Issue |
Metall. Res. Technol.
Volume 114, Number 4, 2017
|
|
---|---|---|
Article Number | 408 | |
Number of page(s) | 8 | |
DOI | https://doi.org/10.1051/metal/2017034 | |
Published online | 03 July 2017 |
Regular Article
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,
Qinhuangdao
066004, PR China
* Corresponding author: pengyan@ysu.edu.cn
Received:
23
February
2017
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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