Metastable orthorhombic phases at ambient pressure in mechanically milled pure Ti and Ti–Mg

Nanocrystalline Ti and Ti–20at.% Mg produced by mechanical milling were characterized using nanobeam diffraction. Metastable ω (hexagonal) and γ (orthorhombic) phases were observed in the pure Ti, while γ, a new orthorhombic ε phase and a face-centred cubic (fcc) phase were identified in the Ti–Mg....

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Bibliographic Details
Published in:Scripta materialia 2014-12, Vol.93, p.32-35
Main Authors: Wei, X.S., Xu, W., Xia, K.
Format: Article
Language:English
Subjects:
Diffraction
Immiscible alloys
Magnesium
Mechanical alloying
Mechanical milling
Metastable phases
Nanocrystals
Orthorhombic phase
Phases
Shear stress
Titanium
Titanium alloys
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Summary:Nanocrystalline Ti and Ti–20at.% Mg produced by mechanical milling were characterized using nanobeam diffraction. Metastable ω (hexagonal) and γ (orthorhombic) phases were observed in the pure Ti, while γ, a new orthorhombic ε phase and a face-centred cubic (fcc) phase were identified in the Ti–Mg. γ, found so far only at high pressures, was produced by a combination of high impact pressure and shear stress during milling. The forced dissolution of Mg caused the formation of the ε and fcc phases.
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2014.08.024