The low temperature deformation microstructure of TiAl is dominated by the presence of stacking fault dipoles [I]. Two different faulted dipole geometries have been proposed in the literature [2,3], and the existence of both types of faulted dipoles have been verified in the present study with comparisons to computer simulated images. These comparisons suggest that extrinsic stacking faults in ...

Introduction The mechanical properties of austenitic stainless steels, including the low cyclic fatigue behavior have been a subject of numerous studies [1-8]. Nitrogen addition, in general, increases the fatigue strength by decreasing the stacking fault energy of austenitic stainless steels [6]. The stacking fault energy has a strong influence on the cross slip difficulty, thus it affects the ...

Basic factors that influence the physical metallurgy and the mechanical properties of cobalt-base alloys are discussed in this study; these factors include the coherency of the interphase interface, the stacking fault energy, and the average electron hole number. Control of these factors and considerations of corrosion resistance and body compatibility determined the compositions for alloys tha...

The application of the weak-beam method of electron microscopy to the measurement of the separation of partial dislocations 2 2.0 nrn is discussed. The accuracy of the experimental results is analysed, and approximations in obtaining values of the stacking-fault energy, y, are outlined.

We studied nucleation and growth of Ag precipitates in a Cu-6 wt%Ag-0.15 wt%Sc alloy found that the early was similar to continuous precipitation it occurred only on dislocations within Cu grains, not any grain boundaries. In aged samples, we observed stacking faults extended into nanotwins. These planar defects formed during surrounding matrix. The formation released misfit strain Cu/Ag interf...