Research ArticleOpen AccessGoogle Scholar indexed
Microstructural Evolution in Cu-Mg Alloy Processed by Conform
School of Materials Science and Engineering, Central South University, Changsha, China
School of Materials Science and Engineering, Central South University, Changsha, China;China Railway Construction Electrification Bureau Group Kang Yuan New Materials Co., LTD., Jiangyin, China
School of Materials Science and Engineering, Central South University, Changsha, China
- 1 School of Materials Science and Engineering, Central South University, Changsha, China
- 2 School of Materials Science and Engineering, Central South University, Changsha, China;China Railway Construction Electrification Bureau Group Kang Yuan New Materials Co., LTD., Jiangyin, China
- 3 School of Materials Science and Engineering, Central South University, Changsha, China
International Journal of Nonferrous Metallurgy·Volume 02 (2013)·Pages 100–105·Published 3 July 2013·DOI10.4236/ijnm.2013.23014
Copy link · social · email
Abstract
The objective of this study is to investigate the possibility of continuous extrusion forming (Conform process) and microstructural evolution the of Cu-Mg alloy. The results indicate that Conform process can break as-cast grains and refine the structure, meanwhile. This process can improve the degree of the structure homogeneity. The TEM and EBSD techniques were used to investigate the morphology, grain size and misorientation of the samples at cavity entrance and cavity export. Refined structures after shear deformation include broken grains and subgrains formed by dislocation reconstruction. Due to the relatively high deformation temperature, dynamic recrystallization occurred during deformation. The subgrain rotation nucleation took place, and grain boundary migration resulted in grain growth. However, the coarse grains were refined by anneal twins.
KeywordsCu-Mg AlloyMicrostructural EvolutionConformDynamic Recrystallization
- C. Etherington, “CONFORM—A New Concept for the Continuous Extrusion Forming of Metals,” Transactions of the American Society of Mechanical Engineers, Journal of Engineering for Industry, Vol. 96B, No. 3, 1974, pp. 893-900.
- S. Harper, “Special Extrusion Processes for Non-Ferrous Metals,” The Metallurgist and Materials Technologist, Vol. 12, No. 5, 1980, pp. 257-260.
- T. Reinikainen, A. S. Korhonen, K. Anderson and S. Kivivuori, “Computer-Aided Modelling of a New Copper Extrusion Process,” Annals of CIRP, Vol. 42, No. 1, 1993, pp. 265-268. doi:10.1016/S0007-8506(07)62440-8
- D. Green, “Continuous Extrusion-Forming of Wire Section,” Journal of the Institute of Metals (London), Vol. 100, 1972, pp. 295-300.
- C. Etherington, “Continuous Extrusion Forming of Metals,” Transactions of the American Society of Mechanical Engineers, Series B, Vol. 96, No. 3, 1968, pp. 893-900.
- Z. Horita, T. Fujinami, M. Nemoto and T. G. Langdon, “Improvement of Mechanical Properties for Al Alloys Using Equal-Channel Angular Pressing,” Journal of Materials Processing Technology, Vol. 117, No. 3, 2001, pp. 288-292. doi:10.1016/S0924-0136(01)00783-X
- W. Z. Han, S. D. Wua, S. X. Li and Y. D. Wang, “Intermediate Annealing of Pure Copper during Cyclic Equal Channel Angular Pressing,” Materials Science and Engineering A, Vol. 483-484, 2008, pp. 430-432. doi:10.1016/j.msea.2006.10.179
- A. Azushima, R. Kopp, A. Korhonen, D. Y. Yang and F. Micari, “Severe Plastic Deformation (SPD) Processes for Metals,” CIRP Annals: Manufacturing Technology, Vol. 57, 2008, pp. 716-735. doi:10.1016/j.cirp.2008.09.005
- A. Mishra, V. Richard, F. Grégori, R. J. Asaro and M. A. Meyers, “Microstructural Evolution in Copper Processed by Severe Plastic Deformation,” Materials Science and Engineering A, Vol. 410-411, 2005, pp. 290-298. doi:10.1016/j.msea.2005.08.201
- M. Kawasakia, Z. Horitab and T. G. Langdona, “Microstructural Evolution in High Purity Aluminum Processed by ECAP,” Materials Science and Engineering A, Vol. 524, No. 1-2, 2009, pp. 143-150. doi:10.1016/j.msea.2009.06.032
- A. A. Gazder, F. Dalla Torre, C. F. Gu, C. H. J. Davies and E. V. Pereloma, “Microstructure and Texture Evolution of bcc and fcc Metals Subjected to Equal Channel Angular Extrusion,” Materials Science and Engineering A, Vol. 415, No. 1-2, 2006, pp. 126-139. doi:10.1016/j.msea.2005.09.065
- I. V. Alexandrov and R. Z. Valiev, “Nanostructures from Severe Plastic Deformation and Mechanisms of LargeStrain Work Hardening,” Nanostructured Materials, Vol. 12, No. 5-8, 1999, pp. 709-712. doi:10.1016/S0965-9773(99)00223-8