Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 29    No. 8    August 2019

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Microstructure evolution and mechanical properties of Al-6.5Cu-0.6Mn-0.5Fe alloys with different Si additions
Rui XU1, Bo LIN 1, Hao-yu LI 1, Hua-qiang XIAO1, Yu-liang ZHAO2, Wei-wen ZHANG3

1. School of Mechanical Engineering, Guizhou University, Guiyang 550025, China;
2. School of Mechanical Engineering, Dongguan University of Technology, Dongguan 523808, China;
3. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China

Abstract:The effect of Si content on the microstructures and mechanical properties of the heat-treated Al-6.5Cu-0.6Mn-0.5Fe alloy was investigated using image analysis, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and tensile testing. The results show that the mechanical properties of Al-6.5Cu-0.6Mn-0.5Fe alloys decrease slightly when the Si content is below 1.0%. This can be attributed to the comprehensive effect of microstructure evolution, including the increase of nano-sized α-Fe, the coarsened grain size, and an increase in Al2Cu content at the grain boundary. When the Si content is 1.5%, the mechanical properties of the Al-6.5Cu-0.6Mn-0.5Fe alloys decrease significantly, and this can be attributed to the agglomerated second intermetallics, which is resulted from the formation of excess Si particles.


Key words: Al-Cu alloys; iron-rich intermetallics; Si; tensile properties

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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