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Sintering mechanisms of attrition milled titanium nano powder

Published online by Cambridge University Press:  01 April 2005

B.B. Panigrahi ,
M.M. Godkhindi ,
K. Das ,
P.G. Mukunda ,
V.V. Dabhade  and
P. Ramakrishnan
B.B. Panigrahi*
Affiliation:
Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Kharagpur, 721302 India
M.M. Godkhindi
Affiliation:
Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Kharagpur, 721302 India
K. Das
Affiliation:
Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Kharagpur, 721302 India
P.G. Mukunda
Affiliation:
Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Kharagpur, 721302 India
V.V. Dabhade
Affiliation:
Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology, Bombay, 400076 India
P. Ramakrishnan
Affiliation:
Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology, Bombay, 400076 India
*
a) Address all correspondence to this author. e-mail: bharat@metal.iitkgp.ernet.in
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Abstract

Detailed sintering studies have been carried out on attrition milled nanocrystalline titanium powder through isothermal dilatometry over a temperature range of 300–1250 °C along with microstructural and x-ray diffraction studies. The sintering behavior of attrition milled nanocrystalline titanium appears to be characterized by: (i) very low activation energies, (ii) high shrinkage anisotropy, (iii) very rapid grain growth in the beta range, and (iv) two kinds of densification processes, namely, intra-agglomerate and inter-agglomerate. Analysis of the kinetic data through sintering diagram approach indicates the operation of particle sliding and grain boundary rotation, type of mechanism in addition to the grain-boundary diffusion, and lattice diffusion as the dominant mass transport mechanisms.

Keywords

Grain growthNanoparticleSintering
Type
Research Article
Information
Journal of Materials Research , Volume 20 , Issue 4 , April 2005 , pp. 827 - 836
Copyright
Copyright © Materials Research Society 2005

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