PSI - Issue 81

Available online at www.sciencedirect.com

ScienceDirect

Procedia Structural Integrity 81 (2026) 31–34

© 2026 The Authors. Copy from the contract: Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2025 organizers Keywords: laser; laser processing; mechanical properties; shape memory alloys; superelasticity 1. Introduction Shape memory alloys are materials that exhibit unique physical, mechanical, and functional properties due to their structure. They are used in medicine, the aerospace industry, robotics and mechanical engineering. One of the modern methods of changing the structure and properties of materials is laser processing. During such processing, extreme temperatures and pressures are created in the irradiation zone, which allows to obtain a structure in the near-surface layer that differs from the structure of the base material, and this directly affects the properties of the material. Laser processing has a number of advantages over traditional processing methods: high accuracy, ease of automation and high controllability of the processing. Abstract Shape memory alloys have a number of unique physical properties, which is why they are used in various fields of science and technology, especially in medicine and the aerospace industry. One of the modern methods of changing the structure and properties of materials is laser processing. It has several advantages over traditional methods: accuracy, ease of automation, and ease of process control. During nanosecond laser processing, the structure of the near-surface layers changes due to ultrafast heating and cooling, and the changes are also influenced by the plasma pressure and the recoil momentum of the ablation products. As a result of these processes, the near-surface layer has a unique structure and properties that differ from the structure and properties of the base material. In this work, the effect of nanosecond laser processing using an Nd: YAG laser on the surface of superelastic nitinol was investigated. Comparison of the static tensile curves of nitinol before and after laser processing showed a decrease in the relative elongation of the samples by approximately 10%, and the ultimate tensile strength decreased by approximately 8%. The study of the surface of the samples before and after laser treatment, after static tensile testing, showed the appearance of a large number of microcracks. Fracture fractograms showed that the crack during static tensile testing is formed on the surface, both in the treated and untreated samples, and propagates into the material. Changes in the structure and properties are explained by the change in the amount of martensite in the near-surface layers after laser treatment. VIII International Conference “In - service Damage of Materials: Diagnostics and Prediction“ (DMDP 2025) Effect of nanosecond laser processing on the structure and mechanical properties of superelastic shape memory alloys Vitalii Mocharskyi a , *, Volodymyr Iasnii a , Andrii Sorochak a , Udo Behn b , Harshil Mistry b , Christian Rödel b a Ternopil Ivan Puluj National Technical University, Ruska Street 56, 46001 Ternopil, Ukraine b Schmalkalden University of Applied Sciences, Blechhammer 6-9, 98574 Schmalkalden, Germany

* Corresponding author. Tel.: +380-97-163-85-01. E-mail address: vitaliimocharskyi@gmail.com

2452-3216 © 2026 The Authors. Copy from the contract: Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2025 organizers 10.1016/j.prostr.2026.03.006