Phase equilibria of the Al-Si-La system between 0 and 50 at.% La at 600 and 800 °C

The 600 and 800 degrees C isothermal the sections of Al-Si-La ternary system between 0 and 50 at.% La have been established via a combination of electron microprobe analysis and X-ray powder diffraction. A total of three ternary compounds were confirmed in this work and temporally designated tau(1), tau(2) and tau(3). The three ternary compounds (tau(1)-tau(3)) were found at 600 degrees C. The ternary phase tau(1) spans 43.3 at.% to 61.5 at.% Al, 5.0 at.% to 21.3 at.% Si, and 33.5 at.% to 35.5 at.% La. One ternary compound, tau(1), was identified at 800 degrees C. The tau(1) phase spans 43.6 at.% to 62.6 at.% Al, 4.1 at.% to 22.5 at.% Si, and 33.1 at.% to 35.2 at.% La. The solubility of Al in LaSi(2-)(x2)( )is 39.9 at.% and 41.3 at.% at 600 and 800 degrees C, respectively. The solubility of Si in Al2La at both 600 and 800 degrees C is extremely small. (C) 2018 Elsevier B.V. All rights reserved.