THE LATTICE PARAMETERS AND RESIDUAL STRESSES IN BULK NANOCRYSTALLINE AND ULTRAFINE-GRAINED TITANIUM
Keywords:
lattice parameters, residual stresses, bulk nanocrystalline/ultrafine-grained titanium, X-ray diffraction, cryoreduction
Abstract
Lattice parameters and residual stresses in the bulk nanocrystalline/ultrafine-grained titanium were studied by X-ray diffraction methods. The investigated samples were prepared using the method of the cryomechanical grain structure fragmentation with multiple rolling at the temperature of liquid nitrogen to the true strain value |e| = 3. Phasic change of the a and c parameters has been found with increasing degree of cryoreduction. This change was stronger for the parameter a. The observed change parameters associated with a relative slip and twinning activity (initial cryo-reduction stage) as well as the formation of the nanocrystalline state (at higher degree of deformation). The most likely source of residual stresses arising in titanium at cryorolling is heterogeneous plastic deformation. The production of nanocrystalline / ultrafine-grained titanium using cryomechanical grain fragmentation method is accompanied by the formation of uniform compressive residual stresses in the informative deformable layer of billet.
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References
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8. Noyan I.C., Cohen J.B. An X-ray diffraction study of the residual stress-strain distributions in shot-peened two-phase brass // Mater. Sci. Eng. – 1985. – Vol. 75. – P. 179-193.
9. De los Rios E.R., Walley A., Milan M.T., Hammersley G. Fatigue crack initiation and propagation on shot-peened surfaces in A316 stainless steel // Int. J. Fatigue. – 1995. – Vol. 17. – P. 493–499.
10. Wu T., Hartley C.S., Wang X.M., Tsai C.T. Residual stress distribution in cold rolled brass sheet // J. Mater. Process. Technol. – 1994. – Vol. 45. – P. 111-116.
11. Gladkikh L.I., Malykhin S.V., Pugachev A.T. Difraktsionnyye metody analiza vnutrennikh napryazheniy. Teoriya i eksperiment: Ucheb. Posobiye [Diffraction methods for analysis of internal stresses. Theory and experiment: Handbook]. - Khar'kov: NTU «KHPI», 2006. – 304p. (In Russian)
12. Tsvikker U. Titan i yego splavy [Titanium and its alloys]. – Moskva: Metallurgiya, 1979. – 512p. (In Russian)
13. Friedel J. Dislocations. – Moskva: Mir, 1967. – 600 s.
14. Moskalenko V.A., Betekhtin V.I., Kardashev B.K., Kadomtsev A.G., Smirnov A.R., Smolyanets R.V., Narykova V.V. Mechanical properties and Structures of Nanocrystalline titanium produced by cryorolling // Physics Solid State. – 2014. – Vol. 56. – No. 81. – P. 1590-1596.
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16. Tablicy fizigheskih velichin [Tables of physical quantities.]. Ed. Akad. I.К. Кikoin. - М.: Аtomizdat, 1976. – 1008p. (in Russian)
17. Moskalenko V.A., Smirnov A.R., Smolianets R.V. Low-temperature plastic deformation and strain-hardening of nanocrystalline titanium // Low Temp. Phys. - 2014. – Vol. 40. - P.837 - 845.
Published
2017-05-13
Cited
How to Cite
Plotnikova, Y. M., Smolianets, R. V., Braude, I. S., & Moskalenko, V. A. (2017). THE LATTICE PARAMETERS AND RESIDUAL STRESSES IN BULK NANOCRYSTALLINE AND ULTRAFINE-GRAINED TITANIUM. East European Journal of Physics, 4(1), 56-61. https://doi.org/10.26565/2312-4334-2017-1-04
Section
Original Papers
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