Hot Workability Analysis and Development of a Processing Map for Homogenized 6069 Al Alloy Cast Ingot

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• 作者：Feng-jun Zhu ; Horng-yu Wu ; Ming-chieh Lin…
• 关键词：6069 Al alloy ; dynamic recovery ; dynamic recrystallization ; efficiency of power dissipation ; instability ; processing map
• 刊名：Journal of Materials Engineering and Performance
• 出版年：2015
• 出版时间：May 2015
• 年：2015
• 卷：24
• 期：5
• 页码：2051-2059
• 全文大小：1,644 KB
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• 作者单位：Feng-jun Zhu (1)
  Horng-yu Wu (2)
  Ming-chieh Lin (2)
  Shyong Lee (1)
  Woei-ren Wang (3)
  
  1. Department of Mechanical Engineering, National Central University, Jhongli, 320, Taiwan
  2. Department of Mechanical Engineering, Chung Hua University, Hsinchu, 300, Taiwan
  3. Nanopowder and Thin Film Technology Center, ITRI South, Industrial Technology Research Institute, Tainan, 709, Taiwan
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Characterization and Evaluation Materials
  Materials Science
  Tribology, Corrosion and Coatings
  Quality Control, Reliability, Safety and Risk
  Engineering Design
  
• 出版者：Springer New York
• ISSN：1544-1024

文摘

The hot workability of homogenized 6069 Al alloy cast ingot was examined via hot compression tests. These tests were conducted using Gleeble-3500 thermal simulation machine within a temperature range of 300-550?°C and a strain rate range of 0.001-10?s?. The compression data were then used to construct a processing map, through which a safe processing region was identified. The safe processing region could be divided into dynamic recovery and dynamic recrystallization domains. The variation in microstructure was related to the variation in efficiency of power dissipation, as indicated by microstructure observations. Dynamic recovery was observed in regions associated with the intermediate efficiency of power dissipation, whereas partial dynamic recrystallization occurred in regions with high efficiency. Flow instability was found to be related to flow localization. The strain rate sensitivity m map showed that flow localization occurred because of the deformation conditions with low m values. The kinetic analysis revealed a decrease in apparent activation energy with increased temperature in the partial dynamic recrystallization region.