Work

Fatigue Resistance Improvement in Cold-Drawn NiTi Wires Treated with ALD: A Preliminary Investigation

Year: 2025

Type: article

Abstract: NiTi shape memory alloys (SMAs) are widely studied for their potential applications, and atomic layer deposition (ALD) is an effective technique for coating them due to its precise control over coating thickness. This study investigates the impact of Al2O3 coating on the fatigue behavior of cold-drawn NiTi wires with a 0.125 mm diameter. The wires were coated using atomic layer deposition (ALD) with 100 ALD cycles. Fatigue tests were conducted in tensile mode at room temperature, applying cyclic loading between 0–50, and 700 MPa (700 MPa is almost 40% of ultimate tensile strength). The results show that the cold-drawn NiTi wires failed after an average of 7500 tensile loading cycles, while the lifetime of the coated and stretched NiTi wires with a preload of 1.7–2.8 kg significantly improved, with an average of 293,000 cycles before failure.

Source: Applied Sciences

DOI: 10.3390/app15041823

Authors: David Vokoun, Ondřej Tyc, Sneha Manjaree Samal, Ivo Stachiv, Yoshane Yu, Chichung Kei

Institutions: Czech Academy of Sciences, FZU - Institute of Physics of the Czech Academy of Sciences, National Institutes of Applied Research, National Center for Instrumentation Research

Language: English

Topic: Shape Memory Alloy Transformations

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,896

Funders: European Commission, Ministerstvo Školství, Mládeže a Tělovýchovy, Grantová Agentura České Republiky, Akademie Věd České Republiky