Creep of alpha-titanium at low stresses

Malakondaiah, G. ; Rama Rao, P. (1981) Creep of alpha-titanium at low stresses Acta Metallurgica, 29 (7). pp. 1263-1275. ISSN 0001-6160

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Low-stress creep behaviour of alpha-titanium has been investigated over the range of temperature from 823-1088 K (0.43-0.56 Tm), grain size from 34-443 μm and stresses upto 2.0MN/m2. Resistance heated helical specimens were crept under their own weight and the deflections of individual coils were monitored in situ as a function of time by direct observation through a transparent vacuum chamber using a cathetometer. Analysis of the results has been made with the objective of establishing regimes of stress, temperature and grain size within which a specific creep mechanism controls deformation. Coble, Nabarro-Herring, Harper-Dorn and power-law creep mechanisms have been considered. It is shown that low temperatures and fine grain sizes are conducive to the dominance of Coble creep while Nabarro-Herring and Harper-Dorn creep processes respectively predominate in the intermediate temperature-intermediate grain size and intermediate temperature-coarse grain size regimes. In all these situations Newtonian viscous behaviour with negligible threshold stress has been observed. Analysis of the strain rate vs stress data above a transition stress, corresponding to the stress at which an upward deviation from linearity occurs, has established the operation of power-law creep. On the basis of the experimental results, Ashby- and Langdon-type creep mechanism maps have been constructed for alphatitanium.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:41789
Deposited On:31 May 2011 08:28
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