亚共晶Al-Mg-Si合金中Sc的多步形核及多重改性作用

Multistep nucleation and multi-modification effect of Sc in hypoeutectic Al-Mg-Si alloys.

作者信息

Trudonoshyn Oleksandr, Prach Olena

机构信息

Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstraße 5, 91058, Erlangen, Germany.

Vyatskiy State University, Moscow Street 36, 610000, Kirov, Kirov Region, Russia.

出版信息

Heliyon. 2019 Feb 15;5(2):e01202. doi: 10.1016/j.heliyon.2019.e01202. eCollection 2019 Feb.

DOI:10.1016/j.heliyon.2019.e01202

PMID:30815596

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6378345/

Abstract

Structure of Al5Mg2SiMn casting alloy with and without of Sc addition, morphology of primary phases and specifically morphology of the Sc-containing intermetallic compounds and nanoscale properties of the α-Al matrix of Al-Mg-Si-Mn alloys were observed. Morphology and chemical composition were investigated by scanning electron microscopy on polished and deep etched microsections. It was found that addition of Sc changes morphology of α-Al, Al-MgSi eutectic and intermetallic compounds with Mn. α-Al dendrites change their morphology to spherical, lamellar Al-MgSi eutectic to fine fibrous eutectic. It was found that crystals AlSc can act as nucleating particles of α-Al grains, as well as MgSi eutectic fibrous. The mechanisms of nucleation can be attributed to heterogeneous nucleation.

摘要

观察了添加和未添加Sc的Al5Mg2SiMn铸造合金的组织、初生相的形态，特别是含Sc金属间化合物的形态以及Al-Mg-Si-Mn合金α-Al基体的纳米级性能。通过扫描电子显微镜对抛光和深度蚀刻的金相试样进行形貌和化学成分研究。结果发现，添加Sc会改变α-Al、Al-MgSi共晶和含Mn金属间化合物的形态。α-Al枝晶形态变为球形，层片状Al-MgSi共晶变为细纤维状共晶。发现AlSc晶体可作为α-Al晶粒以及MgSi共晶纤维的形核颗粒。形核机制可归因于异质形核。