 (3): 56–59.
Published: 01 April 2021
... zirconia-based shape memory ceramics httpsdoi.org/10.31399/asm.amp.2021-03.p056 56 FEATURE ADVANCED MATERIALS & PROCESSES | APRIL 2021 DIRECT ELECTRICAL ACTIVATION OF THE SHAPE MEMORY EFFECT New research explores a zirconia-based shape memory ceramic that exhibits a unique type of electrically triggered...
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View articletitled, Direct Electrical Activation of the <span class="search-highlight">Shape</span> <span class="search-highlight">Memory</span> <span class="search-highlight">Effect</span>
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for article titled, Direct Electrical Activation of the <span class="search-highlight">Shape</span> <span class="search-highlight">Memory</span> <span class="search-highlight">Effect</span>
New research explores a zirconia-based shape memory ceramic that exhibits a unique type of electrically triggered martensitic transformation.
Journal Articles
Prototype Progress Report: Elastocaloric Heat Pumps
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AM&P Technical Articles (2024) 182 (3): 49–52.
Published: 01 April 2024
...Jun Cui; Stefan Seelecke; Paul Motzki; Qingping Sun; Ichiro Takeuchi Both shape memory and elastocaloric effects are related to the reversible martensitic phase transformation. For the shape memory effect, thermal energy is used to drive the material through the phase transformation and recover its...
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View articletitled, Prototype Progress Report: Elastocaloric Heat Pumps
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for article titled, Prototype Progress Report: Elastocaloric Heat Pumps
Both shape memory and elastocaloric effects are related to the reversible martensitic phase transformation. For the shape memory effect, thermal energy is used to drive the material through the phase transformation and recover its original shape. For the elastocaloric effect, mechanical energy is used to induce phase transformation, and the associated latent heat is used to pump heat for cooling or heating. Heat pumps based on the elastocaloric effect have a low environmental impact and are highly efficient. However, designing a prototype to harvest the full potential of the elastocaloric effect has been challenging. This article summarizes prototyping efforts undertaken by three different research groups.
Journal Articles
NiTiHf Actuation Fatigue: How Much Do We Really Know?
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AM&P Technical Articles (2024) 182 (7): 42–46.
Published: 01 October 2024
... extensively studied hightemperature shape memory alloys (HTSMAs). exhaustive, this overview captures the major concepts influencing fatigue and failure mechanisms. Colored arrows denote well-studied factors with established effects on actuation fatigue and white arrows indicate topics that have been less...
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View articletitled, NiTiHf Actuation Fatigue: How Much Do We Really Know?
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for article titled, NiTiHf Actuation Fatigue: How Much Do We Really Know?
The NiTiHf alloy is one of the most extensively studied high-temperature shape memory alloys. This article reviews the key factors affecting the actuation fatigue performance of NiTiHf as well as the current state of research in this area, and it identifies some factors that require further study.
Journal Articles
Novel Shape Memory Alloy Nanowires
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AM&P Technical Articles (2013) 171 (2): 13–14.
Published: 01 February 2013
... a promising charac- teristic to achieve the shape memory effect on the Fig. 4 In situ heating of single 70-nm nanowires from RT (a) to 100°C (b), followed by cooling to RT (c). Reversible transformations are observed. A structural model of the nanowire is shown in (d), viewing along the [121] zone axis...
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View articletitled, Novel <span class="search-highlight">Shape</span> <span class="search-highlight">Memory</span> Alloy Nanowires
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for article titled, Novel <span class="search-highlight">Shape</span> <span class="search-highlight">Memory</span> Alloy Nanowires
Shape memory alloy nanowires have been successfully produced from indium-thallium, one of the least-studied binary SMAs. This article provides a brief overview of the process and some of the unique properties of the material. The article is based on the winning entry in the 2012 International Metallographic Contest sponsored by the International Metallographic Society.
Journal Articles
Shape Memory Alloy Enables Folding Wings in Flight
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AM&P Technical Articles (2018) 176 (2): 16–18.
Published: 01 February 2018
...-organizational collaboration and knowledge sharing. In recent years, CASMART activities have included publishing papers on SMA actuation design and modeling methods, identifying best practices for shape memory effect characterization, and exploring high-temperature SMAs, particularly the NiTiHf material system...
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View articletitled, <span class="search-highlight">Shape</span> <span class="search-highlight">Memory</span> Alloy Enables Folding Wings in Flight
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for article titled, <span class="search-highlight">Shape</span> <span class="search-highlight">Memory</span> Alloy Enables Folding Wings in Flight
The Spanwise Adaptive Wing project intends to obtain a wide spectrum of aerodynamic benefits in flight by folding wings through the use of an innovative and lightweight shape memory alloy.
