Using Digital Image Correlation on SEM Images of Strain Field after Ion Beam Milling for the Residual Stress Measurement of Thin Films

The residual stress of thin films during the deposition process can cause the components to have unpredictable deformation and damage, which could affect the service life and reliability of the microsystems. Developing an accurate and reliable method for measuring the residual stress of thin films a...

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Bibliographic Details
Published in:Materials 2020-03, Vol.13 (6), p.1291
Main Authors: Chen, Terry Yuan-Fang, Chou, Yun-Chia, Wang, Zhao-Ying, Lin, Wen-Yen, Lin, Ming-Tzer
Format: Article
Language:English
Subjects:
Accuracy
Anisotropy
Coring
Deformation
Digital imaging
Ion beams
Lattice strain
Preferred orientation
Residual stress
Scanning electron microscopy
Service life
Stress measurement
Stress state
Thin films
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Summary:The residual stress of thin films during the deposition process can cause the components to have unpredictable deformation and damage, which could affect the service life and reliability of the microsystems. Developing an accurate and reliable method for measuring the residual stress of thin films at the micrometer and nanometer scale is a great challenge. To analyze the residual stress regarding factors such as the mechanical anisotropy and preferred orientation of the materials, information related to the in-depth lattice strain function is required when calculating the depth profiles of the residual strain. For depth-resolved measurements of residual stress, it is strategically advantageous to develop a measurement procedure that is microstructurally independent. Here, by performing an incremental focused ion beam (FIB) ring-core drilling experiment with various depth steps, the digital image correlation (DIC) of the specimen images was obtained. The feasibility of DIC to FIB images was evaluated after the translation test, and an appropriate procedure for reliable results was established. Furthermore, the condition of the film in the function of residual stress was assessed and compared to elucidate the applicability of this technology.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma13061291