Journal
MATERIALS
Volume 15, Issue 15, Pages -Publisher
MDPI
DOI: 10.3390/ma15155325
Keywords
Ti-6Al-4V; martensitic transformation; phase field simulation; twins; Phenomenological Theory of Martensitic Transformation
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Funding
- China Scholarship Council [201706370021]
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In this study, the Phenomenological Theory of Martensitic Transformation (PTMT) and phase field simulation were used to investigate the martensitic transformation of Ti-6Al-4V alloy. The results showed that mechanical constraints played a crucial role in the microstructure evolution, and the formation of a triangular morphology was favored.
Formation of a habit plane during martensitic transformation is related to an invariant plane strain transformation, which involves dislocation glide and twins. In the current work, the Phenomenological Theory of Martensitic Transformation (PTMT) is employed to study the crystallographic features while the phase field simulation is used to study the microstructure evolution for martensitic transformation of Ti-6Al-4V alloy. Results show that mechanical constraints play a key role in the microstructure evolution. It is shown that a twinned structure with very small twinned variants is geometrically difficult to form due to the lattice parameters of Ti-6Al-4V alloy. It is concluded that the predicted habit plane from the PTMT is consistent with results of the micro-elastic theory. The formation of a triangular morphology is favored geometrically and elastically.
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