Abstract
The phase diagram of the system Al-Zn-Mg-Cu (especially in the range of Al-side) has been studied by means of microscopic examination, inverse-rate thermal analysis, electric resistance measurement and X-ray analysis. The Al side of this system is divided into three ranges by the pseudo-ternary systems of Al-ω-CuAl2 and Al-ω-S, and in these ranges no quarternary intermetallic compound appears. The reactions—ternary eutectic, quarternary eutectic and peritecto-ternary eutectic—in the range of Al-ω-CuAl2-S and Al-ω-S-T-β were observed as follows:
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The Al-side solubility curves of the Al-ω and Al-ε alloys were lowered by addition of Cu 2% as shown in Fig. 9 and 11.
