( 東北大學(xué) 材料與冶金學(xué)院, 沈陽 110004)
摘 要: 熔制了Al-Zn-Cu系的13個不同成分的合金， 并進(jìn)行了組織均勻化和平衡冷卻至200℃的緩冷處理。 通過顯微組織觀察、 X射線衍射分析和電子探針微區(qū)成分分析， 測定了這13個合金的相組成及成分。 結(jié)果表明， 在200℃時， 富鋁角/α/相的Zn、 Cu、 Al含量（摩爾分?jǐn)?shù)）分別為6.7%、 2.0%和91.3%， 確定了/T/′相的成分范圍以及Al2Cu3相中Zn的溶解度（摩爾分?jǐn)?shù)）小于4.4%， 繪制出了Al-Zn-Cu系200℃低Cu側(cè)的等溫截面相圖。
關(guān)鍵字: 相圖； Al-Zn-Cu三元系； T′相； α相
HAO Shi-ming, LI Hong-xiao
（ School of Materials and Metallurgy,
Northeastern University, Shenyang 110004, China）
Abstract: The phase composition and constituent of 13 designed alloys in Al-Zn-Cu system were analyzed by optical microscope, X-ray diffraction and EPMA method. These samples were prepared through sufficient homogenization and equilibrium cooling heat treatment from 400℃ to 200℃. The results show that the contents(in mole fraction) of Zn, Cu and Al of α phase ( rich aluminum phase) at 200℃ are 6.7%， 2.0% and 91.3% respectively. The composition range of T′ phase was determined and the solubility(in mole fraction) of Zn in Al2Cu3 is less than 4.4%. The isothermal section diagram of Al-Zn-Cu system on lower copper side at 200℃ was constructed.
Key words: phase diagram; Al-Zn-Cu system; T′ phase; α phase
