We study the scaling form for the cell boundary misorientation angle distribution of Hughes and co-workers. By formulating the problem in terms of random walks in rotation space, we are able to incorporate the new cell boundaries formed during cell refinement with increasing deformation ǫ. The simplest form for the corresponding diffusion equation yields a good fit to the experimental scaling c...

Abstract In this paper, the microstructure of Mo-type seismic refractory steel for building g, as well different boundary densities and ratios, are combined with elevated-temperature mechanical properties analysis to explore laws high-temperature performance. The results show that salt water cooling (SWC) (WC) can obtain lath bainite a higher content, oil (OC) lower rate multiphase + bulk ferri...

An Al-Zn-Mg-Cu alloy without Sc or Zr additions was subjected to overaging and processing by equal channel angular pressing, obtaining a grain size of ∼160 nm and a fraction of high-angle boundaries of 56%. The high elongations attained at high strain rate (10-10 s) and low test temperature (250-300 oC) are attributed to the formation of new recrystallized grains, ∼500 nm in size, during heatin...

The growth of pentacene thin films for applications in thin-film transistors and other organic electronic devices results in a variety of extended structural defects including dislocations, grain boundaries, and stacking faults. We have used scanning tunneling microscopy STM to probe the molecular-scale structure of grain boundaries and stacking faults in a pentacene thin film on a Si 001 surfa...

Accumulative roll bonding (ARB) imposes severe plastic strain on materials without changing the specimen dimensions. ARB process is mostly appropriate for practical applications because it can be performed readily by the conventional rolling process. An Al-2wt%Cu alloy was subjected to ARB process up to a strain of 4.8. Stacking of materials and conventional roll-bonding are repeated in the pro...

In this paper, an ultra-wideband metamaterial absorber is designed and simulated. The proposed absorber is planar and low profile. It is made of a copper sheet coated with two dielectric layers. Each unit cell of the metamaterial structure is composed of multiple metallic split rings, which are patterned on the top and middle boundaries of the dielectrics. The designed absorber utilizes differe...

Grain orientation and grain boundary misorientation distributions in high critical current density, high-temperature superconductors were determined using electron backscatter Kikuchi diffraction. It is found that depending on the type of superconductor and the processing method used to fabricate it, there exist different scales of biaxial texture from no biaxial texture, local biaxial texture,...