High-strength Zr-Nb-(Cu,Ni,Al) composites with enhanced plasticity

Das, J.; Löser, W.; Kühn, U.; Eckert, J.; Roy, S. K.; Schultz, L.
June 2003
Applied Physics Letters;6/30/2003, Vol. 82 Issue 26, p4690
Academic Journal
Zr[SUB73.5]Nb[SUB9]Cu[SUB7]Ni[SUB1]A[SUBl9.5] and Zr[SUB66.4]Nb[SUB6.4]Cu[SUB10.5]Ni[SUB8.7]A[SUBl8.0] composites of bcc b-Zr(Nb) dendrites embedded in a nanocrystalline matrix were prepared by slow cooling from melt. The increase of Nb content from 6.4 to 9 at. % slightly reduces the strength, but considerably improves the plastic elongation under uniaxial compressive loading from e[SUBp] = 0.6% to 14.8%. The interaction of strain with dendrites and the nanocrystalline matrix is suggested as origin of the improvement of the mechanical properties.


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