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GRAPHICAL ABSTRACT
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PUBLIC SUMMARY
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Coupled formation of lamellae is observed by identifying alternative segregation at lamellar interfaces.
A coupled nucleation model is proposed for lamellar structure.
Coupled nucleation and growth of lamellae is due to the smaller free energy barrier and interfacial anisotropy.
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ABSTRACT
Although lamellar structures widely exist in materials, the existing nucleation knowledge has failed to describe the nucleation process of lamellae. This is because it involves the simultaneous formation of two different phases whose early-stage nuclei are always anisotropic and ordered. We report here a coupled nucleation of lamellae in a eutectoid TiAl system, demonstrating the coupled formation of a pair of anisotropic and ordered α2 + γ lamellae from the matrix, and each pair nucleates independently and heterogeneously. The coupled pair has been identified by alternative segregation of Nb in the interface using atom probe tomography. The nucleation kinetics have been confirmed by atomistic simulations and in situ high-energy synchrotron X-ray diffraction. A theoretical model has been proposed for this heterogeneously coupled nucleation, offering potential applications in various systems or phase transitions involving anisotropic, ordered, or lamellar structures. This coupled nucleation model represents a significant enhancement to the existing nucleation theory. -
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REFERENCES
[1] Volmer, M., and Weber, A. (1926). Keimbildung in cubersCattigten gebilden, Z. Phys. Chem. 119, 277−301. [2] Becker, R., and Döring, W. (1935). The kinetic treatment of nuclear formation in supersaturated vapors. Annals of Physics 24, 719−752. [3] Turnbull, D., and Fisher, J. C. (1949). Rate of nucleation in condensed systems. J. Chem. Phys. 17, 71−73. [4] Turnbull, D. (1956). Solid State Physics. Academic Press, https://doi.org/10.1016/C2010-0-66724-1 [5] Gleiser, M., and Howell, R.C. (2005). Resonant nucleation. Phys. Rev. Lett. 94, 151601. [6] Heermann, D.W., and Klein, W. (1983). Nucleation and growth of nonclassical droplets. Phys. Rev. Lett. 50, 1062. [7] Gránásy, L., Pusztai, T., Saylor, D., and Warren, J.A. (2007). Phase field theory of heterogeneous crystal nucleation. Phys. Rev. Lett. 98, 035703. [8] Yau, S.-T., and Vekilov, P. G. (2000). Quasi-planar nucleus structure in apoferritin crystallization. Nature 406, 494−497. [9] Zhou, J., Yang Y.S., Yang Y., et al. Schmid A.K., Nathanson M., et al. (2019). Observing crystal nucleation in four dimensions using atomic electron tomography. Nature 570, 500−503. [10] Tan, P., Xu, N., and Xu, L. (2014). Visualizing kinetic pathways of homogeneous nucleation in colloidal crystallization. Nature Physics 10, 73−79. [11] Gasser, U., Weeks, E.R., Schofield, A., et al. (2001). Real-space imaging of nucleation and growth in colloidal crystallization. Science 292, 258−262. [12] Tammann, G., Dean, R.S., and Swenson, L.G. (1925). A text book of metallography: chemistry and physics of the metals and their alloys. Chemical Catalog Co. [13] Hull, F.C., and Mehl, R.F. (1942). The structure of pearlite. Trans. ASM 30, 381−424. [14] Zener, C. (1946). Kinetics of the decomposition of austenite. Trans. AIME 167, 550−595. [15] Tiller, W.A. (1958). Polyphase solidification, in liquid metals and solidification. ASM Cleveland, 276-318. [16] Hillert, M. (1962). Decomposition of austenite by diffusional processes, V. F. Zackay and H. I. Aaronson ed, John Wiley Inc., 197-237. [17] Chadwick, G.A. (1963). Eutectic alloy solidification. Prog. Mater Sci. 12, 99−182. [18] Aaronson, H.I., Enomoto, M., and Lee, J.K., (2010). Mechanisms of Diffusional Phase Transformations in Metals and Alloys, CRC Press. [19] Kim, Y.W. (1994). Ordered intermetallic alloys, part III: gamma titanium aluminides. JOM 46, 30−39. [20] Clemens, H., and Kestler, H. (2000). Processing and applications of intermetallic γ-TiAl-based alloys. Adv. Eng. Mater. 