Sentences with phrase «level grain boundary»

Prior studies of atomic - level grain boundary and segregation structures have been mostly focused on small - angle or special symmetrical tilt and twist boundaries with high symmetries and well - defined periodicities in artificial bicrystals.

Not exact matches

But researchers showed that it is enabled by faceting, as well as the formation of atomic - level steps at the grain boundaries, which allows separate interfacial reconstructions to occur at both terminating grain surface planes in a unique «bilayer» interfacial phase (wherein an «interfacial phase» refers to a thermodynamically 2 - D phase spontaneously - formed at an interface, which is also called a «complexion»).

This somewhat surprising discovery enriches our fundamental knowledge of the atomic - level segregation structures at general grain boundaries, which are important in controlling a broad range of mechanical and physical properties of polycrystalline alloys.

The formation of such ordered superstructures and the associated interfacial reconstructions that change the 2 - D translational symmetries at both terminating grain planes, which had been thought impossible to be realized at general grain boundaries that should be lacking a long - range translational symmetry according to the classical theories in physical metallurgy, are enabled by faceting, as well as the formation of atomic - level steps at the grain boundaries.