Abstract

In this study, the effects of local heat treatment with fast pulse laser on thin TiNi shape memory alloy strip materials were investigated. Various materials characterization methods including optical microscope, scanning electron microscope, atomic force microscope, X-ray diffraction, differential scanning calorimetry, and Vickers hardness were used to identify the differences of microstructure, mechanical properties, and functional properties between regions inside and outside the laser-scanned region. The tensile test was also conducted for both the non-laser-scanned specimen and the laser-scanned specimen. The area covered by laser scanning shows great differences by possessing a more homogeneous austenite phase without shear bands and a higher elongation after tensile test up to the 600 MPa stress. In contrast, the non-laser-scanned region within the same alloy strip demonstrates shear band features and higher hardness. The results provide more possibilities for generating multi-sectional material properties within a single shape memory alloy thin part by high-speed pulse laser processing.

Department(s)

Mechanical and Aerospace Engineering

Comments

National Science Foundation, Grant CMMI 1625736

Keywords and Phrases

Laser heat treatment; Mechanical properties; Multifunctional materials; Phase transformation temperature; TiNi shape memory alloy

International Standard Serial Number (ISSN)

1433-3015; 0268-3768

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2025 Springer, All rights reserved.

Publication Date

01 Aug 2025

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