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采用Monte Carlo模拟方法研究了微量Sc、Zr对Al-2.1Zn-1.4Mg合金时效初期微结构演变的影响。结果表明:Al-2.1Zn-1.4Mg合金时效初期出现了Zn/Mg原子短程有序排布的共同团簇。由于“Sc/空位”机制,添加微量Sc后抑制了Al-2.1Zn-1.4Mg合金时效初期Zn/Mg共同团簇的偏聚,而微量Zr对时效初期Zn/Mg共同团簇的影响并不明显。微量Sc的添加使Al-2.1Zn-1.4Mg合金大量空位被Sc捕捉,形成Sc/空位团簇,剩余的空位与Zr原子和Mg原子结合,而Zn原子一般不容易被空位捕捉。Mg原子容易向Sc/空位团簇偏聚,Zn原子次之,Zr原子向Sc/空位团簇聚集的可能性较小。
The effects of trace amounts of Sc and Zr on the microstructure evolution of Al-2.1Zn-1.4Mg alloy during initial aging were studied by Monte Carlo simulation. The results show that the common clusters of Zn / Mg atoms appear in short-range order at the initial stage of Al-2.1Zn-1.4Mg alloy aging. Due to the “Sc / vacancy” mechanism, the addition of trace Sc inhibited the segregation of Zn / Mg co-clusters at the initial stage of Al-2.1Zn-1.4Mg aging, while the effect of micro-Zr on the initial Zn / Mg co- Not obvious. The addition of trace amount of Sc allows the large number of vacancies in Al-2.1Zn-1.4Mg alloy to be captured by Sc, forming Sc / vacancy clusters. The remaining vacancies combine with Zr and Mg atoms, while Zn atoms are not easily trapped by vacancies. Mg atoms tend to segregate to Sc / vacancy clusters, followed by Zn atoms and Zr atoms to Sc / vacancy clusters are less likely to aggregate.