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

Abstract The 600 and 800 °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 τ 1 , τ 2 and τ 3. The three ternary compounds (τ 1 -τ 3 ) were found at 600 °C. The ternary phase τ 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, τ 1 , was identified at 800 °C. The τ 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-α2 is 39.9 at.% and 41.3 at.% at 600 and 800 °C, respectively. The solubility of Si in Al 2 La at both 600 and 800 °C is extremely small. Highlights • Phase equilibria of the Al-Si-La system between 0 and 50 at.% La at 600 and 800 °C were determined. • Three ternary compounds (τ 1 , τ 2 and τ 3 ) were confirmed at 600 °C, only the τ 1 phase exists at 800 °C. • The solubility of Al in LaSi 2-α2 and LaSi increases with the enhanced temperature. [ABSTRACT FROM AUTHOR]