Strain-rate sensitivity of hardness of nanocrystalline Ni75at.%Al25at.% alloy film

Alfonso Ngan, J B Pethica, Hoi-Pang Ng

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Room-temperature indentation experiments carried out on nanocrystalline Ni75at.%Al25at.% alloy films with a range of grain sizes revealed that the strain-rate sensitivity of hardness is nearly zero and that the hardness increases as grain size decreases. The strain-rate insensitivity of hardness indicates that the room-temperature strength of these alloy films is dominated by an athermal, strain-rate-insensitive component. The hardness of the films was found to be in the range of 2.4 to 3.3 GPa, depending on grain size.
Original languageEnglish
Pages (from-to)382 - 386
Number of pages5
JournalJournal of Materials Research
Issue number2
Publication statusPublished - 2003
Externally publishedYes

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