Paper Titles
Synthesis Behavior of La0.7Ca0.3MnO3 by Hydrothermal Method
p.703
Melting Liquid Joint Method of Ti(Cu)-Base Bulk Metallic Glassy Alloy
p.707
Y-Shaped Carbon Nanowires Obtained from Ethanol Flames and their Growth Mechanism
p.711
Comparison between Tribological Characteristics of Al-Cu-Fe-B Quasicrystalline and Mo Coatings
p.715
Upsetting of Ultrafine-Grained Bulk Al-Mg Alloy Consolidated by Hydrostatic Extrusion
p.719
Glass Transition within the Cluster Variation Approximation
p.723
Carbon Nanotubes Obtained by ECC Technique with Cobalt Salt as Catalyst Precursor
p.727
Synthesis of Carbon Nanofibers by Ethanol Catalytic Combustion Technique
p.731
The Influence of Catalyst Nature on the Morphology of Multi-Directionally Grown Carbon Nanofibers
p.735

Upsetting of Ultrafine-Grained Bulk Al-Mg Alloy Consolidated by Hydrostatic Extrusion

Article Preview

Abstract:

Deformation characteristics and forming limit of ultrafine-grained bulk Al-Mg alloy were examined with upsetting process. The Al-7.5%Mg alloy produced by cryogenic milling and HIP was subjected to hot hydrostatic extrusion as a final consolidation in fabricating the ultrafine-grained bulk material. Upsetting was performed to study their mechanical characteristics in a practical forming process. The extruded specimen showed that the pores remained in spite of the HIP had been collapsed and almost eliminated. The effective removal of the distributed pores resulted in significant increase of formability by preventing early cracking. Metallographic investigations showed that the size of grain remained below a few hundred nanometer scale in the processes.

You might also be interested in these eBooks
Advanced Materials and Processing View Preview

Info:

Periodical:

Advanced Materials Research (Volumes 26-28)

Pages:

719-722

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.26-28.719

Citation:

Cite this paper

Online since:

October 2007

Authors:

E.Z. Kim, Soo Ik Oh, Sang Mok Lee, C.Y. Yoon, Hoon Jae Park, Seung Soo Kim, Tae Hoon Choi, Kyoung Hoan Na

Keywords:

Bimodal Structure, Consolidation, Cryogenic Mechanical Milling, Hydrostatic Extrusion (HE), Ultrafine Grained Material, Upsetting

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

© 2007 Trans Tech Publications Ltd. All Rights Reserved

Share:

Citation:

References

[1] M. Yu. Gutkin, I. A. Ovid'ko: Plastic Deformation in Nanocrystalline Materials (Springer- Verlag, Berlin 2004).

Google Scholar

[2] Y. Wang, M. Chen, F. Zhou, and E. Ma: Nature, Vol. 419 (2002), p.912.

Google Scholar

[3] R. Valiev: Nature Materials, Vol. 3 (2004), p.511.

Google Scholar

[4] C. Suryanarayana: Mechanical Alloying and Milling (Marcel Dekker, New York 2004).

Google Scholar

[5] D. B. Witkin, and E. J. Lavernia: Progress in Materials Science, Vol. 51 (2006), p.1.

Google Scholar

[6] S. Lee, C. Y. Yoon, H. J. Park, S. S. Kim, E. Z. Kim, T. H. Choi, and K. Y. Rhee: Journal of Materials Processing Technology, Vol. 191, Issues 1-3, (2007), p.396. 200㎛㎛㎛㎛ 200㎛㎛㎛㎛ (a) (b).

Google Scholar