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Influence of heat treatment and its sequence on elevated-temperature properties of Al-Mn-Mg 3004 alloy

机译：热处理及其顺序对Al-Mn-Mg 3004合金高温性能的影响

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摘要

Various heat treatments with different sequences between the peak precipitation treatment (375℃/48h, referred to as "P") and the high temperature treatment (450-600 ℃, referred to as "H") were performed in Al-Mn-Mg 3004 alloys to simulate their thermal treatments during thermomechanical fabrication processes in the present work. Their influences on the dispersoid precipitation and elevated-temperature properties (yield strength and creep resistance at 300 ℃) were investigated. The results indicate that the size of dispersoids increased while the volume fraction of dispersoids decreased with increasing "H" temperature when "P" was performed either prior to or after "H" (denoted as "PH" and "HP", respectively), which results in the reduction of the elevated-temperature properties. However, the yield strength and creep resistance after "PH" treatments were always higher than those after "HP" treatments at the same "H" temperature. When the "H" temperature during "PH" treatments is controlled below 500 ℃, the materials can still maintain the appropriate yield strength and creep resistance, providing the possibility for Al-Mn-Mg 3004 alloy to adapt to the conventional fabrication processes but still maintain high elevated-temperature properties.
机译：在Al-Mn-Mg中进行了各种热处理，在峰值析出处理（375℃/ 48h，称为“ P”）和高温处理（450-600℃，称为“ H”）之间以不同的顺序进行。 3004合金可在当前工作中模拟热机械制造过程中的热处理。研究了它们对分散相沉淀和高温性能（300℃下的屈服强度和抗蠕变性）的影响。结果表明，当在“ H”之前或之后执行“ P”（分别表示为“ PH”和“ HP”）时，随着“ H”温度的升高，弥散体的尺寸增加，而弥散体的体积分数减小，这导致高温性能降低。然而，在相同的“ H”温度下，“ PH”处理后的屈服强度和抗蠕变性始终高于“ HP”处理后的屈服强度和抗蠕变性。当将“ PH”处理过程中的“ H”温度控制在500℃以下时，材料仍可保持适当的屈服强度和抗蠕变性，为Al-Mn-Mg 3004合金适应常规制造工艺提供了可能性，但仍然保持较高的高温性能。

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