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Materials 2017, 10(12), 1424; https://doi.org/10.3390/ma10121424

Multiscale Analyses of Surface Failure Mechanism of Single-Crystal Silicon during Micro-Milling Process

1
School of Mechanical and Electrical Engineering, Harbin Institute of Technology, Harbin 150001, China
2
Centre for Precision Technologies, University of Huddersfield, Huddersfield HD1 3DH, UK
*
Author to whom correspondence should be addressed.
Received: 1 November 2017 / Revised: 10 December 2017 / Accepted: 12 December 2017 / Published: 13 December 2017
(This article belongs to the Section Manufacturing Processes and Systems)
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Abstract

This article presents an experimental investigation on ductile-mode micro-milling of monocrystalline silicon using polycrystalline diamond (PCD) end mills. Experimental results indicate that the irregular fluctuation of cutting force always induces machined surface failure, even in ductile mode. The internal mechanism has not been investigated so far. The multiscale discrete dislocation plasticity framework was used to predict the dislocation structure and strain evolution under the discontinuous cutting process. The results showed that a mass of dislocations can be generated and affected in silicon crystal. The dislocation density, multiplication rate, and microstructure strongly depend on the milling conditions. In particular, transient impulse load can provide a great potential for material strength by forming dislocations entanglement structure. The continuous irregular cutting process can induce persistent slip bands (PSBs) in substrate surface, which would result in stress concentration and inhomogeneous deformation within grains. View Full-Text
Keywords: monocrystalline silicon; brittle material; surface failure behavior; discrete dislocation plasticity; crack monocrystalline silicon; brittle material; surface failure behavior; discrete dislocation plasticity; crack
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Bai, J.; Bai, Q.; Tong, Z. Multiscale Analyses of Surface Failure Mechanism of Single-Crystal Silicon during Micro-Milling Process. Materials 2017, 10, 1424.

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