Acta Metallurgica Sinica (English Letters) ›› 2009, Vol. 22 ›› Issue (2): 110-116.DOI: 10.1016/S1006-7191(08)60077-0

• Research paper • Previous Articles     Next Articles

Study on the hot deformation behavior of Al-Zn-Mg-Cu-Cr aluminum alloy during multi-stage hot compression

Gaoyong LIN,Xiaoyan ZHENG,Wei YANG, Di FENG,Dashu PENG   

  1. School of Materials Science and Engineering, Central South University, Changsha 410083, China
  • Received:2008-06-13 Revised:2008-09-18 Online:2009-04-25 Published:2009-10-10
  • Contact: Xiaoyan ZHENG

Abstract:

The mechanical behavior and microstructures of an Al-Zn-Mg-Cu-Cr aluminum alloy during multi-stage hot deformation were investigated by thermal stimulation test, optical microscopy, and transmission electron microscopy. The true stress vs true strain curves and the microstructure evolution of two hot deformation procedures were gained. The flow stress of the alloy studied decreases with increasing the deforming passes and declining the temperature, and the larger the temperature decline between adjacent stages, the larger the peak stress fall is. The stress-strain behavior mainly result from the dynamic recovery during deformation, the static recovery and re-crystallization in the delay time, and the second phases precipitated from the matrix at high temperature.

Key words: Al-Zn-Mg-Cu-Cr alloy, Multi-stage compression, Flow stress and peak stress, Micro-structure evolution