Effect of Cold Work on the Precipitation Process in Aluminum Alloy 6063

Volume 9 , Issue 1 , September 2007 , Pages 31-41

Authors

Sheirko Shakir Fettah 1 ; Omer Salih Mahmood 1 ; Shawnim R. Jalal RojbeYani 2

1 College of engineering. University of Sulaimani, Kurdistan Region/Iraq

2 college of engineering. uniiersity of salahadine, Kurdistan Regiorvlraq

DOI logo 10.17656/jzs.10146

Keywords

Abstract

Aluminum alloys can be strengthetred by cold or hot working due to interaction between precipitates
and dislocations. The alloy 6063-was deformed (2, 5, 10, f S,an{-ZO) oh aftet water quenching' and
artificially aged at different aging temperatures (16b, 180 and 200) oC for various periods of time (0'5' 5'
10, 50 and 100) hours. The risults showed a considerable improvement in yield and tensile strength with
an increasing level of prestrain. Generally aging temperature of 160 oC gave the best- in^crease of yield and
tensile strength, but these were decreasia *itt incieasing aging temperature i'e' (180 and 200) "C at a
given level of presh'ain. -r --.:.L ^- :-^-^- " Th" peak aging time that improves the mechanical properties decreased with an increasing aging
temperature. The alloy of 20 Yadeformation anJageO at tOO iC for l0 hours developed maximum (yield'
tensile strength and hardness) values .o*pur"d rriih all other conditions involved, because the density of
dislocation tangles which improved (yield and tensile) strength increased with increasing degree of
prestrain.
The 6xxx aluminum alloYs are
local softening in the heat-affected
parent metal.

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