Journal
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
Volume 78, Issue -, Pages 1-8Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrmhm.2018.08.009
Keywords
Tungsten heavy alloy; Liquide-liquid doping; Zirconia; Compressive strength; Strengthening mechanism
Funding
- National Natural Science Foundation of China [U1704152]
- Plan for Scientific Innovation Talent of Henan province, China [174100510012]
- National Key R&D Program of China [2017YFB0302100]
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A new tungsten heavy alloy, which is characterized by fine yttria stabilized cubic zirconia (c-ZrO2(Y)) particles dispersed in the alloy, was developed by an ion-level liquide-liquid (L-L) doping technique combined with mechanical alloying. The microstructure and mechanical properties of tungsten heavy alloy were investigated, and the formation process and role of zirconia were discussed. Results show the zirconium element transforms in an order of Zr4+ to Zr(WO4)(2) or 2Zr(WO4)(2) nH(2)O to m-ZrO2 in the preparation process of powders. Finally, the c-ZrO2(Y) particles with size of 200-1000 nm are obtained in tungsten heavy alloy during sintering at 1520 degrees C for 90 min. Most of c-ZrO2(Y) particles are distributed within tungsten grains, and some c-ZrO2(Y) particles tend to be dispersed at the interfaces of tungsten grains, while a small number of c-ZrO2(Y) particles are dispersed in gamma(e, Ni, W) matrix. The compressive strength of new alloy is improved approximately 8.2% than that of 93 W-4.9Ni-2.1Fe. This attributes to c-ZrO2(Y), which refines tungsten grain, lowers W-W contiguity and strengthens tungsten and gamma(Fe, Ni, W) grains.
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