32(AlZn)49相以及針狀的S-Al2MgCu相。然而合金經T4P處理后,再峰時效處理的組織只含有細小而高密度的T-Mg32(AlZn)49相而不包括S-Al2MgCu相。自然時效后不穩(wěn)定的原子團簇在180℃時效后會回溶到基體中, 從而抑制了合金的時效析出強化。而預時效后生成的穩(wěn)定的原子團簇會成為180℃時效的形核點,顯著提高了合金的時效響應速度。"/>

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預時效對Al-5.2Mg-0.45Cu-2.0Zn合金室溫穩(wěn)定性的影響
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北京科技大學新金屬材料國家重點實驗室

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Effect of pre-aging treatment on the stability of Al-5.2Mg-0.45Cu-2.0Zn alloy sheet at room temperature
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State Key Laboratory of Advanced Metals and Materials,University of Science and Technology Beijing

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    摘要:

    本文詳細研究了預時效對Al-5.2Mg-0.45Cu-2.0Zn合金時效析出行為的影響。預時效不僅提高了合金的室溫穩(wěn)定性,避免了合金烤漆軟化,同時提高了合金的烤漆時效響應速度。合金經T4處理后,再峰時效處理后的組織包括粗大的T-Mg32(AlZn)49相以及針狀的S-Al2MgCu相。然而合金經T4P處理后,再峰時效處理的組織只含有細小而高密度的T-Mg32(AlZn)49相而不包括S-Al2MgCu相。自然時效后不穩(wěn)定的原子團簇在180℃時效后會回溶到基體中, 從而抑制了合金的時效析出強化。而預時效后生成的穩(wěn)定的原子團簇會成為180℃時效的形核點,顯著提高了合金的時效響應速度。

    Abstract:

    In this research, pre-aging treatment has been performed on our newly developed Al-5.2Mg-0.45Cu-2.0Zn alloy. Results show that pre-aging treatment not only improves the stability of the alloy sheet at room temperature, which avoids the paint-baking softening, but also enhances the age hardening response during subsequent artificial aging at 180℃. The microstructure of the T4 sample in peak aged condition consists of coarse lath-like T-Mg32(AlZn)49 phase and needle-like S-Al2MgCu phase. However, the microstructure of the T4P sample in peak aged condition only consists of high density of finer and equiaxed T phase with the S phase disappeared. Unstable clusters formed during natural aging dissolve when imposed on 180℃, which retards the precipitation process of the alloy. Stable clusters formed during pre-aging treatment serves as the nucleis of the T phase during aging at 180℃, which enhances the age hardening response of the alloy.

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曹城,張迪,莊林忠,張濟山.預時效對Al-5.2Mg-0.45Cu-2.0Zn合金室溫穩(wěn)定性的影響[J].稀有金屬材料與工程,2020,49(4):1166~1170.[Cheng Cao, Di Zhang, Linzhong Zhuang, Jishan Zhang. Effect of pre-aging treatment on the stability of Al-5.2Mg-0.45Cu-2.0Zn alloy sheet at room temperature[J]. Rare Metal Materials and Engineering,2020,49(4):1166~1170.]
DOI：10.12442/j. issn.1002-185X.20180369

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  • 收稿日期:2018-04-12
  • 最后修改日期:2020-03-25
  • 錄用日期:2019-12-04
  • 在線發(fā)布日期: 2020-05-07
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