Effect of microstructural morphology on the mechanical properties of titanium alloys

Different morphologies of α+β microstructures were obtained in a commercial Ti-6Al-4V alloy by cooling at different rates from the single β-phase region into the two phase region. The effect of such morphologies on mechanical properties was studied using hot compression tests in a Gleeble thermomech...

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Bibliographic Details
Published in:	Journal of physics. Conference series 2010-07, Vol.240 (1), p.012022
Main Authors:	Dehghan-Manshadi, A, Reid, M H, Dippenaar, R J
Format:	Article
Language:	eng
Subjects:	Beta phase Compression tests Cooling Cooling rate Grain boundaries Hot pressing Lamellar structure Mechanical properties Microstructure Morphology Phase transitions Strain rate Thermal simulators Titanium alloys Titanium base alloys Two phase
Online Access:	Get full text
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Summary:	Different morphologies of α+β microstructures were obtained in a commercial Ti-6Al-4V alloy by cooling at different rates from the single β-phase region into the two phase region. The effect of such morphologies on mechanical properties was studied using hot compression tests in a Gleeble thermomechanical simulator. A variety of complex morphologies could be obtained since the cooling rate has a significant influence on the β to α phase transformation and the resulting morphological development. While most of the β phase transformed to colonies of α at high cooling rates, it was possible to obtain a complex mixture of a colonies, grain boundary a and lamellar structure by decreasing the cooling rate. These complex morphologies each exhibited distinctive mechanical properties and characteristic dynamic phase transformation behaviour during deformation as a function of strain rate.
ISSN:	1742-6596 1742-6588 1742-6596