Grain Refinement Efficiency of Multi-Axial Incremental Forging and Shearing: A Crystal Plasticity Analysis

Document Type : Research Paper

Authors

1 School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, P.O. Box 11155-4563, Tehran, Iran

2 Center of Excellence for High Performance Materials, School of Metallurgy and Materials Engineering, University of Tehran, Tehran, Iran

3 Advanced Metal forming and Thermomechanical Processing Laboratory, School of Metallurgy and Materials Engineering, University of Tehran, Tehran, Iran

Abstract

Severe plastic deformation is a technical method to produce functional material with special properties such as high strength and specific physical properties. Selection of an efficient severe plastic deformation for grain refinement is a challenging field of study and using a modeling technique to predict the refinement efficiency has gained a lot of attentions. A comparative study was carried out on the grain refinement ability of two severe plastic deformation techniques. Accordingly, beta-tin samples were processed for almost the same strain level by the equal channel angular extrusion (ECAE) and the newly developed multi-axial incremental forging and shearing (MAIFS). Optical microscope and tensile tests were used to investigate the microstructure and mechanical properties. It was found that the MAIFS process is more efficient in grain refinement than ECAE by help of crystal plasticity analysis and experimental observation. This was ascribed to the more activated slip systems in MAIFS than ECAE and activation of secondary modes of deformation in MAIFS. The conclusion was supported by the finer grains that was observed in the sample processed by MAIFS and compared with grain size of the sample processed by ECAE. Finally, these observations were related to materials flow for beta-Tin during tensile test.

Keywords

References

1. Valiev RZ, Estrin Y, Horita Z, Langdon TG, Zechetbauer MJ, Zhu YT. Producing bulk ultrafine-grained materials by severe plastic deformation. Jom. 2006;58(4):33-9.
2. Estrin Y, Vinogradov A. Extreme grain refinement by severe plastic deformation: a wealth of challenging science. Acta materialia. 2013;61(3):782-817.
3. Beyerlein IJ, Lebensohn RA, Tome CN. Modeling texture and microstructural evolution in the equal channel angular extrusion process. Materials Science and Engineering: A. 2003;345(1):122-38.
4. Segal VM. Equal channel angular extrusion: from macromechanics to structure formation. Materials Science and Engineering: A. 1999;271(1):322-33.
5. Valiev RZ, Langdon TG. Principles of equal-channel angular pressing as a processing tool for grain refinement. Progress in Materials Science. 2006;51(7):881-981.
6. Toth LS, Gu C. Ultrafine-grain metals by severe plastic deformation. Materials Characterization. 2014 Jun 30;92:1-4.
7. Langdon TG. Twenty-five years of ultrafine-grained materials: achieving exceptional properties through grain refinement. Acta Materialia. 2013;61(19):7035-59.
8. Furukawa M, Iwahashi Y, Horita Z, Nemoto M, Langdon TG. The shearing characteristics associated with equal-channel angular pressing. Materials Science and Engineering: A. 1998;257(2):328-32.
9. Iwahashi Y, Horita Z, Nemoto M, Langdon TG. The process of grain refinement in equal-channel angular pressing. Acta Materialia. 1998;46(9):3317-31.
10. Gholinia A, Prangnell PB, Markushev MV. The effect of strain path on the development of deformation structures in severely deformed aluminium alloys processed by ECAE. Acta Materialia. 2000;48(5):1115-30.
11. Iwahashi Y, Wang J, Horita Z, Nemoto M, Langdon TG. Principle of equal-channel angular pressing for the processing of ultra-fine grained materials. Scripta Materialia. 1996;35(2):143-6.
12. Zhu YT, Lowe TC. Observations and issues on mechanisms of grain refinement during ECAP process. Materials Science and Engineering: A. 2000;291(1):46-53.
13. Li S. A crystal plasticity-based explanation for the dependencies of grain refinement on processing route and die angle in equal channel angular extrusion. Scripta Materialia. 2009;60(8):706-9.
14. Li S, Beyerlein IJ, Alexander DJ, Vogel SC. Texture evolution during multi-pass equal channel angular extrusion of copper: neutron diffraction characterization and polycrystal modeling. Acta materialia. 2005;53(7):2111-25.
15. Li S, Beyerlein IJ, Alexander DJ. Characterization of deformation textures in pure copper processed by equal channel angular extrusion via route A. Materials Science and Engineering: A. 2006;431(1):339-45.
16. Suwas S, Arruffat-Massion R, Tóth LS, Eberhardt A, Fundenberger JJ, Skrotzki W. Evolution of crystallographic texture during equal channel angular extrusion of copper: the role of material variables. Metallurgical and Materials Transactions A. 2006;37(3):739-53.
17. Montazeri‐Pour M, Parsa MH, Khajezade A, Mirzadeh H. Multi‐Axial Incremental Forging and Shearing as a New Severe Plastic Deformation Processing Technique. Advanced Engineering Materials. 2015;17(8):1197-207.
18. Montazeri-Pour M, Habibi-Parsa M. A novel severe plastic deformation process for shear deformation and grain refinement of bulk materials. Advanced Materials Research. 2014;829:15-19.
19. Klarstrom D, Wu J. Metallography and microstructures of cobalt and cobalt alloys. Materials Park, OH: ASM International, 2004:762-74.
20. Malvern LE. Introduction to the Mechanics of a Continuous Medium. 1969.
21. Toth LS. Texture evolution in severe plastic deformation by equal channel angular extrusion. Advanced Engineering Materials. 2003;5(5):308-16.
22. Lebensohn RA, Tomé CN. A self-consistent anisotropic approach for the simulation of plastic deformation and texture development of polycrystals: application to zirconium alloys. Acta metallurgica et materialia. 1993;41(9):2611-24.
23. Mahmudi R, Mhjoubi H, Mehraram P. Superplastic indentation creep of fine-grained Sn-1% Bi alloy. International Journal of Modern Physics B. 2008;22(18n19):2823-32.
24. Toman K, Simerská M. The deformation texture of β-tin I. Compression texture. Cechoslovackij fiziceskij zurnal. 1958;8(1):94-99.
Journal of Ultrafine Grained and Nanostructured Materials
Volume 49, Issue 1
June 2016
Pages 11-16

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History

  • Receive Date: 27 February 2016
  • Revise Date: 22 June 2016
  • Accept Date: 30 May 2016

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