Singh, AK and Mohan, M and Divakar, C (1983) Pressure-induced alpha-omega transformation in titanium Features of the kinetics data. Journal of Applied Physics, 54 . pp. 5721-5726. ISSN 0021-8979Full text not available from this repository.
Use is made of the increase in the electrical resistance of the specimen associated with the alpha-omega transformation in Ti in order to obtain the fraction zeta of the omega phase as a function of time under isobaric-isothermal conditions in the pressure range 4-9 GPa and at 300 + or - 3 K. Over the entire pressure range, zeta-t data fit an equation of the form zeta = 1-exp-(t/tau) to the n power, where tau and n are constants at a given pressure. The results suggest that tau decreases rapidly and n slightly with an increase in pressure. An analysis of tau-p data reveals that the activation free energy for the total process is very high at low pressures and decreases rapidly with increasing pressure and that the activation volume in the 6-9 GPa range is -4.3 cu cm/mol. The activation enthalpy is obtained by measuring tau at different temperatures; the average value in the pressure range 5-8 GPa is 12 + or - 0.5 kcal/mol.
|Item Type:||Journal Article|
|Uncontrolled Keywords:||Activation energy;Electrical resistance;Phase transformations;Pressure effects;Titanium;Close packed lattices;Enthalpy;Hexagonal cells;Kinetics;Nucleation|
|Subjects:||CHEMISTRY AND MATERIALS > Metals and Metallic Materials|
|Division/Department:||Materials Science Division, Materials Science Division, Materials Science Division|
|Depositing User:||Ms. Alphones Mary|
|Date Deposited:||28 Jan 2006|
|Last Modified:||24 May 2010 09:39|
Actions (login required)