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Lattice softening for producing ultrahigh strength of iron base nanocrystalline alloy
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Plots of the ultimate tensile strength (UTS) vs Young’s modulus (E) for an Fe-19%Ni-34%Co-8%Ti (in at. %) alloy processed with high-pressure torsion (HPT) at 6 GPa for 10 turns, an ultrahigh-strength titanium alloy called Gum Metal, and other selected high-strength crystalline metallic alloys. The line for represents a rough estimation of ideal tensile strength of the crystalline materials. The line for represents an upper strength limit of crystalline metallic alloys. The plots for the present iron base alloy and Gum Metal are on the line for which well approaches the line for the ideal strength. (b) Schematic representation of lattice softening at the limit of phase stability, in which we referred to the data of elastic constants for Fe–Ni binary alloys (Ref. 18).

Image of FIG. 2.
FIG. 2.

(a) X-ray profiles of the Fe–Ni–Co–Ti alloy before and after SPD. (b) Transmission electron micrograph and selected area diffraction pattern of the Fe–Ni–Co–Ti alloy after SPD. (c) Bright-field image enlarged from Fig. 2(b). (d) Dark-field image enlarged from Fig. 2(b).

Image of FIG. 3.
FIG. 3.

(a) Stress-strain curves for the SPDed Fe–Ni–Co–Ti alloy and Gum Metal. (b) Scanning electron micrograph of the fractured surface of the SPDed Fe–Ni–Co–Ti alloy. (c) Plots of the UTS/E vs elongation for the Fe–Ni–Co–Ti alloy and the other high strength iron base alloys. The figure also contains the plots for SPDed pure copper and titanium with nanograins.


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Scitation: Lattice softening for producing ultrahigh strength of iron base nanocrystalline alloy