PRODUCTION OF ALUMINUM ALLOYS MODIFICATOR FROM LIGATURE
The paper presents the research results of obtaining aluminum alloys modificators. Complex ligature AKCe (wt.%: 30 Al, 28 REM, 4 Ca, the rest is Ni), which is a traditional additive in cast irons, was used as а metallurgical charge for obtaining new modifying alloys. The melting point of the master alloy used in the experiments is 1400 °C. Modifying alloys from ligature were obtained in two ways. In the first way, aluminum (A7) was melted, and then different amounts of AKCe powder were added to
... owder were added to the superheated (1400 °C) aluminum melt. In the second method different amounts of aluminum (A7) were added to the molten (1400 °C) master alloy. The melting was carried out in Tamman furnace where a protective atmosphere of technically pure argon was created. In both methods of producing the modifier, the component was added in the amount of 20% to 70% by weight. The element composition analysis of the resulting alloys showed that, when adding 60 wt. % (AKCe or A7) the element composition and melting point were not significantly different, regardless of the production method having been used. The micro-X-ray spectral analysis showed that the initial ligature alloy consisted of intermetallides Al-Ni-RZM, Al-Ni and Al-Ca. The obtained alloys, regardless of the method of their production, consisted of an α-solid solution of Ni in Al and intermetallides of Al-Ni, where instead of the intermetallic compound AlNi the intermetallide Al3Ni was formed which appeared to have a lower melting point and better plastic properties.