化学成分对Al-Si及Al-Si-Mg合金热裂敏感因子的影响
长江师范学院, 材料科学与工程学院, 重庆 408100
| 摘 要： | 为合理设计Al-Si基合金成分，研究合金元素对Al-Si基合金热裂的影响。采用Pandat计算软件，计算了不同Si含量对Al-Si合金热裂敏感因子的影响，计算了Mg合金的加入对合金热裂敏感的影响。对影响合金热裂敏感因子的凝固路径进行了分析。计算结果表明：Si含量在10%（质量百分比）以下，热裂敏感因子基本不存在，合金不会出现热裂倾向；当Si含量达到11~12%时，合金的热裂敏感因子很小。当Si含量达到过共晶区域时（Si≥13%），合金热裂敏感因子开始增加，且随Si元素含量的增加而增加，合金在过共晶区的热裂倾向较大。加入Mg可以有效减少合金的热裂敏感因子，且随Mg含量的增加，热裂敏感因子逐渐减小。 |
| 关 键 词： | Al-Si合金; Al-Si-Mg合金; 热裂敏感因子; 化学成分; 凝固 |
| DOI： | 10.57237/j.mater.2022.02.005 |
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收稿日期: 2022-11-28
接受日期: 2023-01-16
在线出版日期: 2023-02-03
Effect of Composition on Crack Susceptibility Index of Al-Si and Al-Si-Mg Alloys
College of Materials Science and Engineering, Yangtze Normal University, Chongqing 408100, China
| Abstract: | In order to reasonably design the composition of Al-Si based alloy and study the effect of alloying elements on hot crck of Al-Si based alloys, the effect of alloying elements on hot cracking of Al-Si based alloy was studied. The influence of different Si contents on the crack susceptibility index (CSI) of Al-Si alloy was calculated by using Pandat, and the influence of Mg addition on the CSI of the Al-Si-Mg alloy was also calculated. The solidification path affecting the CSI of the alloy was analyzed. The results show that when the Si content is below 10% (mass percentage), the CSI is almost non-existent and the Al-Si alloy will not show crack tendency; When the Si content reaches 11~12%, the CSI of the Al-Si alloy is very small. When the Si content reaches the hypereutectic region (Si ≥ 13%), the CSI of the Al-Si alloy begin to increase with increasing of Si content. The crack tendency of the Al-Si alloy in the hypereutectic region is larger. Adding Mg can effectively reduce the CSI of the alloy. Furthermore, with increasing of Mg content, the CSI of Al-Si-Mg alloy gradually decreases. |
| Keywords: | Al-Si Alloy; Al-Si-Mg Alloy; Crack Susceptibility Index; Composition; Solidification |
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