Plastic deformation mechanism of Ti–Nb–Ta–Zr–O alloy at cryogenic temperatures

Strength-Ductility Synergy in a Metastable β Titanium Alloy by Stress Induced Interfacial Twin Boundary ω Phase at Cryogenic Temperatures

“…The mechanical properties of EP0.0 [ 17 ], EP0.58, and EP0.85 [ 17 ] at 77 K, 200 K, and 293 K are summarized in Table 1 . At room temperature, EP0.85 has the best comprehensive mechanical properties (yield strength: 1020 MPa and elongation: 14%).…”

“…The values of Bo and Md of titanium alloys are directly determined by alloy compositions [ 26 , 27 ]. In recent years, some research studies have proven that temperature also has an effect on the stability of the β phase [ 15 , 17 , 28 ]. For the TNTZO alloy, the β phase became more unstable with the temperature decreasing, resulting in martensitic transformation and twinning becoming easier to occur while slip becoming more difficult.…”

“…Flat dog-bone-shaped specimens of a 9.5-mm gage length were used in tensile tests, which were carried out at a strain rate of 10 −4 s −1 and temperatures of 77, 200, and 273 K. At each temperature, three identical specimens were tested and every mechanical property value was averaged from these three independent tests. The following method was used to obtain the elongation to fracture, which has been used in our previous work [ 17 ]. Vickers micro-hardness indents spaced 1-mm apart were made along the specimen gage lengths before the tensile tests.…”

“…In recent years, the properties of β-titanium alloys at cryogenic temperatures has drawn some attention [ 13 , 14 , 15 , 16 , 17 ]. Liu et al reported that Ti-5Mo-5V-8Cr-3Al (TB2) had an ultra-high yield strength (1729 MPa) [ 13 ].…”

“…Our group has studied the plastic deformation behavior of gum metal with two different deformation histories at 77 and 200 K [ 17 ]. We found that both tensile strength and ductility of solution-treated gum metal have a significant enhancement at cryogenic temperatures.…”