The structure changes proceeding during continuous heating of an A1-Zn(4.5 at. yo)-Mg(2.0 at.%) alloy were investigated by DSC and SAXS in dependence of the start radius, r s , of the metastable phases (G.P. zones and/or q'-phase) ranging from r s = 0.7 nm to 2.7 nm grown a t Tpre = R.T. or 100 "C. The stability of the metastable phases grown at T,,, is increasing with the rise of r s , whilst the Tpre applied does not remarkably affect their stability. Starting with rs > 1.6 nm the minima in the DSC-curve caused by the formation of $-phase on the expense of the dissolved part of the zones (1. minimum) or from overcritical G.P. zones (2. minimum) become more and more undistinct with the rise of rs. Die in einer AIZn(4.5 at.-yo)Mg(2.0 at.-yo)-Legierung beim kontinuierlichen Aufheizen vonstatten gehenden Strukturumwandlungen wurden mit Hilfe von DSC und RKWS in Abhiingigkeit vom Startradius, rs = (0.7 ... 2.7) nm, der metastabilen Phasen (GP-Zonen und/oder $-Phase), die bei T p r e = R.T. oder 100 "C gewachsen waren, untersucht. Die Stabilitiit der bei Tpre gebildeten metastabilen Phasen nimnit mit deren GroBe zu, wahrend eine Veriinderung von Tpre keinen nierklichen EinfluB zeigt. Startet man mit Partikeln von rs > 1.6 nm, so erscheinen die Minima, die durch die Bildung von q'-Phase aus den aufgelosten GP-Zonen (1. Minimum) bzw. aus uberkritischen Zonen entstanden sind (2. Minimum), mit Zunahme von rs immer undeutlicher.
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