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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 15    No. 4    August 2005

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Processing map for hot working of as extruded AZ31B magnesium alloy
HUANG Guang-sheng(黄光胜), HUANG Guang-jie(黄光杰), 
WANG Ling-yun(汪凌云), PAN Fu-sheng(潘复生)

College of Materials Science and Engineering, Chongqing University, 
Chongqing 400044, China

Abstract:The deformation behavior of AZ31B magnesium alloy as extruded under hot compression conditions was characterized in the temperature range of 200-400℃ and strain rate range of 0.001-1s-1. The processing maps were obtained at different strains. The results show that the map exhibits flow instabilities as two domains. The domain at beyond 300℃ and strain rate of 1s-1 appears with a peak efficiency of power dissipation about 56% occurring. This domain is expected to happen in a hot process, such as hot rolling, hot extrusion and hot forging. There is high efficiency of power dissipation at temperature beyond 350℃ and strain rate 0.001s-1. Such domains suggest the occurrence of superplastic deformation. 

 

Key words: magnesium alloy; AZ31B; processing map; hot deformation; flow instability 

ISSN 1672-7029
CN 43-1423/U

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