Nanoindentation Study of Polycrystal Nb

Acta Metall Sin

2005, Vol. 41

Issue (7): 703-707 DOI:

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Nanoindentation Study of Polycrystal Nb

WANG Mingguang; ZHOU Zhimin; ZHANG Caibei

College of Science; Northeastern University; Shenyang 110006

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WANG Mingguang; ZHOU Zhimin; ZHANG Caibei. Nanoindentation Study of Polycrystal Nb. Acta Metall Sin, 2005, 41(7): 703-707 .

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Abstract Grain boundary hardening and slip transmission across grain boundary are two important aspects in deformation of materials. Using depth--sensing indentation, a pop--in phenomenon induced by grain boundaries has been observed in polycrystalline niobium. This phenomenon is about a sudden displacement jump observed near a grain boundary segment at a larger force than the initial elasto--plastic pop--in, which is observed not to be affected by grain boundary. The experimental results show that this pop--in effect has a close relationship with misorientations of the grain boundary. Further studies found that no evident change of grain boundary hardness was observed even though there existed grain boundary pop--in.

Key words: Polycrystal Nb nanoindentation hardness

Received: 11 October 2004

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