Mechanisms of cavity formation and development during superplastic deformation of high-strength aluminum alloy 1933 with bimodal grain structure
Abstract
The mechanisms of cavity formation and growth during high-temperature superplastic deformation of high-strength aluminum
alloy 1933 with bimodal grain structure are considered. Superplastic deformation of the samples was performed at a temperature
Т = 520С, flow stress σ = 5,5 MPa, true strain rate = 1,2∙10-4 s-1. Samples of alloy 1933, superplastically deformed under such
conditions, by the time of fracture, accumulate deformation, the relative degree of which is 230%. It is shown that, in superplastically
deformed samples of alloy 1933, grain-boundary cavities originate due to the formation of wedge-shaped cracks at high-angle and lowangle
grain boundaries perpendicular to the fracture direction of samples, as well as due to the appearance of thin elongated microcracks at low-angle grain boundaries parallel to tension direction. It is revealed that cavities form and grow mainly due to the development of
grain boundary sliding. It takes place both at high-angle and low-angle grain boundaries, which are solid, or contain areas of viscous
liquid phase, which was formed as a result of partial melting of an alloy heated to a high homologous temperature. During the shape
changing and growth of grain-boundary cavities at the solid grain boundaries and at the boundaries of those grains that contain local
foci of the liquid phase formed as a result of partial melting of the 1933 alloy upon heating of its samples to the test temperature, fibrous
structures arise and grow due to the viscous flow of foci of the liquid phase. It has been revealed that all fibrous structures that were
formed in samples of the 1933 alloy during superplastic deformation can be conditionally divided into three types: type 1 – thin
cylindrical fibers; 2nd type – cone-shaped fibers; type 3 – fibers that have a ribbon-like view. It is shown that the localization of plastic
flow in ultrafine and coarse grains, of which the bridges between discontinuities in the microvolume of the sample, from which is
consist the most weakened due to the accumulation of cavities, lead to their failure. As a result, grain-boundary cavities and thin
elongated microcracks combine into a main crack, the development of which in the working part of the 1933 alloy sample in the
direction perpendicular to the tension direction leads to its destruction.
Downloads
References
V.I. Elagin, V.V. Zakharov, M.M. Drits. Structure and properties of alloys of the Al-Zn-Mg system, (Metallurgy, Moscow, 1982), 224p. [In Russian]
V.M. Beletsky, G.A. Krivov. Aluminum alloys (composition, properties, technology, application) (Коминтех, Кiev, 2005), 315p. [In Russian]
A.M. Zakharov. Industrial alloys of non-ferrous metals. (Metallurgy, Moscow, 1980), 256p. [In Russian]
K.A. Padmanabhan, R.A. Vasin, F.U. Enikeev. Springer Science & Business Media, 359 (2012).
Dong H. Shin, Kyung-Tae Park. Materials Science and Engineering. A268, 55 (1999).
H. Conrad, W.D. Cao, X.P. Lu, A.F. Sprecher. Materials Science and Engineering, A138, 247 (1991).
Jiang Xinggang, Cui Jianzhong, Ma Longxiang. Materials Science and Engineering, A157, 37 (1992).
M.G. Zelin, S. Guillard, Materials Science and Technology, Vol.15, 309 (1999).
C.L. Chen, M.J. Tan, Materials Science and Engineering, A298, 235 (2001).
C.L. Chen, M.J. Tan. Materials Science and Engineering, A338, 243 (2002).
Guangyu Li, Hua Ding, Jian Wang, Wenjing Zhang, Ning Zhang, Hongliang Hou. Materials Science And Technology, 35, 8, 939 (2019) 10.1080/02670836.2019.1597485.
M. Wang, H.Z. Guo, Y.J. Liu, Materials Science Forum, 551-552, 645 (2007).
Dong H. Shin, Kyung-Tae Park, Materials Science and Engineering, A268, 55 (1999).
Jiang Xinggang, Cui Jianzhong, Ma Longxiang, Materials Science and Engineering, A157, 37 (1992).
D.E. Pedun, V.P. Poyda, T.F. Sukhova, A.P. Samsonik, V.V. Litvinenko, E.L. Spiridonov, Visnik KhNU seria "Fizika", 1019, 16 63 (2012). [In Russian]
D.E. Pedun, V.P. Poyda, V.V. Bryukhovetsky, A.V. Poyda, A.P. Kryshtal, T.F. Sukhova, A.L. Samsonik, V.V. Litvinenko, E.A. Spiridonov, Metallophysics and advanced technologies, 34, 10, 1397 (2012). [In Russian]
V.P. Poyda, D.Ye. Pedun, V.V. Bryukhovetskiy, A.V. Poyda, R.V. Sukhov, A.L. Samsonik, V.V. Litvinenko. Fizika metallov i metallovedeniye, 114, 9, 848 (2013) [In Russian]
A.V. Poyda, V.P. Poyda, V.V. Bryukhovetskiy, D.E. Mila, A.V. Zavdovev, Metallophysics and advanced technologies. 39, 10, 1345 (2017). [In Russian]
V.V. Bryukhovetsky, A.V. Poyda, V.P. Poyda, D.E. Milaya, Problems of atomic science and technology, Series “Physics of Radiation Effect and Radiation Materials Science”, №2, 94 (2018).