Journal Articles
Dimensionally Stable Shape Memory Alloys for Mechanical Engineering Applications: The Other Side of Superelastics
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AM&P Technical Articles (2019) 177 (7): 43–47.
Published: 01 October 2019
... with bent wires made of equiatomic NiTi (known by its weight percent name NitinoI 55), the Buehler team observed that heating slightly above room temperature sometimes resulted in the wires returning to their original shape prior to bending. Buehler recognized this as a shape memory effect...
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View articletitled, Dimensionally Stable <span class="search-highlight">Shape</span> <span class="search-highlight">Memory</span> Alloys for Mechanical Engineering Applications: The Other Side of Superelastics
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for article titled, Dimensionally Stable <span class="search-highlight">Shape</span> <span class="search-highlight">Memory</span> Alloys for Mechanical Engineering Applications: The Other Side of Superelastics
Newly developed nickel-titanium (NiTi) alloys are well suited for bearings and gears in demanding applications.
Journal Articles
Tough Yet Flexible Superelastic Alloys Meet Biomedical Needs
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AM&P Technical Articles (2022) 180 (7): 35–37.
Published: 01 October 2022
... Featuring unique superelastic behavior, shape mem- memory effect[5]. In 2015, the team discovered a relatively ory alloys, specifically NiTi alloys, are widely used as self- inexpensive Co-Cr-Al-Si system with a chemical composition expanding vascular stents and orthopedic bone staples. Due to concerns...
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View articletitled, Tough Yet Flexible Superelastic Alloys Meet Biomedical Needs
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for article titled, Tough Yet Flexible Superelastic Alloys Meet Biomedical Needs
Novel bcc CoCr-base alloys exhibit a Young’s modulus similar to human bone combined with superelastic strain twice that of NiTi alloys.
Journal Articles
Quantitative Analysis of Phase Transformation in Ni-Ti Shape Memory Alloys
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AM&P Technical Articles (2013) 171 (4): 21–24.
Published: 01 April 2013
... of the observed area. Characterizing SMAs SMAs are metallic alloys that have unique properties, namely the shape memory effect and superelasticity, which make them wellsuited for use in a variety of advanced applications[8]. Both of these properties arise from a solid-to-solid, diffusionless phase transformation...
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View articletitled, Quantitative Analysis of Phase Transformation in Ni-Ti <span class="search-highlight">Shape</span> <span class="search-highlight">Memory</span> Alloys
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for article titled, Quantitative Analysis of Phase Transformation in Ni-Ti <span class="search-highlight">Shape</span> <span class="search-highlight">Memory</span> Alloys
Researchers at the University of Michigan are investigating the complex heterogeneous phase transformations associated with deformation in shape memory alloys by means of in-situ tensile loading in combination with SEM, EBSD, and digital image correlation. This article describes the general approach and presents and interprets test results.
Journal Articles
Shape Memory Alloy Actuated Vortex Generators
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AM&P Technical Articles (2020) 178 (3): 60–62.
Published: 01 April 2020
... shear loading: (a) temperature sensitivity as a function of stress, and (b) output shear strain as a function of stress. The solid symbols in (b) represent the two-way shape-memory effect after training. The transformation temperatures are indicated in the legend: martensite start (Ms), martensite...
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View articletitled, <span class="search-highlight">Shape</span> <span class="search-highlight">Memory</span> Alloy Actuated Vortex Generators
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for article titled, <span class="search-highlight">Shape</span> <span class="search-highlight">Memory</span> Alloy Actuated Vortex Generators
With the goal of improving aircraft efficiency, Boeing in collaboration with NASA Glenn Research Center (GRC) have developed and successfully flight tested environmentally activated vortex generators that passively, repeatedly, and accurately retract during cruise and deploy during take-off and landing phases. The capability discussed in this article is based upon recent advancements in shape memory alloy rotary-actuation technology, which included improved alloy systems, design tools, best practices, published standards, and previous wind tunnel and flight test demonstrations.
Journal Articles
Do Shape Memory Alloys Have Standards?
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AM&P Technical Articles (2025) 183 (2): 36–40.
Published: 01 March 2025
... application. Use cases in the medical industry FEATURE 39 ADVANCED MATERIALS & PROCESSES | MARCH 2025 predominantly utilize NiTi material for its superelasticity, defined as the material s elastic response to an applied stress. This is in stark contrast to the thermally induced shape memory effect utilized...
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View articletitled, Do <span class="search-highlight">Shape</span> <span class="search-highlight">Memory</span> Alloys Have Standards?
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for article titled, Do <span class="search-highlight">Shape</span> <span class="search-highlight">Memory</span> Alloys Have Standards?
