Isotopic alloying to tailor helium production rates in mixed-spectrum reactors

Isotopic alloying is examined as a means of manipulating the ratio of helium transmutations to atom displacements in mixed spectrum reactors. The application explored is based on artificially altering the relative abundances of the stable isotopes of nickel to systematically vary the fraction of ⁵⁸Ni in nickel-bearing alloys. The method of calculating helium production rates is described. Results of example calculations for several experiments are discussed. Both increased understanding of mechanisms and the development of materials for fusion reactor applications, by testing in parameter regimes of direct interest, appear to be possible.     

Retention of the Twinning Σ3 Misorientation in the Process of Lattice Transformation during Cold Rolling of a Fe3 Pct Si Single Crystal

The article investigates the twinning evolution of two active systems during cold rolling of a (110)[001]-oriented Fe3 pct Si single crystal. An intriguing fact is revealed that for both twinning systems the Σ3 misorientation is retained, regardless of the fundamental difference in their transformation in the course of the matrix crystal lattice reorientation. One of the twinning systems retains the regular habit plane position, while the other acquires an irregular one. A model is proposed that describes the mechanism of such transformations.