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Shape Memory and Superelasticity OnlineFirst articles

Open Access 22-03-2024 | ORIGINAL RESEARCH ARTICLE

Evaluation of Thermomechanical Properties in a 2D Rotational Elastocaloric Prototype: A Numerical Study for Enhanced Energy Efficiency

So far, much of the research on the caloric effect has focused on the magnetocaloric effect, which was the first investigated chronologically, in the field of room temperature for about 40 years. Subsequently and especially in the last decade …

Authors:
Luca Cirillo, Adriana Greco, Claudia Masselli

22-03-2024 | ANNOUNCEMENT

Registration Is Now Open for SMST 2024!

Open Access 19-03-2024 | ORIGINAL RESEARCH ARTICLE

Atomistic Simulation of the Effect of H-Phase Precipitate on the Transformation Temperatures and Stress-Induced Phase Transformation in Ni-Rich NiTiHf

Precipitation hardening is considered the most feasible method for strengthening NiTiHf alloys. In order to design the optimum aging treatment to form precipitates, it is crucial to understand the effect of precipitates on the thermomechanical …

Authors:
Saeed Ataollahi, Mohammad J. Mahtabi

18-03-2024 | REVIEW

Early Efforts on Elastocaloric Cooling (2002 to 2014)

Common refrigerants used in vapor compression-based cooling technology, such as R410A, R22, and R134A, are greenhouse gases with warming potential exceeding 1400 times that of CO2. While cooling helps us survive the hot weather, these refrigerants …

Author:
Jun Cui

Open Access 13-03-2024 | REVIEW

Elastocaloric Effect in Shape-Memory Alloys

It is widely acknowledged that shape-memory alloys have an enormous potential for future developments of an environmentally friendly new solid-state refrigeration technology, thanks to their excellent elastocaloric properties. In the present …

Authors:
Lluís Mañosa, Antoni Planes

13-03-2024 | ORIGINAL RESEARCH ARTICLE

Shape Memory NiTiHf Machined Helical Springs: Balancing Displacement and Force Output for Actuation

NiTiHf shape memory alloys are of high interest to the scientific community due to their high strength, excellent stability, and high transformation temperature. While many geometrical forms can be manufactured using NiTiHf, traditional springs …

Authors:
P. E. Caltagirone, P. Naghipour Ghezeljeh, O. Benafan

Open Access 11-03-2024 | ORIGINAL RESEARCH ARTICLE

The Development of a 2D Numerical Model of a Device Using the Elastocaloric Effect to Cool Electronic Circuits

The scientific community has been working hard lately to develop fresh, environmentally friendly refrigeration technologies. Those based on solid-state refrigerants are among the Not-In-Kind Refrigeration Technologies that show great promises. The …

Authors:
Luca Cirillo, Adriana Greco, Claudia Masselli

12-02-2024 | ORIGINAL RESEARCH ARTICLE

Ultra-High Temperature Shape Memory Behavior in Ni–Ti–Hf Alloys

Shape memory behavior in stoichiometric Ni–Hf–Ti shape memory alloys with high Hf was evaluated. Five alloy compositions with a hafnium content from 30 to 50 at.% were arc melted, homogenized, and tested to reveal microstructure and shape memory …

Authors:
O. Benafan, G. S. Bigelow, A. Garg, L. G. Wilson, R. B. Rogers, E. J. Young-Dohe, D. F. Johnson, D. A. Scheiman, J. W. Lawson, Zhigang Wu

28-12-2023 | ORIGINAL RESEARCH ARTICLE

Effect of Post-treatments on the Thermomechanical Behavior of NiTiHf High-Temperature Shape Memory Alloy Fabricated with Laser Powder Bed Fusion

Despite increasing interest in Nickel Titanium-based high-temperature shape memory alloys (HTSMAs), machining challenges and limited functionality at elevated temperatures hinder their application in aerospace, energy, and automotive industries.

Authors:
Timothée Cullaz, Mohammadreza Nematollahi, Keyvan Safaei, Luc Saint-Sulpice, Laurent Pino, Saeedeh Vanaei, Parastoo Jamshidi, Moataz Attallah, Othmane Benafan, Shabnam Arbab Chirani, Mohammad Elahinia

12-12-2023 | ORIGINAL RESEARCH ARTICLE

Magnetic Field-Induced Martensitic Phase Transition in Cr-Substituted Ni–Mn–Sb + B Shape Memory Alloys

In this paper, the Ni50−yCryMn37Sb13 + B2 (y = 0, 3, 5 and 7) Heusler system was fabricated by the conventional arc-melting method. Samples with low Cr-content (y = 0 and 3) exhibited a mixed phase of 4O and 10 M at room temperature, while the …

Authors:
M. Ayyildiz, G. Kirat, M. A. Aksan

30-11-2023 | ORIGINAL RESEARCH ARTICLE

On the Impact of γ´ Precipitates on the Transformation Temperatures in Fe–Ni–Co–Al–Ti–B Shape Memory Alloy Wires

The effect of precipitation on the martensitic transformation temperatures of cold drawn Fe41–Ni28–Co17–Al11.5–Ti2.5-B0.05 (at. %) wires was studied. To promote the evolution of γ´ precipitates ageing at 600 °C, 650 °C and 700° for times varying …

Authors:
Juan Cassinerio, Maria Florencia Giordana, Eugenia Zelaya, Viktor Remich, Philipp Krooß, Jens Freudenberger, Thomas Niendorf, César E. Sobrero

20-11-2023 | REVIEW

A Brief Review on Discrete Modelling of Martensitic Phase Transformations

Most materials possess microstructural features at small length scales which are either stationary, such as grains and grain boundaries, phases and phase boundaries, precipitates, inclusions or mobile which tend to evolve during thermomechanical …

Authors:
Mahendaran Uchimali, P. Sittner

Open Access 30-10-2023 | ORIGINAL RESEARCH ARTICLE

Effects of Point Defects on the Monoclinic Angle of the B19″ Phase in NiTi-Based Shape Memory Alloys

This study investigated the effects of a variety of point defects on the monoclinic angle of the B19″ martensite in NiTi, including Ni and Ti vacancies, Ni–Ti anti-sites in the lattice, third element substitution, and Ni and Ti enrichments in the …

Authors:
Yingchao Li, Sam Bakhtiari, Hong Yang, Martin Saunders, Daqiang Jiang, Yinong Liu