2, 551−570. [21] Bewlay, B.P., Weimer, M., Kelly, T., et al. (2013). The science, technology, and implementation of TiAl alloys in commercial aircraft Engines. MRS Proceedings 1516, 49−58. [22] Chen, G., Peng, Y., Zheng G., et al. (2016). Polysynthetic twinned TiAl single crystals for high temperature applications. Nat. Mater. 15, 876−881. [23] Schuster, J.C., and Palm, M. (2006). Reassessment of the binary aluminum-titanium phase diagram. J.Phase Equilib. Diff. 27, 255−277. [24] Appel, F., Paul, J.D.H., and Oehring, M. (2011). Gamma titanium aluminide alloys: science and technology. John Wiley & Sons. [25] Jones, S.A., and Kaufman, M.J. (1993). Phase equilibria and transformations in intermediate titanium-aluminum alloys. Acta Metall. 41, 387−398. [26] Denquin, A., and Naka, S. (1996). Phase transformation mechanisms involved in two-phase TiAl-based alloys—I. Lamellar structure formation. Acta Mater. 44, 343−352. [27] Pond, R. C., Shang, P., Cheng, T. T. and Aindow, M. (2000). Interfacial dislocation mechanism for diffusional phase transformations exhibiting martensitic crystallography formation of TiAl + Ti3Al lamellae. Acta Mater. 48, 1047−1053. [28] Blackburn, M.J. (1970). The Science, technology, and application of titanium. Pergamon. [29] Menand, A., Zapolsky-Tatarenko, H., and Nerac-Partaix, A. (1998). Atom-probe investigations of TiAl alloys. Mater. Sci. Eng. A 250, 55−64. [30] Gerstl, S.S.A., Kim, Y.W., and Seidman, D.N. (2004). Atomic scale chemistry of α2/γ interfaces in a multi-component TiAl alloy. Interface Science, 12, 303−310. [31] Draper, S.L., and Isheim, D. (2012). Environmental embrittlement of a third generation γ TiAl alloy. Intermetallics 22, 77−83. [32] Mishin, Y., and Herzig, C. (2000). Diffusion in the Ti-Al system. Acta Mater. 48, 589−623. [33] Ren, G.D., and Sun, J. (2018). High-resolution electron microscopy characterization of modulated structure in high Nb-containing lamellar γ-TiAl alloy. Acta Mater. 144, 516−523. [34] Porter, D.A., Easterling, K.E., and Sherif, M.Y. (2009). Phase transformations in metals and alloys. CRC Press. [35] Soper, A. (2000). The radial distribution functions of water and ice from 220 to 673 K and at pressures up to 400 MPa. Chem. Phys. 258, 121−137. [36] Zhang, L.C., Cheng, T.T., and Aindow, M. (2004). Nucleation of the lamellar decomposition in a Ti-44Al-4Nb-4Zr alloy. Acta Mater. 52, 191−197. [37] Kainuma, R., Fujita, Y., Mitsui, H., et al. (2000). Phase equilibria among α (hcp), β (bcc) and γ (L10) phases in Ti-Al base ternary alloys. Intermetallics 8, 855−867. [38] Zope, R. R., and Mishin, Y. (2003). Interatomic potentials for atomistic simulations of the Ti-Al system. Phys. Rev. B 68, 024102. [39] Farkas, D., and Jones, C. (1996). Interatomic potentials for ternary Nb-Ti-Al alloys. Model. Simul. Mater. Sc. 4, 23−32. [40] Hoover, W.G. (1985). Canonical dynamics: Equilibrium phase-space distributions. Phys. Rev. A 31, 1695−1697. [41] Hoover, W.G. (1986). Constant-pressure equations of motion. Phys. Rev. A. 34, 2499−2500. [42] Stukowski, A. (2010). Visualization and analysis of atomistic simulation data with OVITO–the Open Visualization Tool. Model. Simul. Mater. Sc. 18, 015012. [43] Larsen, P.M., Schmidt, S., and Schiøtz, J. (2016). Robust structural identification via polyhedral template matching. Model. Simul. Mater. Sc. 24, 055007. -
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Zheng G., Chen Y., Xiang H., et al., (2023). Coupled nucleation of dual-phase lamellar structure. The Innovation Materials 1(3), 100043. https://doi.org/10.59717/j.xinn-mater.2023.100043
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Zheng G., Chen Y., Xiang H., et al., (2023). Coupled nucleation of dual-phase lamellar structure. The Innovation Materials 1(3), 100043. https://doi.org/10.59717/j.xinn-mater.2023.100043
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Figure 1.
TEM and APT analysis of the TiAl lamellar structure
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Figure 2.
SEM and APT reconstructed TiAl lamellar structures after annealing
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Figure 3.
The coupled nucleation model for TiAl lamellae
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Figure 4.
MD simulations of dual-phase TiAl lamellar nucleation
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Figure 5.
In situ HEXRD measurement of binary Ti-Al alloy during continuous cooling
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