Solid-state transformation in nanocrystalline Ti induced by ball milling

M. J. Phasha; A. S. Bolokang; P. E. Ngoepe

doi:10.1016/j.matlet.2010.02.054

Solid-state transformation in nanocrystalline Ti induced by ball milling

M. J. Phasha, A. S. Bolokang, P. E. Ngoepe

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

48 Citations (Scopus)

Abstract

In the current study, we report for the first time a new Ti rhombohedral (trigonal) structure induced by HEBM and subsequent sintering. During ball milling of Ti powder, solid-state transformation does not only depend on the grain refinement but also on the successful deformation of the nano-sized crystallites due to high energy ball impacts. Thermal stability of Ti-nanocrystalline in FCC allotrope was investigated. Upon sintering, the unstable FCC restored back to the rhombohedral phase rather than to HCP. The appearance of HCP Ti after sintering could suggest that prolonged milling leads to dispersion of hard particles (HCP) into more ductile particles belonging to allotropic phases, and hence possibility of resurfacing on sintering.

Original language	English
Pages (from-to)	1215-1218
Number of pages	4
Journal	Materials Letters
Volume	64
Issue number	10
DOIs	https://doi.org/10.1016/j.matlet.2010.02.054
Publication status	Published - 31 May 2010
Externally published	Yes

Keywords

Ab initio calculations
Ball milling
Crystal structure
Nanocrystalline
Titanium

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1016/j.matlet.2010.02.054

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title = "Solid-state transformation in nanocrystalline Ti induced by ball milling",

abstract = "In the current study, we report for the first time a new Ti rhombohedral (trigonal) structure induced by HEBM and subsequent sintering. During ball milling of Ti powder, solid-state transformation does not only depend on the grain refinement but also on the successful deformation of the nano-sized crystallites due to high energy ball impacts. Thermal stability of Ti-nanocrystalline in FCC allotrope was investigated. Upon sintering, the unstable FCC restored back to the rhombohedral phase rather than to HCP. The appearance of HCP Ti after sintering could suggest that prolonged milling leads to dispersion of hard particles (HCP) into more ductile particles belonging to allotropic phases, and hence possibility of resurfacing on sintering.",

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T1 - Solid-state transformation in nanocrystalline Ti induced by ball milling

AU - Phasha, M. J.

AU - Bolokang, A. S.

AU - Ngoepe, P. E.

PY - 2010/5/31

Y1 - 2010/5/31

N2 - In the current study, we report for the first time a new Ti rhombohedral (trigonal) structure induced by HEBM and subsequent sintering. During ball milling of Ti powder, solid-state transformation does not only depend on the grain refinement but also on the successful deformation of the nano-sized crystallites due to high energy ball impacts. Thermal stability of Ti-nanocrystalline in FCC allotrope was investigated. Upon sintering, the unstable FCC restored back to the rhombohedral phase rather than to HCP. The appearance of HCP Ti after sintering could suggest that prolonged milling leads to dispersion of hard particles (HCP) into more ductile particles belonging to allotropic phases, and hence possibility of resurfacing on sintering.

AB - In the current study, we report for the first time a new Ti rhombohedral (trigonal) structure induced by HEBM and subsequent sintering. During ball milling of Ti powder, solid-state transformation does not only depend on the grain refinement but also on the successful deformation of the nano-sized crystallites due to high energy ball impacts. Thermal stability of Ti-nanocrystalline in FCC allotrope was investigated. Upon sintering, the unstable FCC restored back to the rhombohedral phase rather than to HCP. The appearance of HCP Ti after sintering could suggest that prolonged milling leads to dispersion of hard particles (HCP) into more ductile particles belonging to allotropic phases, and hence possibility of resurfacing on sintering.

KW - Ab initio calculations

KW - Ball milling

KW - Crystal structure

KW - Nanocrystalline

KW - Titanium

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SN - 0167-577X

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JO - Materials Letters

JF - Materials Letters

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Solid-state transformation in nanocrystalline Ti induced by ball milling

Abstract

Keywords

ASJC Scopus subject areas

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