Formation of linked nanostructure-textured mound-shaped microstructures on stainless steel surface via femtosecond laser ablation
Formation of linked nanostructure-textured mound-shaped microstructures on stainless steel surface via femtosecond laser ablation
复制标题
通过飞秒激光烧蚀在不锈钢表面形成链接的纳米结构-纹理丘状微结构
DOI：
10.1016/j.apsusc.2014.11.035
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发表时间：
2015-01-01
影响因子：
6.7
通讯作者：
Tsai, Hai-Lung
中科院分区：
文献类型：
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作者：
Li, Yingqi;Cui, Zeqin;Tsai, Hai-Lung
利用飞秒激光在空气中通过多次光栅扫描在AISI 443不锈钢表面诱导形成了纳米结构织构的丘状微结构（称为N丘）。本文讨论了N-丘的形成机理。随着光栅扫描次数的增加，识别出了连接的N丘形成的四个阶段。首先，飞秒激光诱导的周期性表面结构（FLIPSSs）上的不锈钢表面上产生。由于激光能量的空间分布不均匀，FLIPSS表面形貌发生改变，从而在FLIPSS上产生了前体突起。进一步增加光栅扫描次数，由于几何效应导致的优先烧蚀，前驱突起将生长成随机分布的N丘。最后，随着N丘的生长减小N丘之间的谷的宽度，连接的N丘逐渐形成。一旦形成连接的N丘，表面形态将不会随着光栅扫描次数的增加而显著改变。此外，N-丘覆盖着同心波纹和不规则的纳米结构作为烧蚀材料的再沉积的结果，这也是为什么连接的N-丘上升以上的表面在第三阶段中形成的原因。(C)2014爱思唯尔有限公司版权所有。
Linked nanostructure-textured mound-shaped microstructures (termed N-mounds) were induced by femtosecond laser on AISI 443 stainless steel surface in air via multiple raster scans. The formation mechanism of the linked N-mounds is discussed in this paper. With increasing number of raster scans, four stages of the linked N-mounds' formation are identified. First, femtosecond laser-induced periodic surface structures (FLIPSSs) are produced on the stainless steel surface. Then precursor protrusions are generated on the FLIPSSs because of unhomogeneous spatial distribution of laser energy caused by modifications of surface morphology. Further increasing the number of raster scans, precursor protrusions will grow into randomly distributed N-mounds owing to preferential ablation resulted from geometric effect. Finally, linked N-mounds gradually form as N-mounds' growth reduces the width of the valleys between N-mounds. Surface morphology will not change significantly with increasing number of raster scans once the linked N-mounds are formed. Besides, the N-mounds are covered with concentric ripples and irregular nanostructures as a result of redeposition of ablated materials which is also the reason why the linked N-mounds rise above the surface formed in the third stage. (C) 2014 Elsevier B.V. All rights reserved.