Abstract
Two types of abnormal ripple patterns: classical ripples (C-ripples) with continuous ridges and unclassical ripples (U-ripples) with regular micropores were investigated in a Zr-based bulk metallic glass (Zr-BMG) after femtosecond laser beam irradiation. U-ripples with a period of \(\sim \)1,600 nm and the orientation nearly parallel to the polarization of laser beam were observed to form gradually on the top of C-ripples with the effective pulse number. Micropores created by the superposition of C-ripples and U-ripples had an average diameter of \(\sim \)750 nm nearly equal to the period of C-ripples (\(\sim \)720 nm) and ran along parallel lines in the grooves of U-ripples. Both U-ripples and C-ripples in Zr-BMG showed significant microstructural differences comparing with those in a conventional Zr-based alloy with the same composition and processing conditions, including much more regular and continuous ridges. The results indicate that the amorphous structure in Zr-BMG plays a key role in the uniform morphology of laser-induced structures.
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Acknowledgments
The financial supports provided by High Technology Research and Development Program of China (No.2007AA03A225), New Century Excellent Talents in University, Chinese Ministry of Education (Grant no.: NCET-06-0079), and the CAS/SAFEA International Partnership Program for Creative Research Teams are gratefully acknowledged.
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Zhang, W., Cheng, G., Hui, X.D. et al. Abnormal ripple patterns with enhanced regularity and continuity in a bulk metallic glass induced by femtosecond laser irradiation. Appl. Phys. A 115, 1451–1455 (2014). https://doi.org/10.1007/s00339-013-8062-z
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DOI: https://doi.org/10.1007/s00339-013-8062-z