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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.
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.
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).
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 .
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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