The effect of solid solution W additions on the mechanical properties of nanocrystalline Ni |
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Affiliation: | 1. International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Hyderabad 500 005, India;2. School of Chemistry and Physics, Queensland University of Technology (QUT), Brisbane QLD 4001, Australia;1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, PR China;2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, PR China;3. Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials Science and Engineering, Northeastern University, 3-11 Wenhua Road, Shenyang 110819, PR China;1. Department of Chemical Engineering and Materials Science, University of California, Irvine, CA 92697, USA;2. Department of Mechanical and Aerospace Engineering, University of California, Irvine, CA 92697, USA |
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Abstract: | Although pure metals with grain sizes below about 10 nm are very difficult to prepare, alloying enables the realization of finer grain sizes, often down to the amorphous limit. In this work, the role of solid solution additions of ~13 at% W are considered with respect to the structure and mechanical properties of electrodeposited Ni alloys with grain sizes below 10 nm. Structure of the nanocrystalline alloys is analyzed by high-resolution transmission electron microscopy, and related to the mechanical properties assessed by instrumented nanoindentation and nano-scratch experiments. The Ni-W alloys exhibit higher hardness and scratch resistance as compared to the finest pure nanocrystalline Ni alloys, although the contribution of solid solution strengthening from W is expected to be essentially negligible. The improved properties are therefore most likely due to the finer length scale available in multicomponent nanocrystalline alloys, and suggest that alloying may suppress the breakdown of Hall-Petch strengthening to finer grain sizes. Finally, the present data are shown to smoothly bridge the hardness-grain size trend between nanocrystalline Ni (grain size>10 nm) and amorphous Ni-based alloys. |
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