Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8955437 | International Journal of Refractory Metals and Hard Materials | 2019 | 30 Pages |
Abstract
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 nH2O to m-ZrO2 in the preparation process of powders. Finally, the c-ZrO2(Y) particles with size of 200-1000â¯nm are obtained in tungsten heavy alloy during sintering at 1520â¯Â°C for 90â¯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 γ(Fe, Ni, W) matrix. The compressive strength of new alloy is improved approximately 8.2% than that of 93â¯W-4.9Ni-2.1Fe. This attributes to c-ZrO2(Y), which refines tungsten grain, lowers W-W contiguity and strengthens tungsten and γ(Fe, Ni, W) grains.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Liujie Xu, Fangnao Xiao, Shizhong Wei, Yucheng Zhou, Kunming Pan, Xiuqing Li, Jiwen Li, Wei Liu,