Structural characterization of the {11$\overline 2$2} twin boundary and the corresponding stress accommodation mechanisms in pure titanium

doi:10.1016/j.jmst.2020.07.030

Abstract

Abstract:

{11$\overline 2$2} compression twin plays an important role in accommodating deformation along the c axis of HCP metals. However, the studies on the interface structure of {11$\overline 2$2} twin boundary (TB), especially the twin tip, and the corresponding local stress release mechanism are still limited. This work studied the interface characters of {11 $\overline 2$ 2} TB of a deformed pure titanium by transmission electron microscope. The {11 $\overline 2$ 2} TB presented serrated character, consisting of coherent twin boundary (CTB) and (0002)_T // (11$\overline 2$$\overline 2$)_M or (11$\overline 2$$\overline 2$)_T // (0002)_M steps, and the twin tip was fully composed of the basal-pyramidal (BPy) and pyramidal-basal (PyB) steps. The twin tip presents asymmetric morphology and the step height at the twin tip is much larger than that away from the twin tip. Two types of local stress accommodation mechanisms were observed: zonal dislocation emission and hexagonal close packed structure to face-centered cubic structure transformation. The zonal dislocation was produced by the dissociation of the 1/3 < 11 $\overline 2$$\overline 3$ ><c + a> dislocation that was nucleated at the twin tip and the phase transformation was introduced by emission of Shockley partial dislocations from the {11 $\overline 2$ 2} twin boundary.

Key words: {11$\overline 2$2}, twin, Twin boundary, Twinning dislocation, Stress accommodation, Titanium

Bingqiang Wei, Song Ni, Yong Liu, Min Song. Structural characterization of the {11$\overline 2$2} twin boundary and the corresponding stress accommodation mechanisms in pure titanium[J]. J. Mater. Sci. Technol., 2021, 72: 114-121.

Figures/Tables 7

Fig. 1. (a) EBSD IPF figure of the annealed sample, (b) {0001} pole figure and (c) {10 $\overline 1$ 0} pole figure.

Fig. 2. (a) Bright field TEM image of the {11 $\overline 2$ 2} twins, (b) SAED pattern of the {11 $\overline 2$ 2} twin and (c-d) Fourier-filtered HRTEM images of the {11 $\overline 2$ 2} twin boundary.

Fig. 3. (a) Fourier-filtered HRTEM image of the {11 $\overline 2$ 2} twin tip, and FFT patterns of (b) the matrix and (c) twin in Fig. 3a, respectively.

Fig. 4. (a) HRTEM image of the {11 $\overline 2$ 2} twin tip accommodated with the zonal dislocation, FFT patterns of (b) the matrix and (c) twin in Fig. 4(a), respectively, and (d) schematic diagram for the zonal dislocation produced at the {11 $\overline 2$ 2} twin tip.

Fig. 5. (a) Bright field and (b) dark filed two-beam images of the dislocations with g = 0002.

Fig. 6. (a) Fourier-filtered HRTEM image of the HCP-FCC interface along the zone axis of [1 $\overline 2$ 10]HCP//[1 $\overline 1$ 0]FCC, (b) the corresponding FFT pattern of (a), and (c) pole direction of the HCP and FCC phases. (d) HRTEM image of the HCP-FCC interface along the zone axis [1 $\overline 1$ 00]HCP//[$\overline 2$ 11]FCC, (e) the corresponding FFT pattern of (d), and (f) Fourier filter HRTEM image corresponding the area marked by the white dashed square in (d).

Fig. 7. (a) HRTEM image of the {11 $\overline 2$ 2} twin tip accommodated by HCP to FCC transformation and (b-c) the corresponding FFT patterns of areas b and c in (a). (d) HRTEM image of the {11 $\overline 2$ 2} twin boundary accommodated by HCP to FCC transformation and (e-f) the corresponding FFT patterns of areas e and f in (d). (g) The schematic diagram of HCP to FCC transformation mechanism at the {11 $\overline 2$ 2} twin boundary.

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