Deformation twinning activity and twin structure development of pure titanium at cryogenic temperature

Choi, Sunwoong; Won, Jong Woo; Lee, Sang‐Won; Hong, Jae‐Keun; Choi, Yoon Suk

doi:10.1016/j.msea.2018.09.091

Cited by 60 publications

(9 citation statements)

References 29 publications

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“…Thus, the mechanical properties do not follow the Hall–Petch relationship in this study. There are some reports that the cryogenic deformation of CP Ti will lead to nanotwins, [ 44 ] although no twins are visible in Figure 5 due to the small grain size.…”

Section: Discussionmentioning

confidence: 99%

“…Aluminum alloys [ 23–25 ] and copper alloys [ 26–28 ] showed high strength and high ductility after cryorolling and the ductility of UFG CP Ti from cryogenic deformation at 77 K was higher than the value obtained at RT. [ 29,30 ] Cryorolling was also used to produce UFG Ti and alloys [ 31–37 ] and there is a report that both strength and the fatigue limit were increased after cryorolling compared with Ti processed by ECAP when all other processing parameters were similar. [ 32 ]…”

Section: Introductionmentioning

confidence: 99%

“…[ 34 ] It was also reported that a cryorolled Ti alloy had nanosized grains with a grain size of the order of ≈60 nm with edge dislocations and nanotwins lying within the grains. [ 35 ] There is a report that twinning activity in CP Ti was significantly higher when rolling at 77 K compared with 293 K. [ 36 ] Although there is a report of compression twins and extension twins in CP Ti during cryorolling, [ 37 ] it appears that there have been no detailed investigations of the mechanical response of UFG Ti after fabrication by cryorolling and subsequent annealing. However, there are no reports on the analysis of the mechanical properties and thermal stability of cryorolled Ti sheets during annealing compared with those of RT‐rolled Ti sheets.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Microstructural Evolution and Mechanical Properties of Ultrafine‐Grained Ti Fabricated by Cryorolling and Subsequent Annealing

Wang

Yan

et al. 2020

Adv Eng Mater

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showed that the strength and microhardness of UFG Ti follow the conventional Hall-Petch relationship. [10] Several severe plastic deformation (SPD) techniques have been used to fabricate UFG samples, including Ti, such as highpressure torsion (HPT), [11-13] multidirectional forging, [14] friction stir welding, [15] equal-channel angular pressing (ECAP), [5,16,17] and special rolling technology. [18,19] It was reported that the strength of UFG Ti processed by HPT reached %1200 MPa [11] and there was a strength of %930 MPa in UFG Ti fabricated by multiforging and subsequent rolling. [14] There is a report that the mechanical properties and corrosion resistance of CP Ti after continuous ECAP plus short-duration annealing was comparable with the as-received sheets [20] and UFG Ti prepared by ECAP þ rolling had a higher strength than Ti-6Al-4V alloys. [21] Recently, a shear drawing technique was developed to fabricate UFG Ti bars and the results showed that the strength was improved to %590 MPa compared with %470 MPa in conventional drawing. [22] Deformation at cryogenic temperature may further refine the grain size compared with deformation at room temperature (RT). Aluminum alloys [23-25] and copper alloys [26-28] showed high

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microstructural Evolution and Mechanical Properties of Ultrafine‐Grained Ti Fabricated by Cryorolling and Subsequent Annealing

Wang

Yan

et al. 2020

Adv Eng Mater

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“…Most of metallic materials exhibit a ductile-to-brittle transition at low temperature, whilst several Ti alloys with a low impurity show better structural material properties (e.g., fatigue and toughness) 3 – 5 , and surprisingly higher ductility at cryogenic temperature 4 , 6 , 7 . This signifies a potential of improving the formability of Ti through cryogenic processing techniques (e.g., cryo-rolling and -forging) 8 – 11 . Due to the promising low-temperature properties, much attentions have been paid to its cryogenic applications such as liquid rocket engine, cryogenic fuel storage tank and transportation of liquid gas from offshore 2 , 5 , 12 .…”

Section: Introductionmentioning

confidence: 98%

In-situ neutron diffraction study of lattice deformation behaviour of commercially pure titanium at cryogenic temperature

Lee

Kawasaki

Yamashita

et al. 2022

Sci Rep

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Titanium has a significant potential for the cryogenic industrial fields such as aerospace and liquefied gas storage and transportation due to its excellent low temperature properties. To develop and advance the technologies in cryogenic industries, it is required to fully understand the underlying deformation mechanisms of Ti under the extreme cryogenic environment. Here, we report a study of the lattice behaviour in grain families of Grade 2 CP-Ti during in-situ neutron diffraction test in tension at temperatures of 15–298 K. Combined with the neutron diffraction intensity analysis, EBSD measurements revealed that the twinning activity was more active at lower temperature, and the behaviour was complicated with decreasing temperature. The deviation of linearity in the lattice strains was caused by the load-redistribution between plastically soft and hard grain families, resulting in the three-stage hardening behaviour. The lattice strain behaviour further deviated from linearity with decreasing temperature, leading to the transition of plastically soft-to-hard or hard-to-soft characteristic of particular grain families at cryogenic temperature. The improvement of ductility can be attributed to the increased twinning activity and a significant change of lattice deformation behaviour at cryogenic temperature.

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“…Twinning occurred from primary (about 3%) to secondary twinning (about 20%) depending on local plas c strains. Because a number of slip system are limited in hexagonal close packed (HCP) metal, twinning has been considered as an essen al deforma on process [6,7].…”

Section: Introduc Onmentioning

confidence: 99%

Effects of strain rate on tensile deformation behaviour in Ti-6Al-4V at cryogenic temperature

Lee

Hyun

et al. 2020

MATEC Web Conf.

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In this study, we investigated the effects of strain rate on tensile deformation behaviour in Ti-6Al-4V sheet at cryogenic temperature. X-ray diffraction (XRD) was used to identify the crystallographic orientation of rolled Ti-6Al-4V. A series of tensile tests were performed by constant strain rate method (CRS) with variable strain rates (i.e., on the order of 1x10-2 to 10-4•s-1). Liquid nitrogen (LN2) was used to mimic cryogenic environment, and for the thermal equilibrium the specimens were immersed in the vessel containing liquid nitrogen for ~10 minutes before tensile testing, and the temperature condition was continuously maintained during the testing. Microstructure and fracture surface was analysed by polarised light microscopy and scanning electron microscope (SEM). Electron backscatter diffraction (EBSD) was further used to characterise local deformation behaviour. Deformation twinning is occurred at cryogenic tempearture, which is rather different to the deformation at room temperature. It is thought that the twinning induced deformation behaviour may lead to a strength enhancement and a rate dependent ductility improvement. Key words: Ti-6Al-4V, cryogenic, microstructure, deformation twinning, EBSD

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Deformation twinning activity and twin structure development of pure titanium at cryogenic temperature

Cited by 60 publications

References 29 publications

Microstructural Evolution and Mechanical Properties of Ultrafine‐Grained Ti Fabricated by Cryorolling and Subsequent Annealing

Microstructural Evolution and Mechanical Properties of Ultrafine‐Grained Ti Fabricated by Cryorolling and Subsequent Annealing

In-situ neutron diffraction study of lattice deformation behaviour of commercially pure titanium at cryogenic temperature

Effects of strain rate on tensile deformation behaviour in Ti-6Al-4V at cryogenic temperature

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