The Al-Zn-Mg-Cu alloy with high Zn content was cast at different temperature gradients by directional solidification. The primary dendrite arm spacing λ1, the secondary dendrite arm spacing λ2, and the Vickers hardness of specimens were characterized. Based on the experiment results, the relationship among temperature gradient, dendritic arm spacing, and microhardness was determined by linear regression analysis and curve fitting analysis. The results are in agreement with the dendritic growth theoretical models, and the solidification parameters of Al-Zn-Mg-Cu alloy were obtained. In addition, the influence mechanism of temperature gradient on microhardness was analyzed. The results have a guidance function on the optimization of preparing methods of Al-Zn-Mg-Cu alloy with high zinc content.
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王熠璇,贾丽娜,张虎.温度梯度对定向凝固Al-Zn-Mg-Cu合金微观组织和硬度的影响[J].稀有金属材料与工程,2021,50(11):3910~3916.[Wang Yixuan, Jia Lina, Zhang Hu. Influence of Temperature Gradient on Microstructure and Microhardness of Directionally Solidified Al-Zn-Mg-Cu Alloy[J]. Rare Metal Materials and Engineering,2021,50(11):3910~3916.] DOI:[doi]