Abstract
In order to study the spallation phenomenon of titanium alloy under the shock of nanosecond laser, the Neodymium-Yttrium-Aluminum Garnet laser was used to carry out laser shock experiments on the surface of titanium alloy. By observing and measuring the surface morphology of the target material, the forming factors and the changes of the surface morphology under different parameter settings, the forming criteria of the titanium alloy were obtained. The results show that under the single variable method, the change of laser energy can affect the target shape variable, and there is a positive correlation between them. When the thickness was greater than or equal to 0.08 mm, no obvious cracks were found in the targets. Moreover, the number of impact times was the key factor for the target deformation; with the growth of impact times, the target deformation gradually became larger until the crack appeared. The larger the diameter of the spot, the more likely the target was to undergo plastic deformation. The surface of titanium alloy with a thickness of 0.08 mm appeared to rebound under specific laser shock condition. The changes in the back of the target material were observed in real time through a high-speed camera, and the plasma induced by the laser was observed in the process. This study is based on the results of previous studies to obtain the titanium alloy forming criteria, which provides a basis for the setting of laser parameters and the thickness of the target when the nanosecond laser impacts the Ti-6AL-4V target.
Highlights
It is considered that there may still be some shock waves at this time; when it is observed that the amount of water passing through the hole gradually decreases and presents a fixed value, the change in the deformation of the target material is related to the impact of the water flow instead of continuing to deform under the action of the remaining shock wave
The experimental results give a preliminary presentation of the forming criteria for titanium alloy sheets
It is concluded that the laser-induced plasma detonation wave impacts the material surface to achieve the purpose of plastic deformation
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Titanium alloy material is an important structural metal developed in the 1950s. The industrial production of titanium began in 1948, and the development of the aviation industry has led to rapid growth of the titanium industry. Countries are developing new low-cost and high-performance titanium alloys, and strive to have titanium alloys enter the civil industry with huge market potential. In this context, higher requirements are put forward for the research into titanium alloy processing technology
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