Journal
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
Volume 53, Issue -, Pages 134-138Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrmhm.2015.07.006
Keywords
Nano tungsten (nano-W); High green density compaction; DBTT; Grain growth; Fusion reactors
Funding
- U.S. Department of Energy (DOE), Office of Science, Fusion Materials Program [DESC0008673]
- U.S. Department of Defense (DOD), SBIR program
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Tungsten is a primary candidate material for certain structural applications in future fusion reactors. However, drawbacks associated with these applications include the need for low ductile to brittle transition temperature (DBTT) and significant demands for fracture toughness.A possible solution to these problems is nanostructuring of tungsten (nano-W; grain size < 100 nm) following the conventional press-sinter route, which is quite economical. High green density and low temperature sintering are the critical factors for preserving nanoscale grains. Previous works, and our experience, have shown that it is nearly impossible to get high green density (>40% relative density) of compacts for nano tungsten powders made by high-energy milling. This makes the material prone to rapid grain growth; with a grain size well over 100 nm before complete densification, even at 1000 degrees C. In this work, a high density green compaction method for nano-W powders was demonstrated, which can improve green density by at least 18% in relative density. Additionally, the effect of green density on the sintering behavior of nano-W was investigated. (C) 2015 Elsevier Ltd. All rights reserved.
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