The mechanodynamic penetration of He atoms into porous Cu which was compressively strained at 4.2K was studied. Porous Cu was obtained by vaporizing Zn out of brass in vacuum at 800C for 8h. The number of He atoms which penetrated into the sample increased monotonically with strain to reach 2.9 x 1016/cm2 at ε = 42%. This amount of He was 2 or more orders of magnitude larger than that obtained from previous data on the mechanodynamic penetration of atoms of an external medium into crystalline and amorphous materials under strain. The relationships obtained suggested that specific types of He traps governed the kinetics of mechanodynamic diffusion of He into solids.

Mechanodynamic Diffusion of Helium Atoms into Porous Copper. O.V.Klyavin, V.I.Nikolaev, B.I.Smirnov, S.V.Khabarin, Y.M.Chernov, V.V.Shpeĭzman: Physics of the Solid State, 2008, 50[5], 828-31

Table 2

Grain-Boundary Diffusion of Ni in Cu