Kinetics and morphology of deformation bands at the initial stage of the loss of a stable plastic flow in the 5456 alloy

Pleiades Publishing Ltd - Tập 2010 - Trang 881-888 - 2011
A. A. Shibkov1, A. E. Zolotov1, D. V. Mikhlik1, M. A. Zheltov1, A. V. Shuklinov1, V. A. Averkov1, A. A. Denisov1
1Tambov State University, Tambov, Russia

Tóm tắt

High-speed video filming is used to study the kinetics and morphology of the first deformation bands on the surface of the 5456 alloy having various initial microstructures. The mobility and morphology of the bands is found to change sharply after annealing in the vicinity of the solvus temperature. The dissolution of β(Al3Mg2) particles causes a transition from a plane into a branching morphology of the first bands and is accompanied by a sharp (almost an order of magnitude) increase in their mobility. The depinning of grain boundaries via the removal of β-phase particles is assumed to favor grain-boundary sliding, which causes branching of the bands.

Tài liệu tham khảo

J. F. Bell, Experimental Foundations of the Mechanics of Deformable Solids (Nauka, Moscow, 1984), Part 2, [in Russian]. A. Portevin and F. Le Chatelier, “Heat Treatment of Aluminum-Copper Alloys,” Trans. Am. Soc. for Steels Treating 5, 457–478 (1924). Y. Estrin and L. P. Kubin, “Spatial Coupling and Propagative Plastic Instabilities,” in Continuum Models for Materials with Microstructure, Ed. by H.-B. Muhlhaus (Wiley, New York, 1995), pp. 395–450. P. G. McCormick, “Theory of Flow Localization due to Dynamic Strain Aging,” Acta Metall. 36(12), 3061–3067 (1988). M. V. Markushev and M. Yu. Murashkin, “Structure and Mechanical Behavior of an Aluminum Alloy AMg6 after Severe Plastic Deformation and Annealing: 2. Mechanical Properties,” Fiz. Met. Metalloved. 92(1), 90–98 (2001) [Phys. Met. Metallogr. 92 (1), 85–93 (2001)]. A. A. Shibkov, A. A. Mazilkin, S. G. Protasova, et al., “Effect of the State of Impurities on the Serrated Deformation of the 5456 Alloy,” Deformatsiya i Razrushenie Materialov, No. 5, 24–32 (2008). A. A. Shibkov, A. A. Mazilkin, S. G. Protasova, et al., “Effect of Secondary-Phase Precipitates on the Serrated Deformation of an Aluminum-Magnesium 5456 alloy,” Deformatsiya i Razrushenie Materialov, No. 6, 12–17 (2008). B. A. Kolachev, V. I. Elagin, and V. A. Livanov, Physical Metallurgy and Heat Treatment of Nonferrous Metals and Alloys (MISiS, Moscow, 2001) [in Russian]. Physical Metallurgy of Aluminum and Its Alloys: A Handbook, Eds. by A. I. Belyaev, O. S. Bochvar, N. N. Buinov, et al. (Metallurgiya, Moscow, 1983) [in Russian]. I. I. Novikov, Theory of Heat Treatment of Metals (Metallurgiya, Moscow, 1978) [in Russian]. A. A. Shibkov, M. A. Zheltov, M. A. Lebedkin, et al., “Set of in Situ Methods for the Investigation of Serrated Plastic Deformation of Metals,” Zavod. Lab. 71(7), 20–27 (2005). S. Nebti, D. Hamana, and G. Cizeron, “Calorimetric Study of Pre-precipitation in Al-Mg Alloy,” Acta Metall. Mater. 43(9), 3583–3588 (1995). Y. Estrin, “Classification of Plastic Instabilities by Linear Stability Analysis,” Solid State Phenomena 3/4, 417–428 (1988). G. A. Malygin, “Thermal Mechanism of Unstable Deformation of Metals at Low Temperatures,” Fiz. Met. Metalloved. 63(5), 864–875 (1987). L. P. Kubin and Y. Estrin, “Evolution of Dislocation Densities and the Critical Conditions,” Acta. Mater. 38(5) (1990). P. Hähner, “On the Critical Condition of the Portevin-Le Chatelier Effect,” Acta Mater. 45(9), 3695–3707 (1997). H. Neuhäuser, F. B. Klose, F. Hagemann, et al., “On the PLC Effect in Strain-Rate and Stress-Rate Controlled Tests-Studies by Laser Scanning Extensometry,” J. Alloys and Compounds 378(1/2), 13–18 (2004). F. B. Klose, F. Hagemann, P. Hahner, and H. Neuhauser, “Investigation of the Portevin—Le Chatelier Effect in Al-3 wt % Mg Alloys by Strain-Rate and Stress-Rate Controlled Tensile Test,” Mat. Sci. Eng. A 387–389, 93–97 (2004). F. Chmelik, F. B. Klose, H. Dierke, et al., “Investigating the Portevin—Le Chatelier Effect in Strain Rate and Stress Rate Controlled Test by the Acoustic Emission and Laser Extensometry Techniques,” Mat. Sci. Eng. A 462, 53–60 (2007). H. Neuhauser, “Slip-Line Formation and Collective Dislocation Motion,” in Dislocation in Solids, Ed. by F. R. N. Nabarro (North-Holland Company, Amsterdam, 1983), pp. 319–440. A. Hampel and H. Neuhauser, “Investigation of Slip Line Growth in f. c. c. Cu Alloys with High Resolution in Time,” Phys. Stat. Sol. A 100(1), 441–449 (1987). E. Ben-Jacob and P. Garik, “The Formation of Patterns in Nonequilibrium Growth,” Nature. 343(8), 523–530 (1990). M. V. Markushev and M. Yu. Murashkin, “Strength and Cracking Resistance of Commercial Aluminum Alloys 1560 and 5083 of the Al-Mg-Mn System after Severe Plastic Deformation via Angular Pressing,” Fiz. Met. Metalloved. 98(2), 116–128 (2004) [Phys. Met. Metallogr. 98 (2), 816–928 (2004)]. V. N. Perevezentsev, “A Unified Approach to the Description of Diffusion in Equilibrium and Nonequilibrium Grain Boundaries,” Fiz. Met. Metalloved. 93(3), 1–4 (2002) [Phys. Met. Metallogr. 93 (3), 301–304 (2004)]. A. N. Orlov, V. N. Perevezentsev, and V. V. Rybin, Grain Boundaries in Metals (Metallurgiya, Moscow, 1980) [in Russian]. V. N. Perevezentsev, A. S. Pupynin, and Yu. V. Svirina, “Analysis of the Effect of Plastic Deformation on the Diffusion Properties of Grain Boundaries,” Fiz. Met. Metalloved. 100(1), 17–23 (2005) [Phys. Met. Metallogr. 100 (1), 717–723 (2005)]. B. M. Smirnov, Physics of Fractal Clusters (Nauka, Moscow, 1991) [in Russian]. Y. Shim, L. E. Levine, and R. Thomson, “Critical Behavior of Strain Percolation Model for Metals,” Phys. Rev. E 65, 046146 (2002).