Deformation mechanisms in a new disc superalloy at low and intermediate temperatures

The deformation microstructures of a new disc superalloy, TMW-4M3, have been investigated by transmission electron microscopy at temperatures ranging from 25 to 725 degrees C. Dislocation pairs cutting was the dominant mechanism at 25 degrees C, whereas stacking faults and deformation twinning were the main mechanisms at 650 and 725 degrees C, respectively. The factors that affect the transition of deformation mechanisms are discussed. The deformation processes involving planar defects may enhance the yield strength of TMW-4M3 at intermediate temperatures. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.