Affiliation:
1. Department of Chemistry and Industrial Chemistry, University of Genoa, 16146 Genoa, Italy
Abstract
The Dy–Al–Si ternary system has been experimentally studied, as the effect of the dysprosium addition on the constitution and topology of the liquidus surface, focusing on the (Al) rich part. The system has been investigated in a composition range of up to about 58 at% silicon. The alloys constitution and the liquidus surface projection have been determined by means of scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDXS), X-ray powder diffraction (XRPD), and differential thermal analysis (DTA). This work is part of a research framework on the properties and solid–liquid phase equilibria of the R Al–Si (R: rare earth) systems. These data, along with the ternary systems isothermal section, are needed to outline the design, plan, and development of new Al–Si-based alloys. In the Dy–Al–Si system, four primary crystallization fields have been experimentally detected: (Si), DyAlxSi(2−x) (orthorhombic form), Dy2Al3Si2 (Τ2), and DyAl(3−x)Six. The following three invariant equilibria have been identified: at 566 °C the ternary eutectic L ⇆ DyAl2Si2 + (Al) + (Si), at 630 °C the U1 L+ DyAl3 ⇆ Dy2Al3Si2 + (Al), and at 562 °C the U2: L+ Dy2Al3Si2 ⇆ DyAl2Si2 +(Al) reactions. A comparison with other known R Al–Si systems has been conducted.
Subject
Inorganic Chemistry,Condensed Matter Physics,General Materials Science,General Chemical Engineering
Reference46 articles.
1. Effects of melt thermal treatment on cast Al-Si alloys: A review;Manani;Mater. Today Proc.,2022
2. Structural and mechanical properties of directionally solidified Al-Si alloys;Nikanorov;J. Mater. Eng. Perform.,2019
3. Kayitmazbatir, M., Lien, H.-H., Mazumder, J., Wang, J., and Misra, A. (2022). Effect of Cooling Rate on Nano-Eutectic Formation in Laser Surface Remelted and Rare Earth Modified Hypereutectic Al-20Si Alloys. Crystals, 12.
4. Influence of the intensity of a constant magnetic field on the process of phase formation in an aged aluminium alloy Al-Si-Cu-Fe;Osinskaya;J. Surf. Investig. X-ray Synchrotron Neutron Tech.,2022
5. Review: Effect of alloying element on Al-Si alloys;Kong;Adv. Mat. Res.,2014