ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
High-strength nanocrystalline Ni-W alloys containing 16.9 at. % W with average grain sizeof about 6 nm in diameter has been obtained by electrodeposition. At room temperature, the nominaltensile strength of the alloy was attained to about 1600 MPa, while the plastic strain before fracturewas a very low value of 0.05 %. In this case, highly localized shear bands were observed near thefractured surface of the tensile test specimen. When the samples were annealed at 300 °C under astatic tensile stress of 327 MPa, the plastic strain was largely increased at the initial period ofannealing and then tended to saturate, i.e., 0.54 % for 2 h, respectively. Grain size of the Ni-W alloyswas almost saturated to 10 ~ 15 nm after annealing at 300°C for 2 h. It may be expected that the hightensile stress during grain growth might be effective to obtain the large uniform plastic deformation ofnanocrystalline Ni-W alloys
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.1295.pdf
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