Structural characterization of mechanically milled and annealed tungsten powder

A. S. Bolokang; M. J. Phasha; Kasonde Maweja; S. Bhero

doi:10.1016/j.powtec.2012.03.028

Structural characterization of mechanically milled and annealed tungsten powder

A. S. Bolokang, M. J. Phasha, Kasonde Maweja, S. Bhero

Chemical, Materials & Metallurgical Engineering

Research output: Contribution to journal › Article

3 Citations (Scopus)

Abstract

Nanocrystalline W powders with an average crystallite size of about 50nm were produced by mechanical milling. BCT phase was mechanically induced as a result of BCC lattice deformation (compression) along [110], upon 10h, 20h and 30h milling corresponding to a magnetic saturation of 1.3, 6.9, and 9.8μTm ³/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 68μTm ³/kg was obtained upon annealing the 30h milled W powder at 1200°C. In addition, two BCT phases with c/a=1.313 (a=0.29066, c=0.38170nm) and 0.907 (a=0.32602, c=0.29575nm) were detected.

Original language	English
Pages (from-to)	27-31
Number of pages	5
Journal	Powder Technology
Volume	225
DOIs	https://doi.org/10.1016/j.powtec.2012.03.028
Publication status	Published - Jul 1 2012

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All Science Journal Classification (ASJC) codes

Chemical Engineering(all)

Cite this

Bolokang, A. S., Phasha, M. J., Maweja, K., & Bhero, S. (2012). Structural characterization of mechanically milled and annealed tungsten powder. Powder Technology, 225, 27-31. https://doi.org/10.1016/j.powtec.2012.03.028

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abstract = "Nanocrystalline W powders with an average crystallite size of about 50nm were produced by mechanical milling. BCT phase was mechanically induced as a result of BCC lattice deformation (compression) along [110], upon 10h, 20h and 30h milling corresponding to a magnetic saturation of 1.3, 6.9, and 9.8μTm 3/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 68μTm 3/kg was obtained upon annealing the 30h milled W powder at 1200°C. In addition, two BCT phases with c/a=1.313 (a=0.29066, c=0.38170nm) and 0.907 (a=0.32602, c=0.29575nm) were detected.",

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N2 - Nanocrystalline W powders with an average crystallite size of about 50nm were produced by mechanical milling. BCT phase was mechanically induced as a result of BCC lattice deformation (compression) along [110], upon 10h, 20h and 30h milling corresponding to a magnetic saturation of 1.3, 6.9, and 9.8μTm 3/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 68μTm 3/kg was obtained upon annealing the 30h milled W powder at 1200°C. In addition, two BCT phases with c/a=1.313 (a=0.29066, c=0.38170nm) and 0.907 (a=0.32602, c=0.29575nm) were detected.

AB - Nanocrystalline W powders with an average crystallite size of about 50nm were produced by mechanical milling. BCT phase was mechanically induced as a result of BCC lattice deformation (compression) along [110], upon 10h, 20h and 30h milling corresponding to a magnetic saturation of 1.3, 6.9, and 9.8μTm 3/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 68μTm 3/kg was obtained upon annealing the 30h milled W powder at 1200°C. In addition, two BCT phases with c/a=1.313 (a=0.29066, c=0.38170nm) and 0.907 (a=0.32602, c=0.29575nm) were detected.

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10.1016/j.powtec.2012.03.028