Plastic Deformation of Electrodeposited Nanocrystalline Ni-W Alloys at High Temperatures

Abstract:

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High-strength nanocrystalline Ni-W alloys containing 16.9 at. % W with average grain size of about 6 nm in diameter has been obtained by electrodeposition. At room temperature, the nominal tensile strength of the alloy was attained to about 1600 MPa, while the plastic strain before fracture was a very low value of 0.05 %. In this case, highly localized shear bands were observed near the fractured surface of the tensile test specimen. When the samples were annealed at 300 °C under a static tensile stress of 327 MPa, the plastic strain was largely increased at the initial period of annealing and then tended to saturate, i.e., 0.54 % for 2 h, respectively. Grain size of the Ni-W alloys was almost saturated to 10 ~ 15 nm after annealing at 300°C for 2 h. It may be expected that the high tensile stress during grain growth might be effective to obtain the large uniform plastic deformation of nanocrystalline Ni-W alloys.

Info:

Periodical:

Materials Science Forum (Volumes 561-565)

Main Theme:

Edited by:

Young Won Chang, Nack J. Kim and Chong Soo Lee

Pages:

1295-1298

DOI:

10.4028/www.scientific.net/MSF.561-565.1295

Citation:

H. Yokoyama et al., "Plastic Deformation of Electrodeposited Nanocrystalline Ni-W Alloys at High Temperatures", Materials Science Forum, Vols. 561-565, pp. 1295-1298, 2007

Online since:

October 2007

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$35.00

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