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Controlled crack growth in a WC-Co hardmetal has been observed in-situ in the SEM using an ultra-stiff test rig to allow controlled application and removal of loads. Cracks were observed to propagate in jumps of between 20μm and 70μm with each jump occurring in less than 200ms. High resolution SEM images and EBSD mapping have been used to characterise the effects of microstructure and WC grain orientation...
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