| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 237122 | Powder Technology | 2012 | 5 Pages |
Nanocrystalline W powders with an average crystallite size of about 50 nm were produced by mechanical milling. BCT phase was mechanically induced as a result of BCC lattice deformation (compression) along [110], upon 10 h, 20 h and 30 h milling corresponding to a magnetic saturation of 1.3, 6.9, and 9.8 μTm3/kg. This BCT phase suggests the tetragonal deformation path to be responsible for the observed anomalous magnetism in W. Following DSC–TG thermal analysis, a magnetic saturation of 68 μTm3/kg was obtained upon annealing the 30 h milled W powder at 1200 °C. In addition, two BCT phases with c/a = 1.313 (a = 0.29066, c = 0.38170 nm) and 0.907 (a = 0.32602, c = 0.29575 nm) were detected.
Graphical abstractXRD patterns of W (a) milled for 0, 10, 20, 30 h, (b) annealed at 1100 °C and (c) annealed at 1200 °C.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights►Nanocrystalline W powders with D = 50 nm were produced by MM. ►BCT phase was induced due to compression of BCC lattice along [110]. ►10, 20 and 30 h milled powder yielded magnetic saturation of ~ 1, 7 and 10 μTm3/kg. ►Tetragonal deformation path is responsible for observed anomalous magnetism in W. ►Upon 1200 °C annealing, a magnetic saturation of 68 μTm3/kg was obtained.
