Effect of Zn addition on the precipitation behaviors of Al-Mg-Si-Cu alloys for automotive applications
Effect of Zn addition on the precipitation behaviors of Al-Mg-Si-Cu alloys for automotive applications
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添加Zn对汽车用Al-Mg-Si-Cu合金析出行为的影响
DOI：
10.1007/s10853-016-0433-3
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发表时间：
2017-02-01
影响因子：
4.5
通讯作者：
Zhuang, L. Z.
中科院分区：
文献类型：
--
作者：
Guo, M. X.;Zhang, X. K.;Zhuang, L. Z.
通过差异扫描量热法（DSC），硬度测量，拉伸测试和微结构表征研究了Zn添加对Al-MG-SI-CU合金的降水动力学和年龄较大反应的影响。结果表明，与无锌合金相比，DSC曲线中的起始温度和峰值温度以及βaeuro的激活能（3）Zn添加的Al-Mg-Si-Cu合金的降水显着降低，相当于对降水动力学和年龄增强的降水动力学和年龄增强的降水动力学和年龄的增量，即在强度上增加了一定的降水量。此外，在添加3.0 wt％Zn之后，峰硬度和拉伸性能也可以大大增强，甚至在峰值状态下表现出延性裂缝特征。在185 a c时衰老后，Zn增添的Al-Mg-Si-Cu合金中，Al-Zn-MG合金系统的沉淀物没有出现，而前βaeuro（3），βaeuro（3），L降水仍然是两种Alloys的主要沉淀物。最后，根据微观结构演化，提出了Al-Mg-Si-Cu-Zn合金中降水的示意图，还建立了机械性能与微结构之间的关系。
Effect of Zn addition on the precipitation kinetics and age-hardening response of Al-Mg-Si-Cu alloys was investigated by differential scanning calorimetry (DSC), hardness measurements, tensile tests and microstructural characterization. The results show that, compared with the Zn-free alloy, both the starting and peak temperatures in the DSC curve, and activation energy of beta aEuro(3) precipitation of Zn-added Al-Mg-Si-Cu alloy decrease significantly, corresponding to the greatly improved precipitation kinetics and age-hardening response, i.e., a hardness increment of 70HV after aging at 185 A degrees C for 20 min. Moreover, the peak hardness and tensile properties can also be greatly enhanced after adding 3.0 wt% Zn even exhibiting a ductile fracture feature in the peak-aged state. No precipitates of the Al-Zn-Mg alloy system appear in the Zn-added Al-Mg-Si-Cu alloys after aging at 185 A degrees C, and pre-beta aEuro(3), beta aEuro(3), and L precipitates are still the main precipitates in the two alloys after peak aging treatment. Finally, based on the microstructural evolution, a schematic diagram of precipitation in the Al-Mg-Si-Cu-Zn alloy is put forward, and the relationship between mechanical properties and microstructure is also established.