Crystal dynamics of the BCC-HCP martensitic transformation: II. Morphology
Tóm tắt
A dynamic theory of the formation of martensite crystals upon the bcc-hcp transformation based on the concepts of the heterogeneous nucleation and related controlling wave process is presented. It is shown that the entire set of the observed morphological characteristics is unambiguously connected with the trajectory of the martensitic reaction assigned by the controlling wave process. In particular, for the orientation relationships between the phases involved in the transformation there was found an analytical dependence of the angle between the directions of close-packed atomic rows on the elastic properties of the initial bcc lattice. Quantitative estimates are given based on the values of the elastic moduli for bcc titanium. A discussion of the results obtained is conducted and special attention is paid to the new possibilities of experimental studies.
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Tài liệu tham khảo
M. P. Kashchenko and V. G. Chashchina, “Crystal Dynamics of BCC-HCP Martensitic Transformation: I. Controlling Wave Process,” Fiz. Met. Metalloved. 105(6), 571–577 (2008) [Phys. Met. Metallogr. 105, 537–543 (2008)].
W. G. Burgers, “On the Process of Transition of the Cubic-Body-Centered Modification into the Hexagonal-Closed-Packed Modification of Zirconium,” Physica A 1(7), 561–586 (1934).
M. P. Kashchenko, A. G. Semenovykh, and V. G. Chashchina, “Cryston Model of Formation of Strain-Induced α Martensite in Iron-Based Alloys,” Fiz. Mezomekh. 6(3), 37–56 (2003).
M. P. Kashchenko, V. V. Letuchev, L. A. Teplyakova, and T. N. Yablonskaya, “A Model of the Formation of Macroshear Bands and Strain-Induced Martensite with (hhl) Boundaries,” Fiz. Met. Metalloved. 82(4), 10–21 (1996) [Phys. Met. Metallogr. 82 (4), 329–336 (1996)].
M. P. Kashchenko, A. G. Semenovykh, and V. G. Chashchina, “A Cryston Model of the Formation of Shear Bands in Cubic Crystals with Random Grain-Boundaries,” Fiz. Mezomekh. 6(1), 95–122 (2003).
D. H. Kalantar, J. F. Belak, G. W. Collins, et al., “Direct Observation of the α-ε Transition in Shock-Compressed Iron via Nanosecond X-ray Diffraction,” Phys. Rev. Lett. 95, 075502 (2005).
M. P. Kashchenko, Wave Model of the Martensite Growth upon γ-α Transformation of Iron-Based Alloys (UIF Nauka, Ekaterinburg, 1993).
M. P. Kashchenko, “The Wave Model of Martensite Growth for the FCC-BCC Transformation of Iron-Based Alloys,” arXiv: cond-mat/0601569.
G. V. Kurdjumov, L. M. Utevskii, and R. I. Entin, Transformations in Iron and Steel (Nauka, Moscow, 1983) [in Russian].