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Microstructural stability and nanoindentation of an electrodeposited nanocrystalline Ni-1.5wt.%P alloy

Prasad, MJNV and Chokshi, AH (2011) Microstructural stability and nanoindentation of an electrodeposited nanocrystalline Ni-1.5wt.%P alloy. In: Kovové materiály / Metallic Materials, 49 (1). pp. 93-99.

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Official URL: http://www.kovmat.sav.sk/abstract.php?rr=49&cc=1&s...

Abstract

Microstructural stability of nanocrystalline Ni-1.5wt.%P alloy with an initial grain size of 3 nm processed by pulsed electrodeposition was studied using differential scanning calorimetry (DSC) and annealing. Microstructural characterization suggests that the observed exothermic peak during heating in DSC is related to both concurrent grain growth and Ni3P formation. Nanoindentation on samples with grain sizes from 3 to 50 nm revealed a breakdown in Hall-Petch strengthening in nano Ni-P alloy at grain sizes <= 10 nm, consistent with some previous observations. It is concluded that there is a grain boundary weakening regime for grain sizes < 10 nm, based on analysis which show that the data cannot be rationalized in terms of microstrain relaxation, variation in elastic modulus, texture evolution and duplex structure formation.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Academic Electronic Press.
Keywords: nanocrystalline;nickel;nanoindentation;Hall-Petch relationship;grain boundary weakening
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 20 May 2011 06:52
Last Modified: 20 May 2011 06:52
URI: http://eprints.iisc.ernet.in/id/eprint/37674

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