高纯Al-Cu-Mg-Ag合金的时效析出行为.pdf

文档介绍：第17 卷第3 期 中国有色金属学报 2007 年3 月
of the
ageing alloy underwent at 185 ℃ for 50 h is only decreased by 6% to 7% of the peak-aged alloy, and the elongation ratio
of δ10 retains up to 8%. Under condition of peak-aged, high misfit strain exists near Ω/α interface and leads to dislocation
at the fine laths of Ω phase, which actually serve as favorable heterogeneous nucleation sites for secondary-precipitated
phase θ′. As ageing time prolongs, larger Ω phase and mostly metastable θ′ phase including primary and secondary
precipitate transmit to equilibrium θ phase, but the transmission procedure of Ω→θ is much slower than that of θ′→θ.
Key words: Al-Cu-Mg-Ag alloy; Ω phase; primary-precipitated phase; secondary-precipitated phase; coarsening


在目前航空工业上应用的工程合金中，铝合金由 研究热点。近年来，国内外研究者曾先后在 2014、
于其比强度高、成本低、易加工等一系列优点获得广 2219、2519 等传统 2×××系合金的基础上研制新一代
泛应用，但是在 100 ℃以上的温度条件下，铝合金的 超音速飞机用铝合金材料，通过向合金中添加 Ag、
力学性能迅速下降，使其在飞机上的应用受到较大限 RE(稀土元素)等元素，改变合金的时效析出行为，以
制。向 Al-Cu 二元合金中添加适量