Al-Si合金共晶形核与生长机制研究
发布时间：2019-03-15 21:23
【摘要】：Al-Si二元共晶反应发生在凝固后期,共晶(团)晶粒的形核、生长都直接影响缩松、热裂等缺陷的形成、杂质元素及化合物的分布等。对Al Si10.5亚共晶合金进行Sr变质,对未变质与变质合金进行微观组织观察和EBSD分析,并对未变质合金进行热分析。结果表明:无论变质与否,共晶在初生枝晶上形核和在枝晶间异质上形核的这两种情况都存在,并且Sr对初生α-Al有明显的变质效果,富Fe相可能对共晶Si相形核有较大影响。
[Abstract]:The binary eutectic reaction of Al-Si occurs at the late solidification stage. The nucleation and growth of eutectic (cluster) grains directly affect the formation of defects, such as shrinkage, hot cracking, and the distribution of impurity elements and compounds. The Al Si10.5 hypoeutectic alloy was modified by Sr, the microstructure and EBSD analysis of the unmodified and modified alloy were carried out, and the thermal analysis of the unmodified alloy was carried out. The results show that both eutectic nucleation on primary dendrite and heterogeneous nucleation between dendrites exist, and Sr has obvious metamorphism effect on primary 伪-Al. The Fe-rich phase may have a great influence on the nucleation of eutectic Si phase.
【作者单位】： 盐城工业职业技术学院汽车工程学院;
【分类号】：TG146.21
[Abstract]:The binary eutectic reaction of Al-Si occurs at the late solidification stage. The nucleation and growth of eutectic (cluster) grains directly affect the formation of defects, such as shrinkage, hot cracking, and the distribution of impurity elements and compounds. The Al Si10.5 hypoeutectic alloy was modified by Sr, the microstructure and EBSD analysis of the unmodified and modified alloy were carried out, and the thermal analysis of the unmodified alloy was carried out. The results show that both eutectic nucleation on primary dendrite and heterogeneous nucleation between dendrites exist, and Sr has obvious metamorphism effect on primary 伪-Al. The Fe-rich phase may have a great influence on the nucleation of eutectic Si phase.
【作者单位】： 盐城工业职业技术学院汽车工程学院;
【分类号】：TG146.21
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