Clustering behaviour in an Al–Mg–Si–Cu alloy during natural ageing and subsequent under-ageing
作者： Lingfei Cao , Paul A. Rometsch , Malcolm J. Couper
DOI: 10.1016/J.MSEA.2012.08.093
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摘要: Abstract The clustering behaviour in an Al–Mg–Si–Cu alloy the T4 and T61 tempers has been investigated by hardness electrical conductivity testing, along with nanostructural characterisation using 3-D atom probe (3DAP) analysis. selection of parameters for PoSAP IVAS cluster analysis software tools is discussed. results show that increases significantly within one day natural ageing, then reaches a plateau after about week. A contingency table reveals between Mg Si atoms already exists condition only 1.1 h ageing. In (after 0.5 h at 170 °C), greatest samples aged immediately quenching, decreases very rapidly increasing prior ageing times up to 3 h. initial drop associated volume fraction, average size maximum solute aggregates. Longer inhibit formation larger aggregates (with more than 75 detected Mg+Si+Cu atoms) thus result low levels hardness.
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