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Precipitation behavior of L1(2) Al3Zr phase in Al-Mg-Zr alloy

机译：Al-Mg-Zr合金中L1（2）Al3ZR相的沉淀行为

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摘要

Increasing the recrystallization resistance and the mechanical properties of aluminum-based alloys is possible due to the formation of a nanoscale L1(2)-structured Al3Zr phase. Treatment conditions and alloys composition affect the size and density of dispersoids and their final properties. In this work we analyze the decomposition of the supersaturated solid solution in the as-cast Al-3%Mg-0.25%Zr alloy for different annealing modes to understand the precipitation kinetics of the Al3Zr phase in the presence of Mg. We found that both discontinuous and continuous precipitation mechanisms of the Al3Zr phase are possible in the studied low-alloyed material. One-step annealing leads to the formation of coarse (17 nm) spherical precipitates of a coherent L1(2)-structured Al3Zr phase and discontinuously formed fan-shaped aggregations of the same phase. Two-step annealing provided for the maximum precipitation hardening with the formation of high-density nanoscale (7 nm) dispersoids of the Al3Zr phase. This study highlights the importance of the annealing mode of the as-cast material for achieving a high density of the fine L1(2) structured Al3Zr phase and the maximum hardening effect.
机译：由于形成纳米级L1（2）结构的Al3ZR相，增加铝基合金的重结晶抗性和机械性能。治疗条件和合金组合物影响分散体的尺寸和密度及其最终性质。在这项工作中，我们分析了在铸型Al-3％Mg-0.25％Zr合金中的超饱和固溶体的分解，以了解不同退火模式，以了解Mg存在下Al3Zr相的沉淀动力学。我们发现，在研究的低合金化材料中可以进行Al3Zr相的不连续和连续的沉淀机制。一步退火导致形成粗（17nm）球形沉淀物的相干L1（2）结构的Al3ZR相和相同相的不连续形成的扇形聚集。两步退火为最大沉淀硬化的沉淀硬化与Al3Zr相的高密度纳米级（7nm）分散体的形成。该研究突出了铸造材料的退火模式的重要性，用于实现细小L1（2）结构化AL3ZR相的高密度和最大硬化效果。

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