[Kovove materialy - Metallic materials]
    Thu - July 19, 2018 - 08:09 No. of hits : 944747 ISSN 1338-4252 (online) ISSN 0023-432X (printed)
© Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Bratislava, Slovak Republic

VOLUME 49 (2011), Issue 1

Microstructural stability and nanoindentation of an electrodeposited nanocrystalline Ni-1.5 wt. % P alloy
PRASAD, M. J. N. V., CHOKSHI, A. H.
vol. 49 (2011), no. 1, pp. 93 - 99

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.

Key words
nanocrystalline, nickel, nanoindentation, Hall-Petch relationship, grain boundary weakening

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Full title of this journal is bilingual: Kovové materiály - Metallic Materials.
The official abbreviation in accordance with JCR ISI is Kovove Mater.


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