形变时效态Al-3.0Cu-1.8Mg-0.5Si合金的强化机制研究
Study on Strengthening Mechanism of the Al-3.0Cu-1.8Mg-0.5Si Alloy processed by Thermo-mechanical treatment
投稿时间:2021-05-18  修订日期:2021-08-05
DOI:
中文关键词:  铝合金  形变时效  EBSD  XRD  TEM
英文关键词:Aluminum alloy  Thermo–mechanical treatment  EBSD  XRD  TEM
基金项目:长安大学中央高校基本科研业务费专项资金资助(300102501102)
作者单位邮编
牛凤姣 长安大学 710061
伍翠兰 湖南大学 410082
武静 湖南大学材料科学与工程学院 
沈书成 湖南大学材料科学与工程学院 
罗世芳 湖南大学材料科学与工程学院 
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中文摘要:
      时效前形变的引入,可以改变析出强化型Al-Cu-Mg(-Si)合金的时效析出过程,并且这种变化与形变量直接相关。为研究多元合金的形变强化机制,有必要利用电子背散射衍射(EBSD)、X射线衍射(XRD)、透射电子显微镜(TEM)等多种表征手段,对不同形变时效态Al-3.0Cu-1.8Mg-0.5Si(wt.%)合金的强化方式进行定量或半定量计算,阐述不同强化方式对强度的贡献,为铝合金中形变时效工艺的应用提供理论支撑。研究发现,形变量的提高可以提高合金峰值硬度和强度,原因在于三个方面,一是晶界面积的增加,二是位错密度的增大,三是析出相尺寸更细小、分布更均匀。并且,当形变量大于6%时,形变量越大,析出相对强度的贡献越高。
英文摘要:
      The introduction of deformation before aging can change the aging precipitation process of the precipitation-strengthened Al-Cu-Mg(-Si) alloy, and this change is directly related to the amount of deformation. In order to study the deformation strengthening mechanism of multi-element alloys, it is necessary to use electron backscatter diffraction (EBSD), X-ray diffraction (XRD), transmission electron microscopy (TEM) and other methods to test the Al-3.0Cu-1.8 Mg-0.5Si (wt.%) alloy treated by different deformation and aging process, quantitatively or semi-quantitatively, so that the contribution of different strengthening methods to the strength is listed, which provides theoretical support for the application of thermo–mechanical treatment in aluminum alloys. It has been found that the increase in deformation can increase the peak hardness and strength of the alloy due to three reasons. One is the increase in the grain-boundary area, the second is the increase in the dislocation density, and the third is that the size of the precipitates is smaller and the distribution is more uniform. Furthermore, the contribution of precipitates to the strength is getting higher with a larger deformation prior to aging process, when the amount of deformation is greater than 6%.
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