Influence of heat treatment on microstructure and mechanical behaviour of hot-rolled Al-Mg-Si alloy

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ABSTRACT

As cast Al-Mg-Si alloy was hot-rolled at a temperature of 400^°C. After rolling, the alloy was subjected to T6 heat treatment by solutionising at 530^°C for 2 hours followed by quenching in water media. Heat-treated rolled Al-Mg-Si alloy was subjected to microstructural studies, microhardness test and tensile properties (In rolling direction, 45^° and 90^° to rolling direction). It is observed that heat treatment of rolled Al-Mg-Si alloy increases microhardness up to a certain duration of ageing and further drops to lower hardness. On heat treatment, the rolled alloy exhibited maximum tensile strength in rolling direction in comparison with 45^°and 90^°directions to rolling. It is observed that hot rolling followed by T6 heat treatment of Al-Mg-Si alloy tends to impart higher tensile strength compared to previously reported experimental values or commercially available alloys for developing high strength lightweight material. Under peak-aged condition, yield strength of 410 MPa and UTS of 440 MPa was achieved in the present work which is significantly higher than values reported in previous works.

KEYWORDS:

• Al-Mg-Si alloy
• mechanical properties
• hot Rolling
• heat Treatment

Disclosure statement

No potential conflict of interest was reported by the authors.