Journal
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
Volume 65, Issue -, Pages 2-8Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrmhm.2016.11.013
Keywords
Nanocrystalline material; Tungsten; Titanium; Sintering; Grain growth; Ultrafine grain
Funding
- U.S. Department of Energy (DOE), Office of Science, Fusion Material Program [DESC0008673]
- U.S. Department of Defense (DOD) [W15QKN-13-C-0068, W15QKN-15-C-0038]
- NSF [DMR-1121252]
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Tungsten (W) is a brittle material at room temperature making it very difficult to fabricate. Although the lack of ductility remains a difficult challenge, nano-sized and ultrafine grain (UFG) microstructures offer potential for overcoming tungsten's room temperature brittleness. One way to manufacture UFG W is to compact and sinter nanosized W powder, however, it is a non-trivial task to control grain growth during sintering. In an effort to inhibit grain growth, the effect of Ti-based additives on the densification and grain growth of nano-W powders was investigated in this study. The addition of 1 wt.% Ti into tungsten led to more than a 63% decrease in average grain size of sintered samples at comparable density levels. It was also found that sintering in Ar yielded a finer grain size than sintering in H-2 at similar densities. Compared to conventional high temperature sintering, a lower temperature sintering cycle for a longer hold time resulted in both near-full density and fine grain size. The roles of the Ti additive include not only the inhibition of grain growth, but also the potential absorption of oxygen from W particles. (C) 2016 Elsevier Ltd. All rights reserved.
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