Micro-mechanical measurements of fracture toughness of bismuth embrittled copper grain boundaries |
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| Authors: | D.E.J. Armstrong A.J. Wilkinson S.G. Roberts |
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| Affiliation: | 1. Department of Materials , University of Oxford , Oxford, UK david.armstrong@materials.ox.ac.uk;3. Department of Materials , University of Oxford , Oxford, UK |
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| Abstract: | Measuring the fracture properties of single grain boundaries has until now required macroscopic bi-crystals which are expensive and not always available. We describe a method for fracture testing using micro-cantilevers, manufactured using focussed ion beam machining and tested using a nanoindenter. We have used the method to measure the fracture toughness of selected grain boundaries in bismuth-embrittled copper. This technique is applicable to grain boundaries in other brittle polycrystalline samples for which large bi-crystals cannot be produced for conventional testing. |
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| Keywords: | fracture toughness grain boundaries embrittlement focussed ion beam nanoindentation |
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