Indentation strain burst phenomenon induced by grain boundaries in niobium


Using depth-sensing indentation, a pop-in phenomenon induced by grain boundaries, namely, a sudden indenter displacement jump when indented near a grain boundary segment, was observed in polycrystalline niobium. This grain-boundary type of pop-in occurs at a larger force than the initial elasto-plastic pop-in, which is observed with and without a grain boundary nearby. The experimental results show that this pop-in effect has a close relationship with the misorientation across the grain boundary. The occurrence of this pop-in phenomenon is rationalized in terms of slip transmission across the grain boundary.

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Wang, M.G., Ngan, A.H.W. Indentation strain burst phenomenon induced by grain boundaries in niobium. Journal of Materials Research 19, 2478–2486 (2004).

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