International Seminar on Mechanics and Mechanisms of Solid-Solid Phase Transformations
J. Phys. IV France 06 (1996) C1-149-C1-156
Inhomogeneity of Phase Transformations β→ω and β→α in the Quenched Cold-Rolled Alloy Zr-20 %NbYu. Perlovich1, H.J. Bunge2, V. Fesenko1, M. Isaenkova1, N.J. Park2, L. Wcislak2 and M. Zuev2
1 Moscow Engineering Physics Institute, Kashirskoe shosse 31, 115409 Moscow, Russia
2 Institut für Metallkunde und Metallphysik, TU Clausthal, Grosser Bruch 23, 38678 Clausthal-Zellerfeld, Germany
The inhomogeneous character of phase transformations in the quenched cold-rolled alloy Zr - 20%Nb was investigated using new X-ray diffractometric procedures based on a position sensitive detector. It was shown that the distribution of strain hardening in β-grains with different orientations controls the development of phase transformation β→α and β→ω in the rolled alloy. Derivative phases inherit the substructure inhomogenity of the β-phase, i.e. their grains are most dispersive and/or have the most distorted crystalline lattice in texture minima, where both phase transformations develop primarily. To explain the obtained X-ray texture data a mechanism was suggested involving local formation of quasi-amorphous boundary interlayers by cold rolling and their crystallization by annealing.
© EDP Sciences 1996