700 °C isothermal section of Al–Cr–Si ternary phase diagram

Abstract

The isothermal section of Al–Cr–Si system at 700°C was determined by means of scanning electron microscopy coupled with energy dispersive X-ray spectroscopy and X-ray powder diffraction. In the 700°C isothermal section, fourteen three-phase regions exist, three ternary compound named τ1, τ2 and τ3 are confirmed to be stable and the Al11Cr2 phase is not observed in this section. The solubility of Si in AlCr2 is relatively low in the Al–Cr–Si system, but the CrSi2 phase possesses a relatively high solubility of Al. The maximum Al solubility in CrSi2, CrSi and Cr5Si3 at 700°C reaches 25.9, 3.5 and 9.0at.%, respectively.