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Super-elastic titanium alloy with unstable plastic deformation
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View: Figures


Image of FIG. 1.
FIG. 1.

Elastic deformation behavior of Ti-24Nb-4Zr-7.9Sn alloy. (a) Stress-strain curves of cyclic deformation of As hot-rolled alloy. (b) Stress-strain curve of the As hot-rolled specimen held for six days without external stress after the cyclic deformation in (a) (solid curve), in comparison with the sixth cycle stress-strain curve in (a) (dashed curve), demonstrating the recovery of incipient Young’s modulus.

Image of FIG. 2.
FIG. 2.

TEM microstructure of cold-rolled sheet. (a) and (b) are a pair of bright-field and dark-field images showing grain size less than . Inset in (a) shows corresponding selected-area electron diffraction (SAD) pattern with continual diffraction rings.

Image of FIG. 3.
FIG. 3.

True stress-strain curves of uniaxial tensile test. Cold-rolled sheet (solid) shows an increase of flow stress by only over the hot-rolled starting alloy (dashed).

Image of FIG. 4.
FIG. 4.

X-ray diffraction analysis of the alloy. (a) As hot-rolled bar tensile strained to 3% and released; (b) tensile fracture surface of As hot-rolled sample; (c) compression sample immediately after 50% height reduction; (d) compressed sample in (c) after holding at ambient temperature in air for .

Image of FIG. 5.
FIG. 5.

Microstructure of a specimen after 50% compression. Bright-field TEM image shows narrow shear bands containing nanostructured grains after compression. Insets present SAD patterns from the areas noted by arrows.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Super-elastic titanium alloy with unstable plastic deformation