Discussion on “Interfacial Residual Stress Analysis of Thermal Spray Coatings by Miniature Ring-Core Cutting Combined with DIC Method”

The purpose of this discussion is to point out some similarities between a paper that was recently published by J.G. Zhu et al. [1] and a paper that we published earlier on the same subject [2]. The micro-scale FIB-DIC ring core technique was first proposed in 2009 [3]. The attraction of this method lies in its compatibility with well-established experimental facilities and interpretation procedures, and its applicability to stiff and compliant, crystalline and amorphous materials alike. The technique utilizes a combination of material removal and imaging capabilities of focused ion beam and dual-beam microscopes. This allows highly spatially resolved residual stress measurements to be performed with sub-micron lateral spatial resolution [4] and depth profiling with a resolution of ~100 nm [2].