Chunyu Yue, Bowen Zheng, Ming Su, Yuxiang Wang, Xiaojiao Zuo, Yinxiao Wang, Xiaoguang Yuan
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引用次数: 0
Abstract
In this work, the Al–Cu–Mg alloy with different Y (0–0.2 wt%) and Ce (0.5–1.5 wt%) are designed. The effect of mixed addition of Y and Ce on the grain structure and hot tearing for Al–4.4Cu–1.5Mg–0.15Zr alloy was investigated using "cross" hot tearing mould. The results indicate that as rare earth Y and Ce increases, the grain size becomes finer, the grain morphology changes from dendrite to equiaxed grain, and effectively reduce the hot tearing sensitivity coefficient (HTS1) and crack susceptibility coefficient (CSC) of the alloy. With the increase of Ce element (0.5–1.5 wt%), the hot tearing susceptibility of the alloy decreases first and then increases. With the increase of Y element (0–0.2 wt%), the hot tearing sensitivity of the alloy decreases. When the content of rare earth is 0.2 wt% Y + 1.0 wt% Ce, the minimum HTS1 value and CSC value of the alloy are 68 and 0.53, respectively. Rare earth Ce refines the alloy microstructure, shortens the feeding channel, and reduces the hot tearing initiation. Meanwhile, the rare earth Y can form Al6Cu6Y phase at the grain boundary, improve the feeding capacity of the alloy. Therefore, appropriate addition of rare earth Y and Ce can effectively reduce the hot tearing tendency of the alloy.
摘要 本研究设计了不同Y（0-0.2 wt%）和Ce（0.5-1.5 wt%）含量的Al-Cu-Mg合金。采用"cross"热撕裂模具研究了混合添加 Y 和 Ce 对 Al-4.4Cu-1.5Mg-0.15Zr 合金晶粒结构和热撕裂的影响。结果表明，随着稀土元素 Y 和 Ce 的增加，合金晶粒尺寸变细，晶粒形态由树枝状转变为等轴晶粒，并有效降低了合金的热撕裂敏感系数（HTS1）和裂纹敏感系数（CSC）。随着 Ce 元素（0.5-1.5 wt%）的增加，合金的热撕裂敏感性先降低后升高。随着 Y 元素（0-0.2 wt%）的增加，合金的热撕裂敏感性降低。当稀土含量为 0.2 wt% Y + 1.0 wt% Ce 时，合金的最小 HTS1 值和 CSC 值分别为 68 和 0.53。稀土 Ce 细化了合金的微观结构，缩短了进料通道，减少了热撕裂的发生。同时，稀土 Y 能在晶界形成 Al6Cu6Y 相，提高合金的送料能力。因此，适当添加稀土 Y 和 Ce 能有效降低合金的热撕裂倾向。
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This international journal presents compact reports of significant, original and timely research reflecting progress in metallurgy, materials science and engineering, including materials physics, physical metallurgy, and process metallurgy.
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