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Sintering of beta titanium: Role of dislocation pipe diffusion

Sundaresan, R and Raghuram, AC and Mallya, RM and Vasu, KI (1996) Sintering of beta titanium: Role of dislocation pipe diffusion. In: Powder Metallurgy, 39 (2). pp. 138-142.

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Official URL: http://cat.inist.fr/?aModele=afficheN&cpsidt=31867...

Abstract

Sintering of titanium in its high temperature beta phase was studied by isothermal dilatometry. The sintering shrinkage y did not follow the normal time exponent type of behaviour, instead being described by the equation y = Kt(m)/[1-(A+Bt)(2)], where m = 1.93 +/- 0.07, with an activation energy of 62-90 kJ mol(-1). A detailed analysis of these results, based on the 'anomalous' diffusion behaviour reported for beta titanium, is carried out. It is shown that the generation of a high density of dislocations during the alpha --> beta phase transformation, coupled with sluggish recovery at the sintering necks, enables sintering mass transport by pipe diffusion through dislocation cores from sources of matter within the particles to become dominant.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Institute of Materials, Minerals and Mining.
Keywords: Sintering;Shrinkage;Anomaly;Diffusion;Dislocation density; Phase transformation;Dislocation core;Diffusion coefficient ;Titanium;Powder metallurgy;
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 13 May 2011 10:16
Last Modified: 13 May 2011 10:16
URI: http://eprints.iisc.ernet.in/id/eprint/37533

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