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Effects of the addition of trace amounts of Sc on the microstructure and mechanical properties of Al-11.6Si alloys

机译：微量Sc对Al-11.6Si合金组织和力学性能的影响。

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摘要

The effects of the addition of trace amounts of scandium on the microstructure and mechanical properties of Al-11.6Si alloy were investigated. The results show that the iron-bearing phase of Al-11.6Si alloy without the addition of Sc in the aluminum matrix was present in the acicular form. This acicular iron-bearing phase is a hard and brittle intermetallic compound that is easily broken during the solidification process, causing serious damage in the mechanical properties (especially the ductility) of the alloy. During thermal exposure to high temperature at 250 °C for 100 h, the Al-11.6Si alloy without the addition of Sc undergoes recovery and recrystallization, reducing the mechanical strength. However, trace amounts of Sc transform the acicular iron-bearing phase of Al-11.6Si alloy into the chinese-script iron-bearing phase, thereby reducing the length and the amount of the iron-bearing phase. These factors enhance the ductility of Al-11.6Si alloy with Sc addition. In addition, it was remarkably found that a high density of L12-ordered Al3Sc precipitates are formed during thermal exposure at 250 °C for 100 h in Al-11.6Si alloy with Sc addition. The precipitation of L12-ordered Al3Sc precipitates effectively inhibited grain growth and hindered the movement of dislocations. These factors led to the Sc-containing alloy having the best mechanical properties (strength and ductility) than Al-11.6Si alloy without Sc addition during the following thermal exposure at 250 °C.
机译：研究了微量of对Al-11.6Si合金组织和力学性能的影响。结果表明，在铝基体中未添加Sc的Al-11.6Si合金的含铁相呈针状。该针状含铁相是一种硬而脆的金属间化合物，在凝固过程中容易断裂，从而严重损害了合金的机械性能（尤其是延展性）。在250°C的高温下暴露100°h的高温期间，未添加Sc的Al-11.6Si合金会发生回复和重结晶，从而降低机械强度。然而，痕量的Sc将Al-11.6Si合金的针状含铁相转变为中文字含铁相，从而减少了含铁相的长度和数量。这些因素通过添加Sc增强了Al-11.6Si合金的延展性。另外，显着地发现，在添加了Sc的Al-11.6Si合金中，在250℃下进行100 h的热暴露期间，形成了高密度的L12有序的Al3Sc析出物。 L12有序的Al3Sc沉淀物的沉淀有效地抑制了晶粒的生长并阻碍了位错的移动。这些因素导致含Sc的合金在随后的250 C热暴露下比不添加Sc的Al-11.6Si合金具有最佳的机械性能（强度和延展性）。

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