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Effects of manganese on microstructure and mechanical properties of A206 alloys containing iron

Published online by Cambridge University Press:  31 January 2011

Chien-Jung Tseng ,
Sheng-Long Lee ,
Sheng-Chuan Tsai  and
Chia-Jen Cheng
Chien-Jung Tseng
Affiliation:
Department of Mechanical Engineering, National Central University, Chung-Li 320, Taiwan, Republic of China
Sheng-Long Lee
Affiliation:
Department of Mechanical Engineering, National Central University, Chung-Li 320, Taiwan, Republic of China
Sheng-Chuan Tsai
Affiliation:
Department of Mechanical Engineering, National Central University, Chung-Li 320, Taiwan, Republic of China
Chia-Jen Cheng
Affiliation:
Department of Mechanical Engineering, National Central University, Chung-Li 320, Taiwan, Republic of China
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Abstract

The effects of Mn and Fe contents on the mechanical properties of aluminum-based A206 alloys were investigated quantitatively. Results showed that the addition of Fe caused a loss in both ductility and yield strength. Further addition of Mn could recover the ductility, but it caused a further loss in yield strength. In low-Mn alloys (0.29 wt% Mn) the primary constituent was the needle shape of Cu2FeAl7. Upon further addition of Mn, the Chinese script configuration of Mn-bearing particles formed instead. The Cu2Mn3Al20 particles formed in high-Mn alloys during solution treatment and resulted in grain-growth inhibition. The needle, Mn-bearing, and Cu2Mn3Al20 particles caused the solid solution level of copper in the matrix to decrease; meanwhile, increasing the Mn solution level retarded the precipitation of the strengthening phase. Differential scanning calorimetry analyses showed the kinetics and amount of decrease in θ′ phase precipitation when the contents of Fe and/or Mn were increased. The smaller grain size induced by the Cu2Mn3Al20 particles and the θ′ phase were the factors that determined the hardness of A206 alloys under as-quenched and T7-treated conditions, respectively.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 9 , September 2002 , pp. 2243 - 2250
Copyright
Copyright © Materials Research Society 2002

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