Work softening and annealing hardening of deformed nanocrystalline nickel

Zhang, X. Y.; Liu, Q.; Wu, X. L.; Zhu, A. W.
December 2008
Applied Physics Letters;12/29/2008, Vol. 93 Issue 26, p261907
Academic Journal
We reported that work softening takes place during room-temperature rolling of nanocrystalline Ni at an equivalent strain of around 0.30. The work softening corresponds to a strain-induced phase transformation from a face-centered cubic (fcc) to a body-centered cubic (bcc) lattice. The hardness decreases with increasing volume fraction of the bcc phase. When the deformed samples are annealed at 423 K, a hardening of the samples takes place. This hardening by annealing can be attributed to a variety of factors including the recovery transformation from the bcc to the fcc phase, grain boundary relaxation, and retardation of dislocation gliding by microtwins.


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