Abstract
The effect of equal-channel angular pressing and high-pressure torsion on the formation of an ultrafine-grained structure in commercially pure tungsten has been studied. The structure was tested by the methods of transmission and scanning electron microscopy using electron backscatter diffraction analysis. The material microhardness depending on the stored deformation has been evaluated. In the samples subjected to severe plastic deformation, the quantitative structure characteristics (the average size of grains/subgrains and misorientation-angle distribution) have been determined.
Similar content being viewed by others
References
R. Z. Valiev, R. K. Islamgaliev, and I. V. Alexandrov, “Bulk nanostructured materials from severe plastic deformation,” Prog. Mater. Sci., 45, 103–189 (2000).
R. Z. Valiev and T. G. Langdon, “Principles of equalchannel angular pressing as a processing tool for grain refinement,” Prog. Mater. Sci., 51, 881–981 (2006).
Q. Wei, T. Jiao, and K. T. Ramesh, “Mechanical behavior and dynamic failure of high-strength ultrafine grained tungsten under uniaxial compression,” Acta Mater., 54, 77–87 (2006).
Q. Wei, H. T. Zhang, and B. E. Schuster, “Microstructure and mechanical properties of super-strong nanocrystalline tungsten processed by high-pressure torsion,” Acta Mater., 54, 4079–4089 (2006).
I. V. Aleksandrov, A. R. Kil’mametov, and R. Z. Valiev, “X-ray diffraction studies of ultrafine-grained metals produced by equal-channel angular pressing,” Russ. Metall. (Metally) 1, 52–59 (2004).
A. P. Zhilyaev and T. G. Langdon, “Using high-pressure torsion for metal processing: Fundamentals and applications,” Prog. Mater. Sci. 53, 893–979 (2008).
F. J. Humphreys, “Characterization of fine-scale microstructures by electron backscatter diffraction (EBSD),” Scr. Mater., 51, 771–776 (2004).
S. Yu. Mironov, V. N. Danilenko, and M. M. Myshlyaev, “Analysis of the spatial orientation distribution of building blocks in polycrystals as determined using transmission electron microscopy and a backscattered electron beam in a scanning electron microscope,” Phys. Solid State 47, 1258–1266 (2005).
V. V. Rybin, Large Plastic Deformations and Fracture of Metals (Metallurgiya, Moscow, 1986) [in Russian].
V. E. Panin, Yu. V. Grinyaev, V. I. Danilov, L. B. Zuev, C. E. Egorushkin, T. F. Elsukova, M. A. Koneva, E. V. Kozlov, T. M. Poletika, S. N. Kul’kov, S. G. Psakhie, S. T. Korostelev, and P. V. Chertova, Structural Levels of Plastic Deformation and Fracture (Nauka, Novosibirsk, 1990) [in Russian].
R. K. Islamgaliev and R. Z. Valiev, “Electron-microscopic investigation of elastic deformations near grain boundaries in ultrafine-grained copper,” Phys. Met. Metallogr. 87, 215–220 (1999).
N. Krasilnikov, W. Lojkowski, Z. Pakiela, and R. Valiev, “Tensile strength and ductility of ultrafine-grained nickel processed by severe plastic deformation,” Mater. Sci. Eng., A, 397, 330–337 (2005).
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text © A.V. Ganeev, R.K. Islamgaliev, R.Z. Valiev, 2014, published in Fizika Metallov i Metallovedenie, 2014, Vol. 115, No. 2, pp. 149–155.
Rights and permissions
About this article
Cite this article
Ganeev, A.V., Islamgaliev, R.K. & Valiev, R.Z. Refinement of tungsten microstructure upon severe plastic deformation. Phys. Metals Metallogr. 115, 139–145 (2014). https://doi.org/10.1134/S0031918X14020070
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S0031918X14020070