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. 2022 Aug 2;15(15):5325.
doi: 10.3390/ma15155325.

Study of Microstructural Morphology of Ti-6Al-4V Alloy by Crystallographic Analysis and Phase Field Simulation

Hao Xiang  1 , Wim Van Paepegem  2 , Leo A I Kestens  1
Affiliations

Study of Microstructural Morphology of Ti-6Al-4V Alloy by Crystallographic Analysis and Phase Field Simulation

Hao Xiang et al. Materials (Basel). .

Abstract

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.

Keywords: Phenomenological Theory of Martensitic Transformation; Ti-6Al-4V; martensitic transformation; phase field simulation; twins.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Crystal lattice of parent BCC and product HCP phase, and orthogonal lattice correspondence between BCC and HCP phase.
Figure 2
Figure 2
Microstructure evolution during martensitic transformation (a–e), and volume fraction of variants as a function of reduced simulation time (f).
Figure 3
Figure 3
Microstructure observation: (a) Secondary electron SEM image; (b) EBSD scan color coded according to the inverse pole figure legend shown in (c) the details of EBSD observation are reported in Ref. [69].
Figure 4
Figure 4
Twinned microstructure with different variant combinations: (a) compound twin; (b) Type I twin and (c) Type II twin.
Figure 5
Figure 5
Crossing twinned microstructure with variants 1/2/5/6 and their corresponding shear vectors in the interfacial regions.
Figure 6
Figure 6
Triangular morphology with different variant combinations during martensitic transformation by phase field modelling.
See this image and copyright information in PMC

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