THE EFFECT OF AGEING TEMPERATURE ON MICROSTRUCTURAL AND MECHANICAL PROPERTIES OF AL-MG-SI ALLOY

Fatima Z. Lemmadi, Abdelouahed Chala, Okba Belahssen, Said Benramache

Abstract


The aging effect before and after quenching at a temperature of 400 °C of Al 6000 alloy was studied. The ageing temperature used in this work was 300 °C pending time 24 and 48 h. The structural properties were investigated using X-ray diffraction; the microstructural evolution was investigated using optical, scanning and transmission electron microscopies and microhardness measurement for the mechanical properties. After various states of ageing, the Al-Mg-Si alloy shows significant changes in the microstructure and mechanical behaviour. After ageing, the microstructure of the matrix consisted of a two solid solution of α–Al and β– Mg2Si phases precipitation. After two-step ageing at 300 °C, corresponding to the minimum value of microhardness, the alloy reveals small β continuous precipitates. After ageing at 300 °C of original sample, the volume fraction of this precipitates becomes higher. On the other hand, the optimal ageing time was 48 h in all steps.


Keywords


Al 6000 alloy; aging; phases precipitates; mechanical behaviour.

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References


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DOI: http://dx.doi.org/10.12776/ams.v20i4.354

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SJR 2014: 0.502 - Q2 Metals and Alloys, 39./125.

SJR 2013: 0.309 - Q2 Metals and Alloys, 59./121.       

SJR 2012: 0.325 - Q2 Metals and Alloys, 33./90. (A)

SJR 2011: 0.363 - Q2 Metals and Alloys, 29./90. (A)

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EV 5174/15

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