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Phase transformation accommodated plasticity in nanocrystalline nickel
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View: Figures


Image of FIG. 1.
FIG. 1.

XRD results of as-received nc nickel and those rolled to various equivalent strains. Notice bcc peaks start to appear when the strain is around 0.32. The strength of the bcc peaks increases with equivalent strain, implying increased volume fraction of the bcc phase.

Image of FIG. 2.
FIG. 2.

(a) HRTEM image of a nc bcc grain next to the fcc matrix. (b) Enlarged view of the interface region between the fcc and bcc structures. In (b), the atomic arrangements of the [101] zone of fcc and the [111] zone of bcc near the phase boundary are shown, with the {111} -spacing of the fcc phase and the {110} -spacing of the bcc phase marked out, respectively. (c) Schematic configurations of the projected atomic arrays viewed in [101] of fcc and [111] of bcc.

Image of FIG. 3.
FIG. 3.

HRTEM image showing coexistence of the fcc (diamond) and bcc (square) phases in a nc nickel after room-temperature rolling, and the transitional structures indicated by an asterisk between the original fcc structure and the final bcc structure.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Phase transformation accommodated plasticity in nanocrystalline nickel