Interfacial reaction and microstructure investigation of 4J36/Ni/Cu/V/TC4 diffusion-bonded joints

Gao, Qi; Jiang, Xiaosong; Sun, Hongliang; Song, Tingfeng; Mo, Defeng; Li, Xue

doi:10.1016/j.matlet.2021.130809

Cited by 6 publications

(3 citation statements)

References 13 publications

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“…In the (TiC + TiB+(TiZr)5Si3)/TA15 composite, after oxidation, the β-Ti phase forms the layers wetting the α/α GBs (Figure 19) [99]. GB wetting by the second solid phase was observed in a βsolidifying γ-TiAl alloy during β-α transformation [93], α-β phase transformation in a metastable TiZr based alloy [95], single-pass laser welding of 304 stainless steel and TC4 Ti alloy with V interlayer and Cu/V bilayer [97], in the TiAl2 and TiAl aluminum-rich intermetallics [100], Ti6Al4V/TiC composite coatings [102], in titanium aluminide materials manufactured by combustion and high-temperature shear deformation [103], in Ti-30.46 wt%Zr-0.73 wt%Hf-5.29 wt%Al-3.04 wt%V α + β alloy [104], in α + β Ti-4V-6Al titanium alloy [105], in Ti-80 at% W alloys [106], in 4J36/Ni/Cu/V/TC4 diffusion-bonded joints [107], the welded CP-Ti/304 stainless steel and CP-Ti/T2 bimetallic sheets [108], in the near-β Ti-5Mo-5Al-5V-1Fe-1Cr (Ti-55511) alloy [109], the hot isostatic pressed TA15 titanium alloy after solution and aging treatment [110]. By changing the Mo content in the Ti-44Al-(0-7)Mo (at%) alloys, the different variants of mutual complete and incomplete GB wetting by the α2, γ, and β o phases were observed (see Figure 20) [111].…”

Section: Influence Of Gb Wetting By the Second Solid Phase On The Pro...mentioning

confidence: 99%

Grain Boundary Wetting by the Second Solid Phase: 20 Years of History

Straumal

Lepkova

Korneva

et al. 2023

Metals

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Grain boundaries (GBs) can be wetted by a second phase. This phase can be not only liquid (or melted), but it can also be solid. GB wetting can be incomplete (partial) or complete. In the case of incomplete (partial) wetting, the liquid forms in the GB droplets, and the second solid phase forms a chain of (usually lenticular) precipitates. Droplets or precipitates have a non-zero contact angle with the GB. In the case of complete GB wetting, the second phase (liquid or solid) forms in the GB continuous layers between matrix grains. These GB layers completely separate the matrix crystallites from each other. GB wetting by a second solid phase has some important differences from GB wetting by the melt phase. In the latter case, the contact angle always decreases with increasing temperature. If the wetting phase is solid, the contact angle can also increase with increasing temperature. Moreover, the transition from partial to complete wetting can be followed by the opposite transition from complete to partial GB wetting. The GB triple junctions are completely wetted in the broader temperature interval than GBs. Since Phase 2 is also solid, it contains GBs as well. This means that not only can Phase 2 wet the GBs in Phase 1, but the opposite can also occur when Phase 1 can wet the GBs in Phase 2. GB wetting by the second solid phase was observed in the Al-, Mg-, Co-, Ni-, Fe-, Cu-, Zr-, and Ti-based alloys as well as in multicomponent alloys, including high-entropy ones. It can seriously influence various properties of materials.

