Effect of SiC volume fraction on the age-hardening behavior in SiC particulate-reinforced 6061 aluminum alloy composites |
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Authors: | H K Ahn C H Yu |
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Affiliation: | (1) Division of Advanced Materials Engineering The Research Institute of Industrial Technology, Chonbuk National University, 664-14 Duckjin-dong, Duckjin-ku, 561-756 Chonju, Korea |
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Abstract: | The age-hardening behavior in the SiC particulate-reinforced 6061 aluminum alloy composites (SiCp/6061 Al alloy composites)
was investigated using hardness measurement, calorimetric technique and transmission electron microscopy. The aging time for
the peak hardness in 10%SiCp/6061 Al and 20%SiCp/6061 Al alloy composites was shorter than that of the unreinforced 6061 Al
alloy, and the age-hardening was most accelerated in the 20%SiCp/6061 Al alloy composite. It is induced from the high density
of dislocations in SiCp/6061 Al alloy composites which act as heterogeneous nucleation sites of precipitates and as a high
diffusivity path of alloy elements. The precipitation sequence and the aspect of precipitates in the 6061 Al alloy cannot
be affected considerably by the presence of SiC particulate and the volume fraction of SiC particulate. The activation energies
for the formation of the intermediate β' phase in the unreinforced 6061 Al alloy, 10%SiCp/6061 Al and 20%SiCp/6061 Al alloy
composite were 142.6 kJ/mol, 127.3 kJ/mol, 106.1 kJ/mol, respectively. |
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Keywords: | 6061 Al alloy SiCp/6061 Al alloy composite SiCp volume fraction age-hardening behavior activation energy |
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