Thermal expansion of Al3Sc and Al3(Sc0.75X0.25)

Abstract The thermal expansion coefficient of Al 3 Sc and Al 3 (Sc 0.75 X 0.25 ), where X is Ti, Y, Zr or Hf, was measured by dilatometry between 25 and 1000 °C. The measured value, (16±1)×10 −6 K −1 , is constant between 25 and 900 °C and insensitive to alloying element. Good agreement is found with a literature value determined from first-principle calculations.