|
|||||
|
|
Abrupt transition from wavelength structure to subwavelength structure in a single-crystal superalloy induced by femtosecond laser |
|
| Authors: | Wei Zhang Guanghua ChengQiang Feng Lamei CaoFengping Wang Rongqing Hui |
| Affiliation: | a State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China b State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi’an Shaanxi 710119, China c National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China d National Key Laboratory of Science and Technology on Advanced High Temperature Structural Materials, Beijing Institute of Aeronautical Materials, Beijing 100095, China e Applied Science School, University of Science and Technology Beijing, Beijing 100083, China f Department of Electrical Engineering and Computer Science, University of Kansas, Lawrence, KS 66044, USA |
| Abstract: | The abrupt transition from low-spatial-frequency laser-induced periodic surface structure (LSFL) to high-spatial-frequency laser-induced periodic surface structure (HSFL) in single-crystal superalloy CMSX-4 during femtosecond laser irradiation has been reported. Microstructural investigations indicate that the transition was initiated by the generation of new grooves on the main ridges of LSFL ripples. This transition resulted in the period of HSFL nearly equal to half of LSFL period. Furthermore, the relationship between both LSFL and HSFL and their parametric dependence was established. The microstructural observation of the abrupt transition provides a morphological evidence of second harmonic generation being responsible for the formation of HSFL. |
| Keywords: | Femtosecond laser Microstructure Abrupt transition Second harmonic generation |
| 本文献已被 ScienceDirect 等数据库收录！ | |