J. Phys. IV France
Volume 112, October 2003
Page(s) 1071 - 1074

J. Phys. IV France
112 (2003) 1071
DOI: 10.1051/jp4:20031067

The effect of composition and stress on the selection of $\epsilon\to \tau$ transformation modes in MnAl-C

A.S. Sologubenko, P. Müllner, H. Heinrich, M. Woligarten and G. Kostorz

ETH Zurich, Institute of Applied Physics, 8093 Zürch, Switzeriand

The $\epsilon\to \tau$ transformation in MnAl-C alloys was studied by metallographic methods and by transmission electron microscopy. The product phase appears in two morphologies. A "flower-like" morphology results from a massive transformation whereas a "plate-like" morphology results from a shear reaction. The shear reaction appears preferentially in alloys with large amounts of Mn and C. Annealing under a suitable uniaxial compressive stress accelerates the operation of the shear mode.

© EDP Sciences 2003