Impact of Equal Channel Angular Pressing on Mechanical Behavior and Corrosion Resistance of Hot-Rolled Ti-2Fe-0.1B Alloy

Wang, Yanhuai; Li, Xin; Alexandrov, Igor; Ma, Li; Dong, Yuecheng; Valiev, Ruslan Z.; Chang, Hui; Zhang, Biao; Wang, Yuyang; Zhou, Lian; Hu, Zhiwei

doi:10.3390/ma13225117

Cited by 9 publications

(7 citation statements)

References 33 publications

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“…Titanium alloy is an important strategic metal material with low density, high specific strength, and excellent corrosion resistance [ 1 , 2 , 3 ]. Such alloys, sometimes referred to as “air metal”, “marine metal”, or “smart metal”, are used in many applications in the aerospace, marine, chemical, and medical fields [ 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Design of Low-Cost and High-Strength Titanium Alloys Using Pseudo-Spinodal Mechanism through Diffusion Couple Technology and CALPHAD

Ding

Zhang

et al. 2021

Materials

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The high cost of development and raw materials have been obstacles to the widespread use of titanium alloys. In the present study, the high-throughput experimental method of diffusion couple combined with CALPHAD calculation was used to design and prepare the low-cost and high-strength Ti-Al-Cr system titanium alloy. The results showed that ultra-fine α phase was obtained in Ti-6Al-10.9Cr alloy designed through the pseudo-spinodal mechanism, and it has a high yield strength of 1437 ± 7 MPa. Furthermore, application of the 3D strength model of Ti-6Al-xCr alloy showed that the strength of the alloy depended on the volume fraction and thickness of the α phase. The large number of α/β interfaces produced by ultra-fine α phase greatly improved the strength of the alloy but limited its ductility. Thus, we have demonstrated that the pseudo-spinodal mechanism combined with high-throughput diffusion couple technology and CALPHAD was an efficient method to design low-cost and high-strength titanium alloys.

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Section: Introductionmentioning

confidence: 99%

Design of Low-Cost and High-Strength Titanium Alloys Using Pseudo-Spinodal Mechanism through Diffusion Couple Technology and CALPHAD

Ding

Zhang

et al. 2021

Materials

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“…Both Fe and B element additions can benefit the refinement of ingot structure; meanwhile, the reduction in grain size of Ti-2Fe-0.1B alloy by ECAP can effectively improve the segregation of elements and weaken the galvanic effect [34,35]. Our group [22] characterized the surface morphology of CG and UFG Ti-2Fe-0.1B after potentiodynamic scanning by SEM, and it was found that the corrosion pit volume produced by selective dissolution due to the galvanic effect in CG Ti-2Fe-0.1B was significantly higher than that in UFG Ti-2Fe-0.1B. This result proves that in UFG Ti-2Fe-0.1B, the distribution of alloying elements in the α and β phases is more uniform and the microstructure is more homogeneous, which could reduce the risk of pitting corrosion when the fresh substrate is exposed to corrosive medium because the passivation film ruptures under the influence of external tensile stress.…”

Section: Discussionmentioning

confidence: 94%

“…In contrast, the microstructure of UFG Ti-2Fe-0.1B alloy is mainly composed of dislocation cells and several subgrains; the microstructure is totally blurry due to a large number of dislocation tangles and dislocation piles; all the grains have high internal stress after suffering severe deformation; and the undistorted grains with clear grain boundaries and regular shapes are rarely seen. The microstructure of UFG Ti-2Fe-0.1B is more uniform, and the average grain size is 0.24 µm [22].…”

Section: Tem Microstructural Characterizationmentioning

confidence: 96%

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Stress Corrosion Cracking of Ultrafine-Grained Ti-2Fe-0.1B Alloying after Equal Channel Angular Pressing

