An atom probe study on Nb solute partitioning and nanocrystalline grain stabilization in mechanically alloyed Cu-Nb

Oscillations of the superconducting critical current in Nb-Cu-Ni-Cu-Nb junctions.

We report on experimental studies of superconductor-ferromagnet layered structures. Strong oscillations of the critical supercurrent were observed with the thickness variation of the ferromagnet. Using known microscopic parameters of Ni, we found reasonable agreement between the period of oscillations and the decay of the measured critical current, and theoretical calculations.

Microstructure, Hardness Evolution, and Thermal Stability Mechanism of Mechanical Alloyed Cu-Nb Alloy during Heat Treatment

The microstructure, hardness evolution, and thermal stability of mechanically alloyed (MA-ed) nanocrystalline Cu–10 wt %Nb solid solution during heat treatment were examined using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution TEM (HRTEM) observations, and microhardness measurement. It is found that the pronounced precipitati...

Mössbauer Investigation of Segregation and Diffusion Mechanism of Sn in Poly- and Nanocrystalline Nb Grain Boundaries

1. Introduction Recently a method based on the emission Mössbauer spectroscopy of radioisotope nuclei inserted in grain boundaries worked out by Klotsman and Kaigorodov [1] was successfully employed in a number of studies of grain boundaries in transition and noble metals. In the present investigation this method is used to study the diffusion mechanism and grain boundary segregation in polycry...

Josephson properties of Nb/Cu multilayers.

Thermal stability and grain growth behavior of mechanicallly alloyed nanocrystalline Fe-Cu alloys

X-ray diffraction, transmission electron microscopy, and differential scanning calorimetry were used to study the thermal stability of highly supersaturated nanocrystalline Fe,Cul,-, alloys (10~~~95) synthesized by mechanical alloying. Alloys with x < 60 exhibit single-phase fee structure while single-phase bee alloys form for x > 80. For 6O<x<80 fee and bee phases coexist. Heating to elevated ...