STUDY ON HIGH TEMPERATURE DEFORMATION CHARACTERISTICS OF Cu–0.23%Al2O3 DISPERSION–STRENGTHENED COPPER ALLOY
SHEN Kun 1; WANG Mingpu 1; GUO Mingxing 2; LI Shumei 1
1) School of Materials Science and Engineering; Central South University; Changsha 410083
2) Laboratory for Mechanical Metallurgy; Institut des Mat´eriaux; Ecole Polytechnique F´ed´erale de Lausanne (EPFL);
Lausanne; Switzerland
Cite this article:
SHEN Kun WANG Mingpu GUO Mingxing LI Shumei . STUDY ON HIGH TEMPERATURE DEFORMATION CHARACTERISTICS OF Cu–0.23%Al2O3 DISPERSION–STRENGTHENED COPPER ALLOY. Acta Metall Sin, 2009, 45(5): 597-604.
In order to deeply understand the high temperature deformation behaviors of Cu–0.23%Al2O3 (volume fraction) alloy, the changes of flow stress and microstructure for this alloy after deformation at high temperatures were investigated by using the Gleeble–1500 hot simulator, metallographic microscope and transmission electron microscope. The results show that the flow stress will change significantly with the thermal compression conditions and is mainly divided into three different stages. In addition, the average activation energy and other material parameters of this alloy deformed at high temperatures were obtained, based on them, the constitutive equation of the peak value yield stress–strain rate–temperature was also established. With increasing of compression temperature, the size and number of dynamic recrystallization grains are increased. However in the case of isothermal compression, with increasing of strain rates, the evolution of metallographical microstructures becomes disequilibrium, the size of subgrain is gradually decreased to about 0.5—1 μm, and the dislocation density is increased at first, and then decreased.
[1] Lee J, Kim Y C, Lee S, Ahn S H, Kim N J. Metall Mater Trans, 2004; 35A: 493
[2] Guo M X, Wang M P, Li Z, Cao L F, Cheng J Y. Mater Mech Eng, 2005; 29(4): 1
(郭明星, 汪明朴, 李周, 曹玲飞, 程建奕. 机械工程材料, 2005; 29(4): 1)
[3] Perez J E, Morris D G. Scr Metall Mater, 1994; 31: 231
[4] Shi Z Y, Wang D Q. J Mater Sci Lett, 1998; 17: 477
[5] Rajkovic V M, Mitkov M V. Int J Powder Metall, 2000; 36: 45
[6] Guo M X, Wang M P, Shen K, Cao L F, Li Z, Zhang Z. J Alloys Compd, 2008; 460: 585
[7] Poul B, Kapoor R, Chakrararty J K, Bidaye A C, Sharma I G, Suri A K. Scr Mater, 2009; 60: 104
[8] Guo M X, Wang M P, Cao L F, Lei R S. Mater Charact, 2007; 58: 928
[9] Jonas J J, Sellars C M, Tegart W J M. Strength and Structure Under Hot–Working Conditions. London: Iron and Steel Institute, 1968: 49
[10] Poirier J P, translated by Guan D L. Plastic Deformation of Crystal at High Temperature. Dalian: Dalian Science and Technology University Press, 1989: 11
(Poirier J P著, 关德林译. 晶体高温塑性变形. 大连: 大连理工大学出版社, 1989: 11)
[11] Broyles S E, Anderson K R, Groza J R, Gibeling J C. Metall Mater Trans, 1996; 27A: 1217
