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Effect of Trace Addition of Sn in Al-Cu Alloy
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Low Temperature Thermal Stability of Quaternary Al-Li-Cu-Mg Alloys
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Improvement of Bake-Hardening Response of Al-Mg-Cu Alloys by Means of Nanocluster Assist Processing (NCAP) Technique
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HRTEM Study of Precipitates in Al-Mg-Si and Al-Mg-Ge Alloys
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The Effect of Composition and Temperature on the Ageing Response of some Dilute 6xxx Series Alloys
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Precipitation Behaviour of Mg and Si at RT in Pre-Aged Al-Mg-Si Alloys
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Improvement of Bake-Hardening Response of Al-Mg-Cu Alloys by Means of Nanocluster Assist Processing (NCAP) Technique

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Abstract:

In this work, the bake-hardening (BH) response of an Al-3.0Mg-1.0Cu (in mass%) alloy has been improved by the small addition of Ag as a good example of our proposed Nanocluster Assist Processing (NCAP) technique. From the detailed observation through high resolution transmission electron microscopy (HRTEM), it is found that the origin of the increased hardness in the Ag-added alloy is attributed to the densely and uniformly formed Z phase at the expense of Guinier-Preston- Bagaryatsky (GPB) zones and the S’ phase. It is new findings that the Z phase is formed even in the ternary alloy although the chemical composition lies in the (α+S+T) phase field. Based on the threedimensional atom probe (3DAP) results, furthermore, it is suggested that nanoclusters of Mg, Ag and/or Cu provide effective nucleation sites for the Z phase, whereas nanoclusters of Mg and Cu do less. Such unique characteristics of Ag are clearly seen in the newly constructed interaction energy map (IE map).

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Periodical:

Materials Science Forum (Volumes 519-521)

Pages:

215-220

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.519-521.215

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Online since:

July 2006

Authors:

Shoichi Hirosawa, Tomoya Omura, Yoshikazu Suzuki, Tatsuo Sato

Keywords:

3DAP, Al-Mg-Cu, Bake-Hardening, High Resolution Transmission Electron Microscopy, Microalloyed, Nanocluster

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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