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Section: Influence Of Gb Wetting By the Second Solid Phase On The Pro...mentioning

confidence: 99%

Grain Boundary Wetting by the Second Solid Phase: 20 Years of History

Straumal

Lepkova

Korneva

et al. 2023

Metals

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“…On the other aspect, there is no obstacle to the grain boundary migration due to the absence of γ in the BM, as shown in Figure 5a,b. On the third aspect, the application of Ni interlayer in the welding process promotes atom diffusion [12,52], which accelerates the grain boundaries mobility and grain coalescence. It can be deduced that the formation of abnormal grains in the bonding region is the result of integrating the above three effects, leading to the grain size increase largely from 20.06 µm on average to 60.12 µm.…”

Section: The Origin Of Abnormal Grain Growth and Its Correlation With...mentioning

confidence: 99%

Effect of Abnormal Grains on the Mechanical Properties of FGH96 Solid-State Diffusion Bonding Joint

et al. 2022

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The hollow twin-web disk is designed to improve the thrust-to-weight ratio of the aero engine, where the welding joint microstructures determine the disk’s mechanical properties. This study aimed to elucidate the effect of abnormal grains formed in the welding region on the mechanical properties of FGH96 solid-state diffusion bonding joints. Digital image correlation using images captured by scanning electron microscopy (SEM-DIC) and electron backscattering diffraction (EBSD) technologies were applied. The results show that abnormally large grains (2.5 times that of the matrix), with preferred orientation in the bonding region, were detrimental to the joint mechanical properties. The yield and tensile strengths were 995.85 MPa and 1456.67 MPa, respectively, and the corresponding relative (ratio to the matrix) ones were 92.54% and 88.81%. After modifying the bonding process, the grain size in the bonding region was tailored to close to that of the matrix, and considerable twin boundaries (TBs) formed, leading to the relative tensile and yield strength reaching 98.86% and 99.37%. Furthermore, the failure mode changed to intragranular type from intergranular type. It demonstrates that tailoring the newborn grain size, introducing TBs inside, and eliminating preferred orientation during the welding process can be an efficient way to improve the joint mechanical properties.

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“…Therefore, finding an ideal interlayer between titanium alloy and Cu that could inhibit the nucleation of Ti-Cu IMCs has become urgently required in the manufacturing of the IN625/TC4 BS. Gao et al [21] reported a 4J36/ TC4 BS with Ni/Cu/V multi-interlayers fabricated via the diffusion binding technology. While solid solutions, such as (Fe,Ni), (Cu,Ni), (V,Cu), and (Ti,V), were formed on the surfaces of the constituents, no IMCs were detected.…”

Section: Introductionmentioning

confidence: 99%

Laser melting deposition of Inconel625/Ti6Al4V bimetallic structure with Cu/V interlayers

Wang

Liu

et al. 2023

Mater. Res. Express

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A bimetallic structure (BS) made of Inconel625 (IN625) nickel-base superalloy with excellent high temperature properties and Ti6Al4V (TC4) titanium alloy with a light weight and a high strength has broad application prospects in aerospace engineering. However, the integrated manufacturing of the IN625/TC4 BS is a difficult research topic in the industry. In this work, the laser melting deposition (LMD) technology was used to prepare an IN625/TC4 BS without cracks and other metallurgical defects by adding Cu/V interlayers. The results show that the IN625/TC4 BS structure from the IN625 side to the TC4 one can be divided into four regions: IN625 region (region A) → Interlayers/IN625 transition region (region B) → TC4/Interlayers transition region (region C) → TC4 region (region D). The phase compositions of these regions are: γ-Ni + laves → (Ni, Cu)ss + (V, Cr)ss + TiNi → α-Ti + β-Ti + Ti2Ni → α-Ti + β-Ti. The Vickers hardness distribution is uneven in all regions, and the highest value (about 590.0 HV) is achieved in region B. The tensile strength of the IN625/TC4 BS with Cu/V interlayers reaches nearby 514.5±9.5 MPa at room temperature, and fractures are initiated in region B.

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Interfacial reaction and microstructure investigation of 4J36/Ni/Cu/V/TC4 diffusion-bonded joints

Cited by 6 publications

References 13 publications

Grain Boundary Wetting by the Second Solid Phase: 20 Years of History

Grain Boundary Wetting by the Second Solid Phase: 20 Years of History

Effect of Abnormal Grains on the Mechanical Properties of FGH96 Solid-State Diffusion Bonding Joint

Laser melting deposition of Inconel625/Ti6Al4V bimetallic structure with Cu/V interlayers

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