STUDY OF ER AND HF ADDITIONS EFFECT ON AS-CAST MICROSTRUCTURE AND MECHANICAL PROPERTIES OF 1590 MAGNESIUM-RICH ALUMINUM ALLOY WITH LEAN SCANDIUM ADDITION
VBINRL
DOI:
https://doi.org/10.25712/ASTU.2072-8921.2023.04.025Keywords:
aluminum alloys, microstructure, hafnium, erbium, scandium, intermetallic compounds, crystallization, mechanical propertiesAbstract
The study addresses the effect of erbium and hafnium on as-cast microstructure of 1590 magnesium-rich alloy with lean scandium addition. 9 ingots modifications with different hafnium and erbium contents have been cast in a steel mold for the study purposes. It is established, that dendritic structure with ≈373 µm grain size forms in 1591 alloy without hafnium and erbium additions. 1590 alloy grain refinement starts upon hafnium and erbium addition. At 0.16 (%, weight) Hf and Er content fine grain (with 32-38µm grain size) non-dendritic structure forms in 1590 alloy. Besides, such elements addition causes Al3Sc intermetallic compound amount and size increase, thus leading to as-cast structure modification. This is mainly explained by the capability of Er and Hf, similarly to zirconium, to reduce concentration of scandium, required for Al3Sc-type primary intermetallic compounds forming. At the same time grain refinement does not lead to strength improvement and deteriorates plastic properties due to large amount of the above intermetallic compounds
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