期刊
ACS NANO
卷 10, 期 7, 页码 6995-7007出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.6b02970
关键词
ultrafast laser; transient melting and resolidification; laser-induced lattice defects; growth twin; laser-induced periodic surface structures; high-frequency surface nanostructures
类别
资金
- LABEX MANUTECH-SISE of Universite de Lyon within program Investissements d'Avenir [ANR-10-LABX-0075, ANR-11-IDEX-0007]
- National Science Foundation (NSF) [CMMI-1301298, CMMI-1436775]
- NSF through the Extreme Science and Engineering Discovery Environment [TG-DMR110090]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1301298] Funding Source: National Science Foundation
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1436775] Funding Source: National Science Foundation
The structural changes generated in surface regions of single crystal Ni targets by femtosecond laser irradiation are investigated experimentally and computationally for laser fluences that, in the multipulse irradiation regime, produce sub-100 nm high spatial frequency surface structures. Detailed experimental characterization of the irradiated targets combining electron back scattered diffraction analysis with high-resolution transmission electron microscopy reveals the presence of multiple nanoscale twinned domains in the irradiated surface regions of single crystal targets with (111) surface orientation. Atomistic- and continuum-level simulations performed for experimental irradiation conditions reproduce the generation of twinned domains and establish the conditions leading to the formation of growth twin boundaries in the course of the fast transient melting and epitaxial regrowth of the surface regions of the irradiated targets. The observation of growth twins in the irradiated Ni(111) targets provides strong evidence of the role of surface melting and resolidification in the formation of high spatial frequency surface structures. This also suggests that the formation of twinned domains can be used as a sensitive measure of the levels of liquid undercooling achieved in short pulse laser processing of metals.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据