Fabricating Ti–22Al–25Nb intermetallic with ductility higher than 25% by advanced printing technique: Point-forging and laser-deposition

Zhang, Shengwei; Xi, Mingzhe; Li, Rui; Li, Mingyue; Guo, Xiaotian; Gui, Yiming; Wu, Jing

doi:10.1016/j.msea.2022.143520

Cited by 8 publications

(11 citation statements)

References 50 publications

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“…The HAGB of the curvature at larger deformation is bent toward the adjacent grains by the grain boundary-induced migration mechanism, so that the grain boundaries are bowed out from the low density to the high density and become stable interfaces after reaching a certain size, forming new small SRX grains. This fully exhibits the DSRX characteristics [ 36 ]. In addition, the dislocation relationship can further illustrate the DSRX mechanism, as shown in Figure 8 d, the dislocation relationship between the grains and G2 in the polar figure proves that the DSRX grains have a random orientation.…”

Section: Discussionmentioning

confidence: 99%

Strain Rate Dependence and Recrystallization Modeling for TC18 Alloy during Post-Deformation Annealing

Kong³

et al. 2023

Materials

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In this paper, the dependence of dynamic recrystallization (DRX) and post-dynamic recrystallization (PDRX) of TC18 alloy on strain rate within the range of 0.001 s−1~1 s−1 was investigated through isothermal compression and subsequent annealing in the single-phase region. Electron backscatter diffraction (EBSD) characterization was employed to quantify microstructure evolution and to reveal the recrystallization mechanism. At the thermo-deformation stage, the DRX fraction does not exceed 10% at different strain rates, due to the high stacking fault energy of the β phase. During the subsequent annealing process, the total recrystallization fraction increases from 10.5% to 79.6% with the strain rate increasing from 0.001 s−1 to 1 s−1. The variations in the geometrically necessary dislocation (GND) density before and after annealing exhibit a significant discrepancy with the increasing strain rate, indicating that the GND density is a key factor affecting the PDRX rate. The PDRX mechanisms, namely meta-dynamic recrystallization (MDRX), continuous static recrystallization (CSRX) and discontinuous static recrystallization (DSRX), were also revealed during the annealing process. A new kinetic model coupling DRX and PDRX was proposed to further describe the correlation between recrystallization and the strain rate during continuous deformation and annealing. This new model facilitates the prediction of recrystallization fraction during isothermal deformation and annealing of titanium alloys.

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Section: Discussionmentioning

confidence: 99%

Strain Rate Dependence and Recrystallization Modeling for TC18 Alloy during Post-Deformation Annealing

Kong³

et al. 2023

Materials

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“…The following types of powders can be used for the AM of Ti 2 AlNb-based alloys: Elemental powders of pure Ti, Al, Nb and other metals [ 12 , 45 , 46 , 47 , 48 , 49 ]; Elemental powders of pure Ti and pre-alloyed Al-Nb [ 50 ]; Pre-alloyed powders of a given composition [ 10 , 11 , 12 , 13 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 ]. …”

Section: Feedstock Materialsmentioning

confidence: 99%

“…Pre-alloyed powders of a given composition [ 10 , 11 , 12 , 13 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 ].…”

Section: Feedstock Materialsmentioning

confidence: 99%

“…Increased microhardness of O-phase alloys is associated with the precipitation of second phases (O, α 2 , TiC) in the B2/β matrix. This occurs as a result of cyclic thermal [ 10 , 14 , 67 , 90 ] or thermomechanical [ 54 ] effects during MAM as well as during pre-heating of the platform at 500 °C and higher [ 12 ], subsequent heat treatment [ 46 , 47 , 56 , 60 ] and addition of SiC [ 55 ]. Note that the refinement of the precipitation of the second phases results in higher hardness [ 12 , 47 ].…”

Section: The Influence Of Mam Process Parameters On Structure Phase C...mentioning

confidence: 99%

“…In [ 92 ], the microhardness and elastic modulus of individual phases (O, B2, α 2 ) were determined by nanoindentation and compared with the previous research [ 101 , 102 , 103 ]. The difference in the values of the microhardness in different studies can be associated with the different measurement conditions (load, holding time), in which different works vary within a wide range—from 0.3 N and 10 s [ 90 ] to 300 N and 30 s [ 54 ].…”

Section: The Influence Of Mam Process Parameters On Structure Phase C...mentioning

confidence: 99%

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A Review—Additive Manufacturing of Intermetallic Alloys Based on Orthorhombic Titanium Aluminide Ti2AlNb

et al. 2023

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Titanium alloys based on orthorhombic titanium aluminide Ti2AlNb are promising refractory materials for aircraft engine parts in the operating temperature range from 600–700 °C. Parts made of Ti2AlNb-based alloys by traditional technologies, such as casting and metal forming, have not yet found wide application due to the sensitivity of processability and mechanical properties in chemical composition and microstructure compared with commercial solid-solution-based titanium alloys. In the last three decades, metal additive manufacturing (MAM) has attracted the attention of scientists and engineers for the production of intermetallic alloys based on Ti2AlNb. This review summarizes the recent achievements in the production of O-phase-based Ti alloys using MAM, including the analysis of the feedstock materials, technological processes, machines, microstructure, phase composition and mechanical properties. Powder bed fusion (PBF) and direct energy deposition (DED) are the most widely employed MAM processes to produce O-phase alloys. MAM provides fully dense, fine-grained material with a superior combination of mechanical properties at room temperature. Further research on MAM for the production of critical parts made of Ti2AlNb-based alloys can be focused on a detailed study of the influence of post-processing and chemical composition on the formation of the structure and mechanical properties, including cyclic loading, fracture toughness, and creep resistance.

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Deformation Behavior and Microstructure Evolution of AZ31 Mg Alloy by Forging–Bending Repeated Deformation with Multi-pass Lowered Temperature

Wei

et al. 2023

Acta Metall. Sin. (Engl. Lett.)

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In this study, AZ31 Mg alloy was processed by a new severe plasticity deformation methodology with multi-pass lowered temperature, and the deformation behavior and microstructure evolution were investigated by finite element method and electron back-scattered diffraction technique and hardness. The results show that with the increase of deformation pass, the strain gradually springs, and its interval distribution tends to homogenize. Meanwhile, the effective strain increases dramatically with the shear force sudden upgrade in the deformation process. Moreover, the new deformation technique can refine grain size remarkably. With the passes on, {10-12} tensile twins behavior and the pyramidal < c + a > slip are triggered more frequently, leading to the completeness of dynamic recrystallization (DRX) gradually, which weaken and disperse the basal texture obviously. Besides, the standard deviation of hardness is getting smaller, and the maximum can reach 78.40 HV on average, which can be attributed to the even large strain distribution, complete DRX, and the high geometrically necessary dislocation.

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Fabricating Ti–22Al–25Nb intermetallic with ductility higher than 25% by advanced printing technique: Point-forging and laser-deposition

Cited by 8 publications

References 50 publications

Strain Rate Dependence and Recrystallization Modeling for TC18 Alloy during Post-Deformation Annealing

Strain Rate Dependence and Recrystallization Modeling for TC18 Alloy during Post-Deformation Annealing

A Review—Additive Manufacturing of Intermetallic Alloys Based on Orthorhombic Titanium Aluminide Ti2AlNb

Deformation Behavior and Microstructure Evolution of AZ31 Mg Alloy by Forging–Bending Repeated Deformation with Multi-pass Lowered Temperature

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