A set of standardized material specifications and test methods now exists to evaluate and maintain quality in shape memory alloys used for medical devices and actuators. This article summarizes the ASTM standards applicable to shape memory technology in medical and actuation applications, and identifies areas requiring further standardization work.
Journal Articles
Fatigue Fracture of Nitinol
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AM&P Technical Articles (2021) 179 (7): 46–49.
Published: 01 October 2021
... as an initiation site for the fatigue crack in the wire-form component from Fig. 1. FEATURE In simple terms, the shape memory effect is exhibited when a phase transformation to martensite is thermally induced, deformed while in the martensitic state, and is then heated to revert it to its parent phase and shape...
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View articletitled, Fatigue Fracture of Nitinol
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for article titled, Fatigue Fracture of Nitinol
Nitinol fatigue fracture surfaces generally exhibit similar features to most engineering alloys, including a flat fracture plane, ratchet marks, radial lines, beachmarks, and striations.
Journal Articles
Shape Memory Polymer Technology and Its Medical Applications
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AM&P Technical Articles (2024) 182 (7): 38–41.
Published: 01 October 2024
...: 27419615, PMCID: PMC5508979. 3. S.M. Hasan, et al., Effects of Isophorone Diisocyanate on the Thermal and Mechanical Properties of Shape-Memory Polyurethane Foams, Macromol Chem Phys, 215(24), p 24202429, Dec 2014, doi.org/10.1002/macp.201400407, Epub Oct 30, 2014, PMID: 30220825, PMCID: PMC6136255. 4. S.M...
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View articletitled, <span class="search-highlight">Shape</span> <span class="search-highlight">Memory</span> Polymer Technology and Its Medical Applications
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for article titled, <span class="search-highlight">Shape</span> <span class="search-highlight">Memory</span> Polymer Technology and Its Medical Applications
With actuation capabilities that respond to temperature or light, the potential uses for shape memory polymers (SMPs) in the biomedical arena are on the rise. This article describes current and potential future uses of SMPs for medical devices.
Journal Articles
4D Printing of Metallic Functional Materials
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AM&P Technical Articles (2019) 177 (5): 16–21.
Published: 01 July 2019
... printing computational modeling functional materials laser powder bed fusion shape memory alloys A D V A N C E D M A T E R I A L S & P R O C E S S E S | J U L YA/DADUI TGIUVSETM2E0T1A9L S 1166 httpsdoi.org/10.31399/asm.amp.2019-05.p016 M4DEPRTINATLINLGIOCF FUNCTIONAL MATERIALS Kadri C. Atli, Luke...
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View articletitled, 4D Printing of Metallic Functional Materials
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for article titled, 4D Printing of Metallic Functional Materials
4D printing enables fabrication of complex objects that transform over time (the fourth dimension) when subjected to external stimuli. 4D printing of metallic functional materials is of special interest due to their capacity for self-assembly and multifunctionality, with the added benefit of higher actuation capability, in comparison with polymeric materials.
Journal Articles
A Need for New Standards: Communicating Shape Transformations in the Technical Documentation of Products
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AM&P Technical Articles (2023) 181 (7): 37–39.
Published: 01 October 2023
...; as well as blinds and shades in architectural applications. Taking a step further, research over the past decade has shown that shape memory materials can be effectively utilized with additive manufacturing processes to produce high-value products. 4D PRINTING Advances in additive manufacturing have...
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View articletitled, A Need for New Standards: Communicating <span class="search-highlight">Shape</span> Transformations in the Technical Documentation of Products
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for article titled, A Need for New Standards: Communicating <span class="search-highlight">Shape</span> Transformations in the Technical Documentation of Products
Advances in additive manufacturing have enabled functional grading and multi-material deposition to produce “4D printed” parts that are net or near net shape; creating highly complex features that are difficult to produce with conventional manufacturing processes. This article addresses the fundamental challenge of how to ensure that the design, manufacturing, and functional intent for 4D printed parts can be accurately and unambiguously communicated across the design, manufacturing, inspection, and supply value chain. The use case of a generic mini-gripper sheds light on the benefits that a new standard could bring to the engineering and design of shape memory materials.
Journal Articles
Selective Laser Processing for Functionally Graded Shape Memory Alloy Medical Devices: Process and Applications in Dentistry
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AM&P Technical Articles (2021) 179 (7): 41–45.
Published: 01 October 2021
... processing would be to locally decrease the stiffness. In shape memory actuation applications, the effect is a multi-stage actuation. The process has been described as Multiple Memory Material. The purpose of this article is to highlight recent applications of selective vaporization to enable functional...