A.V. Poida, A.V. Zavdoveev, V.P. Poida, V.V. Bryukhovetskyy, D.E. Mylaya, Reports of the NAS of Ukraine, 2 54 (2016). [in Ukrainian]
V.P. Poyda, Metallophysics and advanced technologies, 12, 1, 44 (1990). [in Russian]
S.A. Saltykov. Stereometric metallography. (Metallurgy, Moscow, 1976), 272 p. [in Russian]
А.М. Wasserman, W.A. Danilkin, O.S. Korobov et al. Methods of control and research of light alloys: Handbook. (Metallurgy, Moscow, 1985), 510p. [in Russian]
M. Beckert, H. Klemm. Methods of metallographic etching: Ref. ed. (Metallurgy, Moscow, 1988), 400p. [in Russian]
M.E. Dritz, N.R. Bochvar, E.S. Kander et al. State diagrams of systems based on aluminum and magnesium. Directory. (Science, Moscow, 1977), 226p. [in Russian]
L.F. Mondolfo. Structure and properties of aluminum alloys. (Metallurgy, Moscow, 1979), 640p. [in Russian]
L.I. Mirkin. Handbook of X-ray diffraction analysis of polycrystals (St. Publ. House of Phys. and Math. Literature, Moscow, 1963), 864p. [in Russian]
I.I. Novikov, V.S. Zolotarevskyy. Dendritic liquation in alloys. (Science, Moscow, 1966), 155p. [in Russian]
V.S. Zolotarevskyy, Structure and strength of cast aluminum alloys. (Metallurgy, Moscow, 1981), 192p. [in Russian]
N.S. Gerchikova. Fine structure and stress corrosion cracking of aluminum alloys (Metallurgy, Moscow, 1982), 128p. [in Russian]
Y. Takayama, T. Tozawa, H. Kato, Acta Mater, 47, 4. 1263 (1999).
M. Mabuchi, H.G. Jeong, K. Hiraga, K. Higashi, Interface Sci, 4, 3-4, 357 (1996).
V.P. Poyda, D.Ye. Milaya, A.V. Poyda, V.V. Bryukhovetskiy, R.V. Sukhov. Problems of atomic science and technology, Series “Physics of Radiation Effect and Radiation Materials Science”, 4 (92), 139 (2014).
I.I. Novikov. Hot brittleness of non-ferrous metals and alloys. (Science, Moscow, 1966), 299p. [in Russian]
M.V. Maltsev, Yu.D. Chistyakov, M.I. Tsyping. DAN USSR, 49, 5, 813 (1954).
V.I. Dobatkin, R.M. Gabidullin, B.A. Kolachev, G.S. Makarov. Gases and oxides in wrought aluminum alloys. (Metallurgy, Moscow, 1976), 264p. [in Russian]
D.E. Myla, V.V. Bryukhovetsky, V.V. Lytvynenko, V.P. Poyda, A.V. Poyda, V.F. Klepikov, V.T. Uvarov, Yu.F. Lonin, А.G. Ponomarev, Problems of Atomic Science and Technology, 2 (126), 33 (2020).
A.M. Korolkov. Casting properties of metals and alloys. (Science, Moscow, 1967), 199p. [in Russian]
R.I. Kuznetsova, V.V. Bryukhovetskiy, V.P. Poyda, T.F. Sukhova, Metallophysics and advanced technologies, 17, 8, 64 (1995). [in Russian]
V.P. Poyda, V.V. Bryukhovetskiy, R.I. Kuznetsova, A.V. Poyda, V.F. Klepikov, Metallophysics and advanced technologies, 25, 1, 117 (2003). [in Russian]
V.P. Poyda, V.V. Bryukhovetskiy, A.V. Poyda, R.I. Kuznetsova, V.F. Klepikov, D.L. Voronov, Physics of Metals and Metallography, 103, 4, 433 (2007). [in Russian]
D.Ye. Pedun, V.P. Poyda, V.V. Bryukhovetskiy, A.V. Poyda, R.V. Sukhov, A.P. Kryshtal'. Visnik KhNU seria "Fizika", 1075, 18, 55 (2013).
3.gif){kind=logo}
