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

Metallurgy

Research output: Contribution to journal › Article › peer-review

7 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 2012

Keywords

Magnetic saturation
Mechanical milling
Nanocrystalline
Tungsten

ASJC Scopus subject areas

General Chemical Engineering

Access to Document

10.1016/j.powtec.2012.03.028

Cite this

@article{ce0fd6709a1b434093e800cf349feebb,

title = "Structural characterization of mechanically milled and annealed tungsten powder",

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.",

keywords = "Magnetic saturation, Mechanical milling, Nanocrystalline, Tungsten",

author = "Bolokang, \{A. S.\} and Phasha, \{M. J.\} and Kasonde Maweja and S. Bhero",

year = "2012",

month = jul,

doi = "10.1016/j.powtec.2012.03.028",

language = "English",

volume = "225",

pages = "27--31",

journal = "Powder Technology",

issn = "0032-5910",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Structural characterization of mechanically milled and annealed tungsten powder

AU - Bolokang, A. S.

AU - Phasha, M. J.

AU - Maweja, Kasonde

AU - Bhero, S.

PY - 2012/7

Y1 - 2012/7

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.

KW - Magnetic saturation

KW - Mechanical milling

KW - Nanocrystalline

KW - Tungsten

UR - https://www.scopus.com/pages/publications/84861190874

U2 - 10.1016/j.powtec.2012.03.028

DO - 10.1016/j.powtec.2012.03.028

M3 - Article

AN - SCOPUS:84861190874

SN - 0032-5910

VL - 225

SP - 27

EP - 31

JO - Powder Technology

JF - Powder Technology

ER -

Structural characterization of mechanically milled and annealed tungsten powder

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this