Studies on artefacts induced in the specimen preparation routines of electron microscopy characterization

International Conference on Advances in Materials and Manufacturing Applications 2016

Monikandan, V.V.^1 ; Joseph, M.A.^1 ; Rajendrakumar, P.K.^1

Department of Mechanical Engineering, National Institute of Technology, Calicut, Kerala

673601, India^1

关键词: Amorphous layer;    Femtosecond laser machining;    Focused ion beam milling;    Hybrid composites;    Micro-structural characteristics;    Microscopic characterization;    Resolidification;    Ultra-microtomy;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/149/1/012016/pdf
DOI  :  10.1088/1757-899X/149/1/012016

来源: IOP

【 摘 要 】

Artefacts are induced during the preparation of specimens for electron microscopic characterization. The present work is a study of the artefacts induced on worn surfaces and wear debris specimens of AA6061-B4C-Gr hybrid composites. The worn surfaces are prepared using routines such as Focused Ion Beam (FIB) milling and ion milling. Apart from these routines, a novel trial is made to prepare the worn surface using femtosecond laser machining. The wear debris is pelletized and sectioned using ultramicrotome. In femtosecond laser machining, FIB milling and ion milling operations, melting and re-solidification of ablated debris, re-deposition and melting of sputtered debris and formation of the amorphous layer, respectively are the major artefacts that diminish the accuracy of the inferences made on the microstructural characteristics of the specimen. In ultramicrotomy, knife marks, tearing of sections and absence of wear debris distribution reduce the effectiveness of the routine, making it impossible to derive any substantial inference from the micrographs.