Metall. Res. Technol.
Volume 114, Number 4, 2017
|Number of page(s)||8|
|Published online||03 July 2017|
Contribution rates of constituent phases to macro-stress and -strain of two-phase titanium alloy
National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University,
066004, PR China
* Corresponding author: email@example.com
Received in final form: 21 April 2017
Accepted: 3 May 2017
In order to study the deformation characteristic of the two-phase titanium alloy at the microlevel, the stress-strain relationship of primary α phase (αp) is developed with consideration of geometrically necessary dislocations which are caused by the strain partition between the constituent phases, whereas the stress-strain relationship of transformed β matrix (βt) is calculated with the data of microindentation tests. Then the modified law of mixture is applied to analyze the contribution rates of constituent phases to macro-stress and -strain. The results show that the contribution rates of constituent phases to macro-stress and -strain are continually changing in the whole deformation process, and they are also affected by the fraction and sizes of the constituent phases. The fraction of each phase is a decisive factor in the contribution rates to macro-stress and -strain. Moreover, when the fraction of each phase is fixed, with the increase of the size of αp, the contribution rate of αp to macro-stress tends to decline, while the contribution rate to macro-strain tends to ascend.
Key words: two-phase titanium alloy / microstructure / stress-strain relationship / contribution rate
© EDP Sciences, 2017
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