- Estimation of a Lattice Parameter of Sintered Ni-W Alloy Rods by a Neutron Diffraction Method
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Chan-Joong Kim, Min-Woon Kim, Soon-Dong Park, Byung-Hyuk Jun, Serk-Won Jang, Baek-Seok Seong
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J Korean Powder Metall Inst. 2008;15(3):239-243.
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DOI: https://doi.org/10.4150/KPMI.2008.15.3.239
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 Abstract
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- Ni-W(1-5 at.%) alloy rods were made by powder metallurgy process including powder mixing, compacting and subsequent sintering. Ni and W powder of appropriate compositions were mixed by a ball milling and isostatically pressed in a rubber mold into a rod. The compacted rods were sintered at 1000°C-1150°C at a reduced atmosphere for densification. The lattice parameters of Ni-W alloys were estimated by a high resolution neutron powder diffractometer. All sintered rods were found to have a face centered cubic structure without any impurity phase, but the diffraction peak locations were linearly shifted with increasing W content. The lattice parameter of a pure Ni rod was 3.5238AA which is consistent with the value reported in JCPDS data. The lattice parameter of N-W alloy rods increased by 0.004AA for 1 atomic % of W, which indicates the formation of a Ni-W solid solution due to the substitution of nickel atoms by tungsten atoms of larger size.
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