曹城,张迪,庄林忠,张济山.预时效对Al-5.2Mg-0.45Cu-2.0Zn合金室温稳定性的影响[J].稀有金属材料与工程,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.]
预时效对Al-5.2Mg-0.45Cu-2.0Zn合金室温稳定性的影响
投稿时间:2018-04-12  修订日期:2020-03-25
中文关键词:  铝合金  相变  透射电镜
基金项目:
中文摘要:
      本文详细研究了预时效对Al-5.2Mg-0.45Cu-2.0Zn合金时效析出行为的影响。预时效不仅提高了合金的室温稳定性,避免了合金烤漆软化,同时提高了合金的烤漆时效响应速度。合金经T4处理后,再峰时效处理后的组织包括粗大的T-Mg32(AlZn)49相以及针状的S-Al2MgCu相。然而合金经T4P处理后,再峰时效处理的组织只含有细小而高密度的T-Mg32(AlZn)49相而不包括S-Al2MgCu相。自然时效后不稳定的原子团簇在180℃时效后会回溶到基体中, 从而抑制了合金的时效析出强化。而预时效后生成的稳定的原子团簇会成为180℃时效的形核点,显著提高了合金的时效响应速度。
Effect of pre-aging treatment on the stability of Al-5.2Mg-0.45Cu-2.0Zn alloy sheet at room temperature
英文关键词:Aluminum  alloys, Phase  transformation, Transmission  electron microscopy
英文摘要:
      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.
作者单位E-mail
曹城 北京科技大学新金属材料国家重点实验室 rocky_cao@sina.cn 
张迪 北京科技大学新金属材料国家重点实验室 zhangdi@skl.ustb.edu.cn 
庄林忠 北京科技大学新金属材料国家重点实验室  
张济山 北京科技大学新金属材料国家重点实验室  
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