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研究了微量Sc和Ti复合合金化对Al-Mg合金显微组织与拉伸性能的影响。结果表明 :Sc和Ti复合微合金化可显著提高Al-Mg合金的强度。在Al- 5Mg合金中 ,采用Sc和Ti复合微合金化可形成Al3 (Sc ,Ti)复合粒子 ,初生Al3 (Sc ,Ti)颗粒具有极强的细化晶粒的作用 ,次生Al3 (Sc,Ti)质点强烈地钉扎位错和亚晶界 ,从而有效地抑制合金的再结晶。Sc和Ti复合微合金化还可大大促进微量Sc在Al-Mg合金中的各种强化作用。由于Ti的价格比Sc便宜很多 ,采用Sc和Ti复合微合金化可减少铝合金中Sc的加入量 ,从而降低合金的成本
The effects of micro-Sc and Ti alloying on the microstructure and tensile properties of Al-Mg alloys were investigated. The results show that the micro-alloying of Sc and Ti can significantly improve the strength of Al-Mg alloy. In Al-5Mg alloy, Al3 (Sc, Ti) composite particles can be formed by composite micro-alloying with Sc and Ti. The primary Al3 (Sc, Ti) particles have extremely fine grain size and the secondary Al3 , Ti) particles strongly pin the dislocations and subgrain boundaries, thereby effectively inhibiting the recrystallization of the alloy. Sc and Ti composite micro-alloying can also greatly promote the various Sc strengthening in Al-Mg alloy. Since the price of Ti is much cheaper than Sc, the use of Sc and Ti composite microalloying can reduce the amount of Sc in the aluminum alloy, thereby reducing the cost of the alloy