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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Identification and analysis of intermetallic phases in overaged Zr-containing and Cr-containing Al-Zn-Mg-Cu alloys
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Identification and analysis of intermetallic phases in overaged Zr-containing and Cr-containing Al-Zn-Mg-Cu alloys

机译：过时效含Zr和含Cr的Al-Zn-Mg-Cu合金中金属间相的鉴定和分析

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摘要

This paper investigates the effect of alloying elements on the characteristics of intermetallic phases inZr-containing and Cr-containing 7xxx Al-Zn-Mg-Cu alloys at overaged conditions. Four Al-Zn-Mg-Cu alloy plates with different alloying element contents were studied by optical microscopy based image analysis, differential scanning calorimetry, scanning electron microscopy combined with energy disperse X-ray spectroscopy and transmission electron microscopy. The grain structures, recrystallisation, intermetallic phases and precipitates in the selected alloys have been analyzed and the presence of coarse intermetallic phases has been interpreted using established phase diagrams. The different effects of Zr or Cr addition to the alloys have been compared. The experimental results showed that the recrystallised area fraction of Zr-containing alloys is less than that of Cr-containing alloys, being attributable to Zr reducing recrystallisation more effectively than Cr. The detected particles are mainly S phase, Al_7Cu_2Fe, as well as dispersoids of Al_3Zr for Zr-containing alloys and Cr-rich E phase for Cr-containing alloys. These coarse particles, especially the S phase which cannot be dissolved during solution treatment, are detrimental to the fracture toughness of the alloys.
机译：本文研究了合金元素对过时效条件下含Zr和含Cr的7xxx Al-Zn-Mg-Cu合金中金属间相特征的影响。通过基于光学显微镜的图像分析，差示扫描量热法，扫描电子显微镜结合能量色散X射线光谱和透射电子显微镜研究了四种不同合金元素含量的Al-Zn-Mg-Cu合金板。分析了所选合金中的晶粒结构，再结晶，金属间相和析出物，并使用已建立的相图解释了粗大的金属间相的存在。比较了Zr或Cr添加到合金中的不同效果。实验结果表明，含Zr合金的再结晶面积分数小于含Cr合金，这归因于Zr比Cr更有效地减少了再结晶。所检测到的颗粒主要是S相，Al_7Cu_2Fe，以及含Zr合金的Al_3Zr弥散体和含Cr合金的富Cr E相。这些粗大的颗粒，特别是在固溶处理期间不能溶解的S相，不利于合金的断裂韧性。

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