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工业高强Al-Zn-Mg-Cu1.5合金总是含百分之零点几(重量比)的杂质Fe和Si,还常含千分之零点几的Ti.为了提高抗应力腐蚀开裂的性能及控制析出状态,常常往这类合金中添加些Cr和Mn.最近出现用Zr代替Cr和Mn的趋势.图1和图2示出最终状态的Al-Zn-Mg-Cu1.5板材的组织.它们的金属间化合物在均匀化和固溶处理时都不溶解.采用带ZAF校正的EDX分析仪对这些相进行了研究.粒子沿轧制方向呈直线状排列,由短的互不相连的条状组成,条状组织的成分完全是Mg_2Si或含Fe的相(图1和2).图1示出粗大的、在变
Industrial high-strength Al-Zn-Mg-Cu1.5 alloy always contains a percentage of a few percent by weight of Fe and Si impurities, but also often contain a few tenths of a few Ti.In order to improve the resistance to stress corrosion cracking Performance and control of the precipitation state, often adding some such alloys Cr and Mn.Recently with the trend of Zr instead of Cr and Mn.Figure 1 and Figure 2 shows the final state of the Al-Zn-Mg-Cu1.5 sheet All these intermetallics did not dissolve during homogenization and solution treatment.These phases were investigated using an EDX analyzer with ZAF correction.The particles were aligned linearly along the rolling direction and were composed of short, , The composition of the stripe structure is entirely Mg2Si or Fe-containing phases (Figures 1 and 2) .Figure 1 shows the coarse,