Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7990063 | Journal of Alloys and Compounds | 2018 | 25 Pages |
Abstract
The tungsten alloys reinforced by ZrO2 were prepared using azeotropic distillation method combined with powder metallurgy method, and then the sintered tungsten alloys were swaged to obtain compact bars. The microstructures of W-xZrO2 (xâ¯=â¯0, 0.25, 1.0 and 1.5â¯wt%) alloys were investigated by means of SEM, XRD and TEM. The results show that ZrO2 exist as a stable cubic phase in tungsten alloys by adding Y2O3. Fine ZrO2 particles (500-800â¯nm) are dispersed in the tungsten matrix, and thus refine the grain size and improve the physical properties and strength of tungsten alloys. With the increase of the ZrO2 content, the relative density, hardness and compressive strength of tungsten alloys were all increased. The swaged W-1.5â¯wt%ZrO2 alloy shows the finest microstructure with an average grain size of 47.18â¯Î¼m, reducing 34.76% compared with that of pure tungsten. And thus, the swaged W-1.5â¯wt%ZrO2 alloy achieves the highest compressive strength (1941.3â¯MPa) and failure strain (23.1%) at the same time, increasing 23.27% and 22.37%, respectively, compared with that of pure tungsten.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Zhou Li, Liujie Xu, Shizhong Wei, Chong Chen, Fangnao Xiao,