Microhardness and microabrasion behaviour of NiTi shape memory alloy after femtosecond laser shock peening without coating in air

Hao Wang; Evgeny L. Gurevich; Andreas Ostendorf

doi:10.1117/12.2543550

2 March 2020 Microhardness and microabrasion behaviour of NiTi shape memory alloy after femtosecond laser shock peening without coating in air

Hao Wang, Evgeny L. Gurevich, Andreas Ostendorf

Author Affiliations +

Proceedings Volume 11273, High-Power Laser Materials Processing: Applications, Diagnostics, and Systems IX; 1127301 (2020) https://doi.org/10.1117/12.2543550
Event: SPIE LASE, 2020, San Francisco, California, United States

Abstract

The experiment study presents the influence of femtosecond laser shock peening (FsLSP) without a protective layer in the air on the surface hardness and surface mechanical property of NiTi shape memory alloy. Femtosecond laser shock peening is a new possibility of direct laser ablation without any protective layer under atmospheric conditions, which can produce intense shock waves with low pulse energy in the air. The average surface roughness values of the NiTi alloy samples were measured, because the surface roughness may affect its friction resistance. The results showed that the surface roughness of NiTi increased after femtosecond laser shock peening treatment. In comparison with the initial state, the coefficient of friction decreased and surface microhardness increased after femtosecond laser shock peening treatment with different FsLSP parameters. This improvement of wear properties may be attributed to the enhancement of surface microhardness and surface titanium oxide layer induced by the shock wave and laser ablation during FsLSP treatment.

Conference Presentation

Citation Download Citation

Hao Wang, Evgeny L. Gurevich, and Andreas Ostendorf "Microhardness and microabrasion behaviour of NiTi shape memory alloy after femtosecond laser shock peening without coating in air", Proc. SPIE 11273, High-Power Laser Materials Processing: Applications, Diagnostics, and Systems IX, 1127301 (2 March 2020); https://doi.org/10.1117/12.2543550

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