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The Role of Boron in the Mechanical Milling of Titanium-6 %Aluminium-4% Vanadium Powders

Published online by Cambridge University Press:  21 February 2011

A.P. Brown ,
R. Brydson ,
C. Hammond ,
T.M.T. Godfrey  and
A. Wisbey
A.P. Brown
Affiliation:
Department of Materials, School of Process, Environmental and Materials Engineering, University of Leeds, Leeds, LS2 9JT, UK
R. Brydson
Affiliation:
Department of Materials, School of Process, Environmental and Materials Engineering, University of Leeds, Leeds, LS2 9JT, UK
C. Hammond
Affiliation:
Department of Materials, School of Process, Environmental and Materials Engineering, University of Leeds, Leeds, LS2 9JT, UK
T.M.T. Godfrey
Affiliation:
Structural Materials Centre, Defence Evaluation Research Agency (DERA), Farnborough, Hants, U14 OLX, UK
A. Wisbey
Affiliation:
Structural Materials Centre, Defence Evaluation Research Agency (DERA), Farnborough, Hants, U14 OLX, UK
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Abstract

The reduction in grain size of a metal can lead to significant improvement in mechanical properties. Mechanical alloying (MA) with a second phase is a possible route to producing fine-grained, particulate reinforced material. This study describes the microstructural development of Ti-6%Al-4%V milled with increasing concentrations of boron. Mechanical milling of Ti-6%Al-4%V powder produces a nanocrystalline material. MA of Ti-6%Al-4%V with boron results in the alloying of the two to form either a boride or an amorphous phase when the local concentration of boron is ∼ 50 at.%. During milling, the boron tends to remain near to its original particle form and in these boron-rich regions TiB is formed. Beyond these regions small amounts of boron (a few at.%) mix with the titanium matrix and reduce further the grain size of the titanium. An increase in the global concentration of boron increases the volume fraction of boride produced.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 581: Symposium F – Nanophase & Nanocomposite Materials II , 1999 , 265
Copyright
Copyright © Materials Research Society 2000

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References

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