ABSTRACT The effect of transition elements, specifically Mn, Cr, V, and Mo, on dispersoid formation and mechanical properties in 6082 aluminum alloy was studied. The elevated-temperature mechanical properties were evaluated based on the compressive yield strength and creep resistance. The results indicated that the addition of Mn to the 6082 alloy resulted in the formation of a large number of the thermally stable α-Al(MnFe)Si dispersoids, thereby significantly improving the elevated-temperature mechanical properties of the alloy. Subsequent additions of Cr, V, and Mo increased the amount of Mn-bearing intermetallic phases, which decreased the supersaturation levels of Mn and Si in the α-Al, and consequently decreased the volume fraction of the dispersoids. The alloys containing Cr, V, and Mo exhibited similar yield strengths at 300°C and higher yield strengths at room temperature compared to the alloy containing only Mn. The size effect of the smaller dispersoids containing Cr, V, and Mo together with the solid-solution hardening of these elements could balance out the strength decrease resulting from the decreased volume fraction of the dispersoids. The additions of Cr, V, and Mo significantly increased the creep resistance of the Mn-containing 6082 alloy. Vanadium induced the highest creep resistance followed by Cr and Mo. Solute atoms of these elements with low diffusivity in the aluminum matrix contributed significantly to increasing the creep resistance at 300°C.

中文翻译：

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过渡元素对6082铝合金弥散体形成及高温力学性能的影响

摘要 研究了过渡元素，特别是 Mn、Cr、V 和 Mo，对 6082 铝合金弥散体形成和力学性能的影响。基于压缩屈服强度和抗蠕变性评估高温机械性能。结果表明，6082合金中Mn的加入导致形成了大量热稳定的α-Al(MnFe)Si弥散体，从而显着提高了合金的高温力学性能。随后添加 Cr、V 和 Mo 增加了含 Mn 的金属间相的数量，从而降低了 α-Al 中 Mn 和 Si 的过饱和水平，从而降低了弥散体的体积分数。含铬、钒、与仅含 Mn 的合金相比，Mo 在 300°C 下表现出相似的屈服强度，在室温下表现出更高的屈服强度。含有 Cr、V 和 Mo 的较小弥散体的尺寸效应以及这些元素的固溶硬化可以抵消因弥散体体积分数降低而导致的强度降低。Cr、V 和 Mo 的添加显着提高了含锰 6082 合金的抗蠕变性。钒诱导最高的抗蠕变性，其次是铬和钼。这些元素的溶质原子在铝基体中具有低扩散性，显着提高了 300°C 的抗蠕变性。Mo 与这些元素的固溶硬化一起可以抵消由于弥散体体积分数降低而导致的强度下降。Cr、V 和 Mo 的添加显着提高了含锰 6082 合金的抗蠕变性。钒诱导最高的抗蠕变性，其次是铬和钼。这些元素的溶质原子在铝基体中具有低扩散性，显着提高了 300°C 的抗蠕变性。Mo 与这些元素的固溶硬化一起可以抵消由于弥散体体积分数降低而导致的强度下降。Cr、V 和 Mo 的添加显着提高了含锰 6082 合金的抗蠕变性。钒诱导最高的抗蠕变性，其次是铬和钼。这些元素的溶质原子在铝基体中具有低扩散性，显着提高了 300°C 的抗蠕变性。