Research on the transient forming process and high-temperature stability mechanism of warm laser shock imprinting

Laser shock imprinting (LSI) technology has attracted more and more researchers' interest in the fabrication of high-precision three-dimensional (3D) microstructures. These researchers found that LSI technology can improve the depth, accuracy, and mechanical properties of the formed parts. However, they also found that when the formed parts made of LSI are used in high temperature environment, the formed parts are easy to return to their initial state, which greatly limits the application of 3D microstructure and LSI technology. Therefore, it is very important to improve the accuracy and stability of microstructure and realize the rapid manufacturing of formed parts. Therefore, we use temperature-assisted laser shock imprinting (TALSI) technology to solve these problems. In addition, there have been many studies on the strengthening mechanism of hardness, tensile and fatigue properties of LSI technology, but there is still a blank in the research on its high temperature stability and strengthening mechanism. In this study, warm laser shock imprinting (WLSI) experiments were carried out, followed by high-temperature recovery experiments, and the stress and strain distributions were studied by numerical simulation. Then, the surface morphology, mechanical properties of the laser impact samples were tested and characterized by 3D optical profiler and scanning electron microscope (SEM), as a result, the effects of temperature on the plasticity, flow stress, dynamic yield strength and deformation springback of aluminum foil are obtained. In addition, the microstructure evolution of aluminum foil before and after WLSI treatment was characterized by transmission electron microscope (TEM) and electron backscatter diffraction (EBSD) technology, and the deformation mechanism and high temperature stability mechanism of WLSI were obtained. It is of great significance to understand the forming/strengthening mechanism of laser shock technology and the development of LSI technology in the future.

Automated summary

Researchers have shown increasing interest in laser shock imprinting (LSI) technology for high-precision 3D microstructure fabrication, but have encountered limitations when using LSI parts in high temperature environments. To address this issue, temperature-assisted laser shock imprinting (TALSI) technology was explored, and experiments were conducted to study the effects of temperature on the mechanical properties of aluminum foil. Further research is needed on the high temperature stability and strengthening mechanisms of LSI technology.