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The Effect of Microalloying of Nickel, RRA Treatment on Microstructure and Mechanical Properties for High Strength Aluminum Alloy

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Abstract:

High strength aluminum alloys Al-Zn-Mg-Cu-(0.1) Ni produced by semi-direct chill casting process were homogenized at different conditions then conducted heat treatment process which comprised pre-aging at 120°C for 24 h, retrogression at 180°C for 30 min, and then re-aging at 120°C for 24 h. Microstructural studies showed that add Ni (0.1 wt %) to the alloy will be forming Ni-rich phases such as AlCuNi, AlNi, AlNiFe and AlMgNi which provide a dispersive strengthening affected in the solid-solution and the subsequent heat treatments. The results showed that by this three-step process of heat treatments, the mechanical properties of aluminum alloys Al-Zn-Mg-Cu-(0.1) Ni were substantially improved. The highest attain for the ultimate tensile strength and Vickers hardness for the alloy sample after applied the retrogression and reaging process is about 545 MPa and 237 HV respectively.

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Periodical:

Advanced Materials Research (Volume 925)

Pages:

253-257

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.925.253

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Online since:

April 2014

Authors:

Haider T. Naeem*, Kahtan S. Mohammad, Khairel R. Ahmad

Keywords:

Aluminum Alloys 7xxx, Mechanical Property, Microalloying Nickel, RRA, SEM

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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