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纸质出版日期： 2024-12-25 ，
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胡铭汇，赖少波，郑文健，等.高镁铝合金焊接接头软化机制研究及软化模型的建立［J］.电焊机，2024，54（12）：8-15.
HU Minghui, LAI Shaobo, ZHENG Wenjian, et al.Study on Softening Mechanism and Establishment of Softening Model of Welding Joint of High Magnesium Aluminum Alloy[J].Electric Welding Machine, 2024, 54(12): 8-15.
为了研究高镁铝合金焊接接头的软化机制并建立其焊接软化模型，采用显微硬度测试和微观表征方法对船用高镁铝合金平板MIG焊对接接头进行分析，揭示了软化主要源于固溶强化和弥散强化的减弱。随着焊接峰值温度的升高，Mg元素固溶于晶粒中，导致晶粒畸变减小，阻碍晶格位错运动的能力下降，从而削弱了固溶强化效果。高温下Mg元素从Al基体中蒸发出并偏聚在晶界处，形成Mg富集相，降低了弥散强化效果。基于硬度变化与焊接过程中的峰值温度，建立了软化程度随焊接峰值温度变化的软化模型，并通过有限元计算验证了其准确性。
In order to study the softening mechanism of high magnesium aluminum alloy welded joints and establish their welding softening model
through microhardness testing and microscopic characterization
it is revealed that the softening mainly originates from the weakening of solid solution strengthening and dispersion strengthening. As the peak welding temperature increases
the Mg element dissolves in the grains
leading to a decrease in grain distortion and a decline in the ability to hinder lattice dislocation movement
thereby weakening the effect of solid solution strengthening. At high temperatures
the Mg element evaporates from the Al matrix and segregates at the grain boundaries
forming Mg-rich phases
which reduces the effect of dispersion strengthening. Based on the hardness changes and the peak temperature during the welding process
a softening model that varies with the peak welding temperature was established
and its accuracy was verified through finite element calculations.
高镁铝合金软化机制固溶强化弥散强化软化模型
high-magnesium aluminum alloysoftening mechanismsoftening modelsolid solution strengtheningdispersion strengthening
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