Someone could explain to me: what is the difference between the precipitates β´ (Mg1.8Si) and β´´ (Mg5Si6), in the aging of Al-Mg-Si alloy?

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Chen Ding

β´´ (Mg5Si6) is s the strengthening phase，The latter is precipitated during over-aging。 Hope it will be helpful.

Murat Tiryakioḡlu

beta prime can also precipitate during quenching. It is non strengthening so the more beta prime precipitate, tje lower the strengthening potentisl of the alloy, i.e., aging response, during agong.