Huang

Jin

Wang

et al. 2023

Metals

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In the present study, the stress corrosion cracking (SCC) of ultrafine-grained (UFG) Ti-2Fe-0.1B prepared by equal channel angular pressing (ECAP) was investigated by a slow strain rate test (SSRT) with in-site electrochemical equipment. In comparison with the atmosphere, results indicated that the mechanical properties of Ti-2Fe-0.1B alloy degraded in the simulated sea water, and the SCC sensitivity of UFG Ti-2Fe-0.1B alloy is much lower than the initial coarse-grained (CG) state. The enhanced SCC resistance of UFG Ti-2Fe-0.1B alloy could be attributed to the mechanical and corrosive aspects simultaneously. First of all, the strength of UFG Ti-2Fe-0.1B alloy is much higher than the CG state, but the elongation to failure of UFG Ti-2Fe-0.1B alloy decreased more than 1.8 times. The UFG sample suffered crack initiation until failure with a relative short time and low plastic deformation, which weakened the effect of corrosion during SSRT. In addition, X-ray photoelectron spectroscopy (XPS) revealed that the thickness of the passivation film of the UFG Ti-2Fe-0.1B alloy is thicker and that the component of the passivation film possesses a higher proportion of TiO2 in the same etched depth, which is beneficial to the corrosion resistance. Furthermore, according to the in-site electrochemical experiment curves, it is believed that the passivation film has a higher repair ability after cracking during SSRT for the UFG Ti-2Fe-0.1B alloy due to the decrease in grain size and the increase in dislocation density.

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“…Furthermore, B microalloying is famous for its use in titanium alloys to improve the ingot structure, which is of benefit for the consequential forging and rolling process [21]. Hence, a novel Ti-2Fe-0.1B titanium alloy was designed by our team, developed and additively manufactured using several advanced technologies, such as severe plastic deformation and a thermal hydrogenated process [22][23][24]. As we all know, the B element addition in titanium alloys could benefit their thermal stability because of the TiB needles present at the grain boundaries, which restrict their mobility at high temperatures due to the Zener drag mechanism.…”

Section: Introductionmentioning

confidence: 99%

Effect of Heat Treatment on Microstructure and Mechanical Behavior of Ultrafine-Grained Ti-2Fe-0.1B

Wang²,

Wang

et al. 2023

Materials

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In the present study, a novel Ti-2Fe-0.1B alloy was processed using equal channel angular pressing (ECAP) via route Bc for four passes. The isochronal annealing of the ultrafine-grained (UFG) Ti-2Fe-0.1B alloy was conducted at various temperatures between 150 and 750 °C with holding times of 60 min. The isothermal annealing was performed at 350–750 °C with different holding times (15 min–150 min). The results indicated that no obvious changes in the microhardness of the UFG Ti-2Fe-0.1B alloy are observed when the annealing temperature (AT) is up to 450 °C. Compared to the UFG state, it was found that excellent strength (~768 MPa) and ductility (~16%) matching can be achieved for the UFG Ti-2Fe-0.1B alloy when annealed at 450 °C. The microstructure of the UFG Ti-2Fe-0.1B alloy before and after the various annealing treatments was characterized using electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). It was found that the average grain size remained at an ultrafine level (0.91–1.03 μm) when the annealing temperature was below 450 °C. The good thermal stability of the UFG Ti-2Fe-0.1B alloy could be ascribed to the pinning of the TiB needles and the segregation of the Fe solute atoms at the grain boundaries, which is of benefit for decreasing grain boundary energy and inhibiting the mobility of grain boundaries. For the UFG Ti-2Fe-0.1B alloy, a recrystallization activation energy with an average value of ~259.44 KJ/mol was analyzed using a differential scanning calorimeter (DSC). This is much higher than the lattice self-diffusion activation energy of pure titanium.

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Impact of Equal Channel Angular Pressing on Mechanical Behavior and Corrosion Resistance of Hot-Rolled Ti-2Fe-0.1B Alloy

Cited by 9 publications

References 33 publications

Design of Low-Cost and High-Strength Titanium Alloys Using Pseudo-Spinodal Mechanism through Diffusion Couple Technology and CALPHAD

Design of Low-Cost and High-Strength Titanium Alloys Using Pseudo-Spinodal Mechanism through Diffusion Couple Technology and CALPHAD

Stress Corrosion Cracking of Ultrafine-Grained Ti-2Fe-0.1B Alloying after Equal Channel Angular Pressing

Effect of Heat Treatment on Microstructure and Mechanical Behavior of Ultrafine-Grained Ti-2Fe-0.1B

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