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View articletitled, Selective Laser Processing for Functionally Graded <span class="search-highlight">Shape</span> <span class="search-highlight">Memory</span> Alloy Medical Devices: Process and Applications in Dentistry
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for article titled, Selective Laser Processing for Functionally Graded <span class="search-highlight">Shape</span> <span class="search-highlight">Memory</span> Alloy Medical Devices: Process and Applications in Dentistry
Novel methods for altering the mechanical properties of functionally graded orthodontic medical devices leads to new applications. This article highlights recent applications of selective vaporization to enable functional grading of shape memory alloys in medical devices for the dental industry.
Journal Articles
ASM News for April 2019
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AM&P Technical Articles (2019) 177 (3): 58–66.
Published: 01 April 2019
... Ph.D. in materials science from Carnegie-Mellon University. My interests in this field began in 1980 after accidentally discovering a shape memory effect in beta titanium alloys while working at Brown Boveri in Switzerland. While not terribly practical as a shape memory alloy, this spurred me...
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View articletitled, ASM News for April 2019
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for article titled, ASM News for April 2019
News about ASM members, chapters, events, awards, conferences, affiliates, and other society activities. Topics include: Ryan Deacon to chair 2019 ASM Nominating Committee; professional profile for Keerti S. Kappagantula; volunteer profile for Bob Vigneulle.
Journal Articles
Modulating the Pseudoelastic Response of NiTi Using Ion Implantation
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AM&P Technical Articles (2022) 180 (3): 49–53.
Published: 01 April 2022
.... I. Karaman, et al., The Effect of Severe Marforming on Shape Memory Characteristics of a Ti-rich NiTi Alloy Processed using Equal Channel Angular Extrusion, Metall. Mater. Trans. A., 34: 2527-2539, 2003. 13. H. Nakayama, et al., Crystal Refinement and Amorphisation by Cold Rolling in TiNi Shape...
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View articletitled, Modulating the Pseudoelastic Response of NiTi Using Ion Implantation
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for article titled, Modulating the Pseudoelastic Response of NiTi Using Ion Implantation
Ni-ion irradiated NiTi is nearly 50% harder, retains 85% recoverable deformation, and has reduced hysteresis. This work explores the feasibility of using ion beam modification to modulate the austenite to martensite phase transformation in NiTi, thereby achieving novel or localized properties in near-surface regions.
Journal Articles
Self-Healing Polymers Create Opportunities for Energy Applications
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AM&P Technical Articles (2020) 178 (4): 15–20.
Published: 01 May 2020
... of polymers is often accomplished by built-in shape-memory effect (SME), which relies on the ability of a polymer to close a wound using the energy stored during mechanical damage. Another approach disperses microspheres into a polymer matrix, which upon mechanical damage spills a healing agent to fill...
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View articletitled, Self-Healing Polymers Create Opportunities for Energy Applications
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for article titled, Self-Healing Polymers Create Opportunities for Energy Applications
Recent advances in the development of self-healing polymers enhance the longevity of energy harvesting and storage devices.
Journal Articles
ASM News for April 2024
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AM&P Technical Articles (2024) 182 (3): 61–66.
Published: 01 April 2024
..., and shape memory alloys. He rose to prominence in 1998 after publishing one of the first studies on the ferromagnetic shape memory effect, Magnetostriction of Martensite, which has been cited over 900 times. Wuttig was named to Stanford University s List of the World s Top 2% Scientists in 2021. ...
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View articletitled, ASM News for April 2024
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for article titled, ASM News for April 2024
News about ASM members, chapters, events, awards, conferences, affiliates, and other society activities. Topics include: Global Materials Platform PRO; updates from Interim Executive Director Carrie Wilson and Foundation Chair Julio Maldonado; emerging professionals symposium addresses mentorship; new course releases on Metal Additive Manufacturing of Thermal Processing; Gujarat Chapter holds pultrusion workshop; National Academy of Engineering honors ASM members; In memoriam for Günter Petzow.
Journal Articles
FDA Guidance on Medical Devices Containing Nitinol
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AM&P Technical Articles (2021) 179 (3): 52–55.
Published: 01 April 2021
....2020.104221, Epub Nov. 23, 2020. 16. S. Sivan, M. Di Prima, and J.D. Weaver, Effect of Applied Potential on Fatigue Life of Electropolished Nitinol Wires, Shape Memory and Superelasticity, Vol 3, No. 3, p 238-249, 2017. 17. G.M. Sena, et al., Larger Surface Area Can Reduce Nitinol Corrosion Resistance. npj...
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View articletitled, FDA Guidance on Medical Devices Containing Nitinol
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for article titled, FDA Guidance on Medical Devices Containing Nitinol
New FDA guidance for Nitinol used in medical devices includes clarification on the determination of safety factors, the requirements for corrosion testing, and proper labeling of potentially harmful elements.
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