Author/Authors :
Mattern، نويسنده , , N. and Han، نويسنده , , J.H. and Zinkevich، نويسنده , , M. and Shuleshova، نويسنده , , O. and Kaban، نويسنده , , I. and Holland-Moritz، نويسنده , , D. and Gegner، نويسنده , , J. and Yang، نويسنده , , F. and Bednar?ik، نويسنده , , J. and L?ser، نويسنده , , W. and Eckert، نويسنده , , J.، نويسنده ,
Abstract :
The phase equilibria of the binary Gd–Zr system have been investigated by combining electrostatic levitation of the melt with in situ high energy synchrotron X-ray diffraction. The liquidus line was experimentally assessed between 1500 and 1800 K from the diffraction data. At T=1495±10 K the eutectic reaction L↔bcc-Gd+bcc-Zr is evident. The eutectic composition x=18±2 at% Zr is determined from the in situ diffraction data and confirmed by the analysis of the microstructure of cast alloys. The so far unknown coexistence of bcc-Gd and bcc-Zr is observed for the temperature range 1450 K<T<1495 K. Based on the experimental data an improved Gd–Zr phase diagram is derived and a thermodynamic description of the binary system is presented.
Keywords :
CALPHAD , Thermodynamic assessment , In situ X-ray diffraction , phase diagram , Gd–Zr
