2017-Sustainable Industrial Processing Summit
SIPS 2017 Volume 5. Marquis Intl. Symp. / New and Advanced Materials and Technologies
| Editors: | Kongoli F, Marquis F, Chikhradze N |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2017 |
| Pages: | 590 pages |
| ISBN: | 978-1-987820-69-0 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
CD shopping page
Characterization of Inhomogeneous Microstructure of Ultrafine Grained Magnesium
Qizhen Li1; Xing Jiao2;1WASHINGTON STATE UNIVERSITY, Pullman, United States; 2, , ;
Type of Paper: Keynote
Id Paper: 154
Topic: 43
Abstract:
Magnesium is the lightest structural metal and its low density makes it highly attractive for automobile and aerospace industries. The usage of light weight magnesium based components in cars and airplanes can reduce the weight of these transportation vehicles and improve the fuel efficiency. To broaden the practical applications of magnesium, it is often needed to refine the material's microstructure and thus improve its mechanical properties. Among the various processing techniques for refining the microstructure of magnesium, equal channel angular pressing (ECAP) is one of the most widely used techniques. In this study, commercially pure magnesium was processed using a series of ECAP cycles and the cross-section planes of the ultrafine grained samples were observed to explore qualitatively the microstructure evolution and inhomogeneity generated through the processing. The observation shows that a large number of deformation twins were generated in most of the grains, shear bands and the breakdown of grains were observed in some portion of the sample, and there was more severe deformation for the part of the sample that travelled along the inner surface of the mold channel.
Keywords:
New and advanced materials; New and advanced technology;References:
[1] M. Avedesian and H. Baker, Magnesium and Magnesium Alloys, Materials Park, OH: ASM International, 1999.[2] E.O. Hall, The deformation and ageing of mild steel: III Discussion of results, Proc. Phys. Soc. B 64, 747 (1951).
[3] N.J. Petch, The cleavage strength of polycrystals, J. Iron Steel Institute 174, 25 (1953).
[4] Q.Z. Li and B. Tian, Mechanical properties and microstructure of pure polycrystalline magnesium rolled by different routes, Materials Letters 67, 81 (2012).
[5] X. Jiao and Q.Z. Li, An observation about global microstructure of ECAPed magnesium, Emerging Materials Research 3, 261 (2014).
[6] A. Ma, J. Jiang, N. Saito, I. Shigematsu, Y. Yuan, D. Yang, and Y. Nishida, Improving both strength and ductility of a Mg alloy through a large number of ECAP passes, Materials Science and Engineering A 513-514, 122 (2009).
[7] R. Lapovok, P.F. Thomson, R. Cottam, and Y. Estrin, The effect of grain refinement by warm equal channel angular extrusion on room temperature twinning in magnesium alloy ZK60, Journal of Materials Science 40, 1699 (2005).
[8] D. Zhang and S. Li, Orientation dependencies of mechanical response, microstructure and texture evolution in hot compression of AZ31 magnesium alloy processed by equal channel angular extrusion, Materials Science and Engineering A 528, 4982 (2011).