Study on properties and precipitation behavior of 6000 series alloys with high Mg/Si ratios and Cu contents
Study on properties and precipitation behavior of 6000 series alloys with high Mg/Si ratios and Cu contents
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高Mg/Si比和Cu含量的6000系合金性能及析出行为研究
DOI：
10.1016/j.matchar.2022.112402
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发表时间：
2022-10
影响因子：
4.7
通讯作者：
Yanjun Li
中科院分区：
文献类型：
--
作者：
Ruojin Zang;Yaru Ning;Lipeng Ding;Zhihong Jia;Kaiyun Xiang;Qing Liu;Lingfei Cao;Yanjun Li
高Cu和过量Mg的组合在抑制Al-Mg-Si-Cu合金的自然时效（NA）和增强人工时效（AA）期间的沉淀强化响应方面先前显示出优异的效果。采用维氏硬度、拉伸、差示扫描量热（DSC）和透射电镜（TEM）等方法研究了一系列高Mg/Si比（1.5 ~ 3.0）和高Cu含量（0.7和1.0wt%）的6000合金在不同时效条件下的析出行为。在加速退火过程中，Cu含量的增加和Mg/Si比的降低都能促进细小亚稳相的析出，且Cu含量的增加作用更为显著。Mg/Si比为1.5被认为是在这项研究中，产生最大的沉淀硬化响应的最佳组合物。此外，高Mg/Si比能促进QP 2相的无序析出，这与传统的β”相强化的应用合金有明显的不同。因此，探讨了化学成分对富镁高铜合金复杂析出行为及性能的影响，为开发新型Al-Mg-Si基合金提供了理论依据。
A combination of high Cu and excess Mg contents has previously shown excellent effects on suppressing the natural aging (NA) and enhancing the precipitation strengthening response during artificial aging (AA) of Al-Mg-Si-Cu alloys. In this work, the precipitation behaviors of a series of 6000 alloys with high Mg/Si ratios from 1.5 to 3.0 and high Cu content levels (0.7 and 1.0 wt%) under different aging conditions were studied by Vickers hardness measurements, tensile tests, differential scanning calorimetry (DSC) analysis and transmission electron microscopy (TEM) characterization. During AA, an increased content of Cu and a reduced Mg/Si ratio can promote the precipitation of fine metastable phases, and the effect of the former is more significant. A Mg/Si ratio of 1.5 is found to be the optimum composition in this study, which produces the maximum precipitation hardening response. Besides, high Mg/Si ratio can enhance the precipitation of disordered QP2 phases, which is obviously different from the conventional applied alloys strengthened by the β” phase. Thus, the effects of chemistry on the complex precipitation behavior and the properties of Mg-rich high Cu alloys have been discussed, which will be beneficial to develop new Al-Mg-Si based alloys.