Article – Discussion of ‘‘Formation of an Intermediate Layer Between Grains in Nickel-Based Superalloy Turbine Blades’’

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JOHN CAMPBELL

Kim and Withey discuss the formation of an ‘intermediate layer’, formed between grains, which they observe in some Ni-base superalloys. This author proposes that the layer is the result of the presence of a bifilm, a double film probably of oxide or nitride, which appears to be capable of providing a coherent explanation of all the interesting observations reported by the authors.

 

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