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Acta Metall Sin  2009, Vol. 45 Issue (5): 597-604    DOI:
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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
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Abstract  

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.

Key words:  Cu–Al2O3 alloy      high temperature deformation      constitutive equation      dynamic recovery      dynamic recrystallization     
Received:  15 October 2008     
ZTFLH: 

TG111.7

 
  TG146.11

 
Fund: 

Supported by National High Technical Research and Development Program of China (Nos.2002AA302505 and 2006AA03Z517)

Corresponding Authors:  SHEN Kun     E-mail:  shenkun220@yahoo.com.cn

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.

URL: 

https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y2009/V45/I5/597

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