Author/Authors :
Zhang، نويسنده , , J.Y. and Zhang، نويسنده , , P. and Zhang، نويسنده , , X. and Wang، نويسنده , , R.H. and Liu، نويسنده , , G. and Zhang، نويسنده , , G.J. and Sun، نويسنده , , J.، نويسنده ,
Abstract :
The phase transition of Nb from body-centered cubic (bcc) to face-centered cubic (fcc) has been found in Cu/Nb nanostructured multilayers with modulation period (λ) spanning from 5 to 300 nm, and was analyzed by using a thermodynamic model. As λ decreases, the strength of multilayers increase and approach saturation of ∼2.88 GPa at a few nm layer thickness. Size dependent strengthening in present fcc/fcc Cu/Nb multilayers is explained in terms of dislocation based strengthening mechanisms. The enhanced modulus of fcc/fcc Cu/Nb is also observed.
