Influence of applied stress on shape memory characteristics of Ni50Ti45Cu5 (at.%) alloy subjected to thermomechanical cycling

IF 2.5 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications Pub Date : 2024-02-21 DOI:10.1177/14644207241232900

Swaminathan Ganesan, Sampath Vedamanickam, Adarsh Sorekunte Huchappa

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引用次数: 0

Abstract

Shape memory alloys have made rapid progress in many domains, primarily biomedical (endovascular stents, orthodontic archwires), and engineering (smart actuators, robotics, hydraulic couplings). The selection of a shape memory alloy for the indented application is based on its characteristic phase transformation temperatures. These characteristic temperatures are influenced by myriad parameters, such as composition, microstructure of the alloy, defect density, etc. When an shape memory alloy under an external load is subjected to cyclic operations to perform useful work, for example, actuators, these characteristic temperatures are modified. This study, therefore, aims to understand the influence of external loading on the shape memory characteristics of a Ni50Ti45Cu5 (at.%) alloy. A wire of 1.43 mm diameter and length of 100 mm was subjected to heating and cooling between its phase transformation temperatures in a cyclic manner under constant stress (of up to 60 MPa). The maximum recovery strain, actuation/retraction rate, and the stress influence coefficient were determined and compared with those of the other Ni-Ti and Cu-based shape memory alloys. The results show that raising the load level causes an increase in the transition temperatures, especially the Ms (martensite start temperature) rather than the other phase transformation temperatures (martensite finish (Mf), austenite start (As), austenite finish (Af)). It also significantly affects the recovery strain and the rate of retraction during forward transformation and the symmetry of operation.

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外加应力对热机械循环条件下 Ni50Ti45Cu5（at.%）合金形状记忆特性的影响

形状记忆合金在许多领域都取得了快速发展，主要是生物医学（血管内支架、正畸弓丝）和工程学（智能致动器、机器人、液压耦合器）。根据形状记忆合金的相变特征温度来选择适合缩进应用的形状记忆合金。这些特征温度受许多参数的影响，如合金的成分、微观结构、缺陷密度等。当形状记忆合金在外部载荷作用下进行循环操作以执行有用功（例如执行器）时，这些特征温度就会发生变化。因此，本研究旨在了解外部负载对 Ni50Ti45Cu5（at.%）合金形状记忆特性的影响。在恒定应力（高达 60 兆帕）条件下，对直径为 1.43 毫米、长度为 100 毫米的金属丝在其相变温度之间进行循环加热和冷却。测定了最大恢复应变、致动/回缩率和应力影响系数，并与其他镍钛和铜基形状记忆合金进行了比较。结果表明，提高载荷水平会导致转变温度升高，尤其是马氏体起始温度（Ms），而不是其他相变温度（马氏体结束温度（Mf）、奥氏体起始温度（As）、奥氏体结束温度（Af））。它还会对正向转变过程中的恢复应变和回缩率以及操作的对称性产生重大影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 工程技术-材料科学：综合

CiteScore

4.70

自引率

8.30%

发文量

166

审稿时长

3 months

期刊介绍： The Journal of Materials: Design and Applications covers the usage and design of materials for application in an engineering context. The materials covered include metals, ceramics, and composites, as well as engineering polymers. "The Journal of Materials Design and Applications is dedicated to publishing papers of the highest quality, in a timely fashion, covering a variety of important areas in materials technology. The Journal''s publishers have a wealth of publishing expertise and ensure that authors are given exemplary service. Every attention is given to publishing the papers as quickly as possible. The Journal has an excellent international reputation, with a corresponding international Editorial Board from a large number of different materials areas and disciplines advising the Editor." Professor Bill Banks - University of Strathclyde, UK This journal is a member of the Committee on Publication Ethics (COPE).