Effect of Additional Elements (Cu, Ag) on Precipitation in 6xxx (Al-Mg-Si) Alloys

Kenji Matsuda; Junya Nakamura; Tokimasa Kawabata; Susumu Ikeno; Tatsuo Sato; Calin D. Marioara; Sigmund J. Andersen; Randi Holmestad

doi:10.4028/www.scientific.net/MSF.706-709.357

Paper Titles

Microstructure and Properties of an Al-7.5Zn-1.5Mg-1.4Cu-0.12Zr Alloy Forging
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Research on Multi-Artificial Aging Applied to Aluminum Alloy 7150 Plate
p.340

Investigation on Quench Sensitivity of a Heat-Resistant Aluminum Alloy
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Combined Effect of Deformation and Precipitation on Tensile Properties of an Al-Mg-Si Alloy
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Effect of Additional Elements (Cu, Ag) on Precipitation in 6xxx (Al-Mg-Si) Alloys
p.357

Effect of the Thermomechanical Processing on Microstructure and Properties of an Al-Ce Alloy
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Producing Aluminum Foam Sandwich Panel by Melt Drag Process
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Combined Method of Electric Contact Heating and Diffusion Connection of Steel-Aluminum
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Effects of Pre-Aging on Bendability of an Asymmetric-Rolled Al-Mg-Si Alloy
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HomeMaterials Science ForumMaterials Science Forum Vols. 706-709Effect of Additional Elements (Cu, Ag) on...

Effect of Additional Elements (Cu, Ag) on Precipitation in 6xxx (Al-Mg-Si) Alloys

Abstract:

It has been known that Cu- or Ag-addition Al-1.0mass%Mg₂Si (balanced) alloys shows higher hardness and elongation than Cu-free or Ag-free balance alloy. In this study, the alloys with Cu or Ag addition and the alloys with Si / Mg in excess have been investigated by hardness and tensile tests and HRTEM observation. Cu addition is effective for higher hardness, and Ag-addition is useful for improvement of elongation for peak-aged samples. Precipitates in peak aged these alloys have been confirmed by HRTEM. Cu-addition alloy almost includes Q’-phase, and Ag-addition alloy includes b’-phase. The precipitation sequence of Ag- or Cu addition Al-Mg-Si alloy was investigated using HRTEM, SAED, and EDS. The precipitates obtained in the two alloys were classified into several kinds by HRTEM images and SAED patterns. The relative frequencies of precipitates were also investigated and compared with that in the alloy.