Effects of Cu Addition on Age Hardening Response of Al-7Si-4Mg Alloys at 130 °C

Inas M. Jauhari; Danny Taufik Bahar; Syarah Khayrun Nisa; Bondan Tiara Sofyan

doi:10.4028/www.scientific.net/KEM.833.74

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 833Effects of Cu Addition on Age Hardening Response...

Effects of Cu Addition on Age Hardening Response of Al-7Si-4Mg Alloys at 130 °C

Abstract:

The effects of Cu addition of 0.38, 3.82, and 6 wt. % in Al-7Si-4Mg alloy on hardness and age hardening response were discussed. Samples were solution treated at 495 °C for 2 h, quenched, and aged at 130 °C for 0 to 498 h. Characterization included hardness test, microstructural observation by an optical microscope (OM) and Scanning Electron Microscope (SEM) combined with Energy Dispersive X-Rays Spectroscopy (EDX), as well as Simultaneous Thermal Analysis (STA) testing. The results showed an increased in as-cast hardness along with addition of Cu. Peak hardness increased to 64.47, 65.8, and 70.1 HRB by addition of 0.38, 3.82, and 6 wt. % Cu, respectively. The addition of Cu promoted the formation of Al₂Cu and Al₅Cu₂Mg₈Si₆which contributed to higher as-cast hardness. Formation of GP-zone, θ”, and θ’ was observed after ageing at 48, 240, and 290 °C, respectively and no effects of Cu was detected on the formation temperatures of the precipitates.

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Key Engineering Materials (Volume 833)

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74-79

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https://doi.org/10.4028/www.scientific.net/KEM.833.74

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March 2020

Authors:

Inas M. Jauhari, Danny Taufik Bahar, Syarah Khayrun Nisa, Bondan Tiara Sofyan*

Keywords:

Ageing, Al-7Si-4Mg, Precipitation Strengthening

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