Tensile Deformation of Ultrafine-Grained Fe-Mn-Al-Ni-C Alloy Studied by In Situ Synchrotron Radiation X-ray Diffraction

Gao, Si; Yoshimura, Takuma; Mao, Wenqi; Bai, Yu; Gong, Wu; Park, Myeong-heom; Shibata, Akinobu; Adachi, Hiroki; Sato, Masugu; Tsuji, Nobuhiro

doi:10.3390/cryst10121115

Cited by 20 publications

(3 citation statements)

References 52 publications

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“…The incident beam having a size of 0.5 mm and 0.3 mm in the horizontal and vertical directions was irradiated at the center of the gage part in the tensile specimen. Figure 10 schematically shows the in-situ XRD measurement system during the tensile test 66 . The incident X-ray beam was irradiated perpendicular to the tensile test specimen, and the profiles of X-ray diffraction were detected by onedimensional detector.…”

Section: Discussionmentioning

confidence: 99%

Unique transition of yielding mechanism and unexpected activation of deformation twinning in ultrafine grained Fe-31Mn-3Al-3Si alloy

Bai

Kitamura

Gao

et al. 2021

Sci Rep

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Tensile mechanical properties of fully recrystallized TWIP steel specimens having various grain sizes (d) ranging from 0.79 μm to 85.6 μm were investigated. It was confirmed that the UFG specimens having the mean grain sizes of 1.5 μm or smaller abnormally showed discontinuous yielding characterized by a clear yield-drop while the specimens having grain sizes larger than 2.4 μm showed normal continuous yielding. In-situ synchrotron radiation XRD showed dislocation density around yield-drop in the UFG specimen quickly increased. ECCI observations revealed the nucleation of deformation twins and stacking faults from grain boundaries in the UFG specimen around yielding. Although it had been conventionally reported that the grain refinement suppresses deformation twinning in FCC metals and alloys, the number density of deformation twins in the 0.79 μm grain-sized specimen was much higher than that in the specimens with grain sizes of 4.5 μm and 15.4 μm. The unusual change of yielding behavior from continuous to discontinuous manner by grain refinement could be understood on the basis of limited number of free dislocations in each ultrafine grain. The results indicated that the scarcity of free dislocations in the recrystallized UFG specimens changed the deformation and twinning mechanisms in the TWIP steel.

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Section: Discussionmentioning

confidence: 99%

Unique transition of yielding mechanism and unexpected activation of deformation twinning in ultrafine grained Fe-31Mn-3Al-3Si alloy

Bai

Kitamura

Gao

et al. 2021

Sci Rep

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“…The mechanical properties of the representative medium-Mn [38,[40][41][42]45,46,50,51,[53][54][55]84] and high-Mn [3,18,57,58,63,67,69,78,79,83,85,91,100,103,107,[109][110][111]113,116,122,124,127,129,[141][142][143][144][145][146][147][148][149][150][151][152][153][154][155][156]…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Austenite-Based Fe-Mn-Al-C Lightweight Steels: Research and Prospective

Ding

Liu

Cai

2022

Metals

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Fe-Mn-Al-C lightweight steels have been investigated intensely in the last a few years. There are basically four types of Fe-Mn-Al-C steels, ferritic, ferrite-based duplex/triplex (ferrite + austenite, ferrite + austenite + martensite), austenite-based duplex (ferrite + austenite), and single-austenitic. Among these steels, austenite-based lightweight steels generally exhibit high strength, good ductility, and outstanding weight reduction effects. Due to the addition of Al and high C content, κ’-carbide and κ-carbide are prone to form in the austenite grain interior and at grain boundaries of lightweight steels, respectively, and play critical roles in controlling the microstructures and mechanical properties of the steels. The microstructural evolution, strengthening mechanisms, and deformation behaviors of these lightweight steels are quite different from those of the mild conventional steels and TRIP/TWIP steels due to their high stacking fault energies. The relationship between the microstructures and mechanical properties has been widely investigated, and several deformation mechanisms have also been proposed for austenite-based lightweight steels. In this paper, the current research works are reviewed and the prospectives of the austenite-based Fe-Mn-Al-C lightweight steels are discussed.

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“…Recently, in-situ X-ray diffraction (XRD) measurements of dislocation density changes during tensile deformation have been performed using synchrotron radiation. [8][9][10][11] The authors' research group has investigated the behavior of dislocation density change in fine-grained pure aluminum with a grain size of up to several micrometers subjected to severe plastic deformation 8) and coarse-grained pure aluminum with a grain size of 10 µm or larger. 9) The dislocation density changes have been investigated by in-situ XRD measurements during tensile deformation using synchrotron radiation at SPring-8.…”

Section: Introductionmentioning

confidence: 99%

Effect of Precipitation Size on Dislocation Density Change during Tensile Deformation in Al–Zn–Mg Alloy

Hirata,

Iwata,

Okai

et al. 2023

Mater. Trans.

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Al-Zn-Mg alloys with different precipitate sizes were investigated to determine the influence of the precipitate size on the flow stress and dislocation density change during tensile deformation. The dislocation density was measured using in-situ X-ray diffraction at the SPring-8 synchrotron radiation facility with a time resolution of about 2 s. In region II with rapid dislocation multiplication, from under-aging to peak aging, the dislocation density increased with increasing aging time. Under over-aging conditions, the amount of dislocation multiplication in region II decreased with increasing aging time. Even in region III, the increase in dislocation density with plastic deformation was the largest for the peak aging conditions. However, the amount of work hardening was small and the contribution of dislocation hardening to the strength of the material was minimal. For over-aging conditions, the increase in dislocation density in region III was smaller than for the other regions, but the amount of work hardening was relatively large. It is considered that the influence of the dislocation density on work hardening is determined by the effectiveness of precipitates as obstacles to dislocation motion.

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Tensile Deformation of Ultrafine-Grained Fe-Mn-Al-Ni-C Alloy Studied by In Situ Synchrotron Radiation X-ray Diffraction

Cited by 20 publications

References 52 publications

Unique transition of yielding mechanism and unexpected activation of deformation twinning in ultrafine grained Fe-31Mn-3Al-3Si alloy

Unique transition of yielding mechanism and unexpected activation of deformation twinning in ultrafine grained Fe-31Mn-3Al-3Si alloy

Austenite-Based Fe-Mn-Al-C Lightweight Steels: Research and Prospective

Effect of Precipitation Size on Dislocation Density Change during Tensile Deformation in Al–Zn–Mg Alloy

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