Estimation of thermal expansion properties of quasicrystalline alloys

By investigating the thermal expansion properties of three quasicrystalline alloys Al 65 Cu 20 Cr 15 quenched, Al 65 Cu 20 Cr 15 cast and Al 65 Cu 20 Fe 15 cast particles reinforced Al matrix composites from 25 ℃ to 500 ℃, the thermal expansion coefficients of three quasicrystalline alloys were theoretically estimated. The results show that the thermal expansion coefficients of the composites are much lower than that of pure Al, and the thermal expansion coefficients of the composites reinforced by Al Cu Cr quasicrystalline particles are lower than those of the composites reinforced by Al Cu Fe quasicrystalline particles. According to estimating, quasicrystalline alloys have negative thermal expansion coefficients, and the thermal expansion coefficients of Al Cu Cr quasicrystalline alloys are lower than those of Al Cu Fe quasicrystalline alloys. In the alloys, the more the qusicrystalline content, the lower the thermal expansion coefficient.