Journal
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
Volume 51, Issue 8, Pages 4158-4167Publisher
SPRINGER
DOI: 10.1007/s11661-020-05827-9
Keywords
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Funding
- Natural Science Foundation of Shandong Province of China [ZR2016EEM48]
- Major Project of Shandong Science and Technology [2015ZDZX03004]
- Key R&D Program of Shandong Province of China [2019QYTPY057, 2017CXGC0401]
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In this research, the influence of Zn on the microstructure and mechanical properties of Al-Si-Cu-Mg alloys under different solidification rates was investigated. Differential scanning calorimetry was used to detect the nucleation and growth of eutectic Si, while scanning electron microscopy was used to analyze Fe-rich phases. Two growth models were deduced to explain the modification of the eutectic Si and Fe-rich phases upon the addition of Zn. The results show that an addition of 0.6 wt pct Zn modified the eutectic Si from flake like and fibrous to micron- and submicron-granular structures, depending on the different secondary dendrite arm spacings of similar to 33 mu m and similar to 16 mu m, respectively. For the Fe-rich phases under steel mold casting conditions, beta-Al5FeSi was modified into pi-Al8FeMg3Si6 upon adding 0.6 wt pct Zn. Under sand mold casting conditions, the 0.6 wt pct Zn addition only refined the size of the beta-Al5FeSi. The Zn addition significantly improved the ultimate tensile strength and elongation. The excellent modification effect of Zn on the eutectic Si and Fe-rich phases was attributed to the fact that the reaction of the Zn-Si eutectic on the {111}(Si) planes forced the Si atoms from these phases into the eutectic droplets.
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