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Ag，Mg合金化對Al-Cu-Li合金時效特性和顯微組織的影響
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“十五”民口配套項目（MKPT-2004-19ZD）


Effects of Ag, Mg Micro-Alloying on Aging Characteristics and Microstructure of Al-Cu-Li Alloy
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    摘要:

    通過力學(xué)性能測試和顯微組織觀察研究微量Ag和Mg對Al-3.5Cu-1.0Li合金時效特性和顯微組織的影響。結(jié)果表明：在175 ℃時效時，單獨加Ag不影響合金的時效硬化效果，析出物形貌與Al-Cu-Li合金相似，峰值時效狀態(tài)下均析出較粗大的T1相和θ′相；單獨加Mg加快Al-Cu-Li合金的時效響應(yīng)，提高合金的時效硬化效果，時效時析出GP區(qū)，θ′相和T1相；Ag和Mg同時添加的2050合金中，T1相的析出速度加快，析出密度增大，并以T1相為主要強化相，時效強化效果最大。Ag，Mg添加對合金的不同影響可通過溶質(zhì)原子與空位、溶質(zhì)原子與溶質(zhì)原子之間的相互作用來解釋。

    Abstract:

    The effect of small addition of Ag, Mg on the microstructure and the aging characteristics of Al-3.5Cu-1.0Li alloy has been studied by mechanical testing and transmission electron microscopy. The results indicate that only sliver addition has almost no effect on the age-hardening and strengthening of the baseline alloy upon aging at 175 ℃. At peak aging state the main precipitates are both coarse T1 and θ′ phases for the Ag-bearing alloy and the baseline alloy. The Mg-containing alloy has a faster aging response and higher aging-strengthening effect than the baseline alloy. GP zone, θ′ and T1 are formed at different aging stages. The combined addition of Ag and Mg to the alloy greatly accelerates T1 precipitation, resulting in increasing density of T1 precipitates. The high volume fraction of T1 phase causes 2050 alloy having the highest strength. The independent and combined roles of small addition of Ag and Mg can be interpreted in terms of the solute-vacancy interaction and solute-solute atom interaction.

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王瑞琴,鄭子樵,陳圓圓,李世晨,魏修宇. Ag，Mg合金化對Al-Cu-Li合金時效特性和顯微組織的影響[J].稀有金屬材料與工程,2009,38(4):622~626.[Wang Ruiqin, Zheng Ziqiao, Chen Yuanyuan, Li Shichen, Wei Xiuyu. Effects of Ag, Mg Micro-Alloying on Aging Characteristics and Microstructure of Al-Cu-Li Alloy[J]. Rare Metal Materials and Engineering,2009,38(4):622~626.]
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  • 收稿日期:2008-04-03
  • 最后修改日期:2009-02-04
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