A. R. Kuznetsov, S. A. Starikov, V. V. Sagaradze
PHONON INSTABILITIES IN A METAL ON THE BAIN FCC–BCC TRANSFORMATION PATH
DOI: 10.17804/2410-9908.2022.6.086-094 In this paper, the energy of the Bain path in Al and the instability of phonons during uniaxial compression deformation along <001> are studied ab initio. It is shown that, at a strain of about 15%, dynamic loss of structure stability is observed due to short-wavelength phonons, which thus determine the theoretical strength of Al. Deformation causes shifts along the {111} planes of the initial fcc cell, leading to the formation of stacking faults. A similar formation of stacking faults was observed in [1] in the framework of simulation of compression along the <001> Ni3Al nanoparticle (L12 superstructure based on the fcc structure). The results obtained can be applied to situations in the experiment, when small defect-free regions are deformed, for example, as in nanostructured materials and during nanoindentation.
Acknowledgments: The work was performed under the state assignment from the Russian Ministry of Education and Science, theme Structure, No. 122021000033-2. The calculations were made with the use of the Uran supercomputer, IMM UB RAS. Keywords: first-principle calculation, Bain deformation, phonon spectrum, structure stability References:
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Article reference
Kuznetsov A. R., Starikov S. A., Sagaradze V. V. Phonon Instabilities in a Metal on the Bain Fcc–bcc Transformation Path // Diagnostics, Resource and Mechanics of materials and structures. -
2022. - Iss. 6. - P. 86-94. - DOI: 10.17804/2410-9908.2022.6.086-094. -
URL: http://eng.dream-journal.org/issues/2022-6/2022-6_385.html (accessed: 11/03/2024).
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