Effect of Wavelike Sloping Plate Rheocasting on Microstructures of Hypereutectic Al-18 pct Si-5 pct Fe Alloys
Effect of Wavelike Sloping Plate Rheocasting on Microstructures of Hypereutectic Al-18 pct Si-5 pct Fe Alloys
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DOI：
10.1007/s11663-011-9592-4
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发表时间：
2012-04
期刊：
影响因子：
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通讯作者：
R. Guan;Zhan-Yong Zhao;C. Lee;Qiu-sheng Zhang;Chun-ming Liu
中科院分区：
文献类型：
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作者：
R. Guan;Zhan-Yong Zhao;C. Lee;Qiu-sheng Zhang;Chun-ming Liu
为了细化和球化过共晶Al-Si-Fe合金的显微组织，提出了一种新型的波形斜板流变铸造方法，并研究了波形斜板流变铸造对过共晶Al-18%Si-5%Fe合金显微组织的影响。结果表明，WSP流变铸造可改善初生Si、Al 18 Si 10 Fe 5和Al 8 Si 2Fe相的形貌，且随着铸造温度的降低，各相均趋于细化和球化。当铸造温度在943 ~ 953 K（670 ~ 680 °C）之间时，可获得具有优良显微组织的合金铸锭。在WSP流变铸造过程中，晶核增殖、晶粒生长受到抑制和枝晶破碎同时发生，导致合金晶粒细化。
To refine and spheroidize the microstructures of hypereutectic Al-Si-Fe alloys, a novel method of wavelike sloping plate (WSP) rheocasting was proposed, and the effect of the WSP rheocasting on the microstructures of hypereutectic Al-18 pct Si-5 pct Fe alloys was investigated. The results reveal that the morphologies of the primary Si crystal, the Al18Si10Fe5, and the Al8Si2Fe phases can be improved by the WSP rheocasting, and various phases tend to be refined and spheroidized with the decrease of the casting temperature. The alloy ingots with excellent microstructures can be obtained when the casting temperature is between 943 K and 953 K (670 °C and 680 °C). During the WSP rheocasting, the crystal nucleus multiplication, inhibited grain growth, and dendrite break-up take place simultaneously, which leads to grain refinement of the alloys.