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20 8 2010 8
Vol.20 No.8 The Chinese Journal of Nonferrous Metals Aug. 2010
1004-0609(2010)08-1527-06
Ag 6022
( 410083)
DSC TEM Ag 6022
6022 0.35%()Ag
6022 175 30 min T4
Ag GP β″
β″
6022 Ag
TG146.21 A
Effect of Ag on microstructure and properties of
6022 aluminum alloy for automotive body sheets
WANG Xiao-ning, LI Shi-cheng ,ZHENG Zi-qiao, ZHU Xiao-hui, YAN Yan
(Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education,
Central South University, Changsha 410083,China)
Abstract: The effect of Ag on the formability, paint-bake tensile properties, aging dynamics and microstructures of 6022
aluminum alloy for automotive body sheets were studied by hardness tests, tensile tests, differential scanning
calorimetry(DSC) and transmission electron microscopy(TEM). The results show that the formability of 6022 alloy
containing 0.35% (mass fraction) Ag in T4 condition is declined a little, and after 30 min paint-bake aging at 175 ,
higher strength can be obtained. Ag addition can also improve the aging response and hardness, and promote the
precipitation of the β″ phase which should prefer to nucleate on the position of GP zones.
Key words: 6022 aluminum alloy; automotive body sheets; Ag; formability; paint-bake aging
Cu Cu
β″
30% Cu Al
47%100 kg Cu
0.4~1.0 L/km[1]6×××(Al-Mg-Si) Ag Al
[3]
[4]Al-Mg-Si Ag
T4
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