The structural design and superplastic forming/diffusion bonding of Ti2AlNb based alloy for four-layer structure

Du, Zhihao; Jiang, Shaosong; Zhang, Kaifeng; Zhang, Lu; Li, Baoyong; Zhang, Dalin

doi:10.1016/j.matdes.2016.05.046

Cited by 56 publications

(17 citation statements)

References 23 publications

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“…Wang et al 11 reported that Ti 2 AlNb samples had the best quality of diffusion bonding under 20.83 MPa when the temperature is 960 C and the holding time is 2 h. Zou et al 12 reported that a tight bonding interface of Ti 2 AlNb was formed under conditions of the bonding temperature higher than 970 C, bonding pressure higher than 7 MPa, and holding time longer than 30 min. Du et al 13 reported that the four-layer honeycomb structure of Ti 22 Al 27 Nb alloy was manufactured by SPF/DB process while the diffusion bonding parameter was 970 C/10 MPa/2 h. Zhu et al 14 studied the dissimilar diffusion bonding behavior of hydrogenated Ti 2 AlNb-based and Ti-6Al-4V alloys. Wang et al 15 reported that the shear strength of TiAl/ Ti 2 AlNb joint reached 258.9 MPa at 950 C for 40 min under a pressure of 5 MPa with the hydrogenated niobium (Nb) interlayer of 1.0 wt% hydrogen content.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and mechanical properties of Ti-Ti₂AlNb interface

Niu

Jiang

Zhang

et al. 2021

Composites and Advanced Materials

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Diffusion bonding of Ti2AlNb alloy using pure titanium (Ti) foil as an interlayer was carried out on superplastic forming and diffusion bonding special equipment by gas pressure loading method. The microstructure of Ti-Ti2AlNb interface was observed using scanning electron microscope and energy-dispersive spectrometer while the mechanical properties of the joints were evaluated by shear test. The results show that the thickness of Ti foil interlayer has a great influence on the microstructure and shear strength of the interface diffusion region. When the thickness of the intermediate layer is thin (25 µm), Ti, aluminum (Al), and niobium (Nb) elements are fully diffused with uniform element distribution through the diffusion region. The diffusion layer region presents uniform, fine, and disordered lamellar α-Ti + β-Ti dual-phase structure with high shear strength. When the thickness of Ti foil interlayer is thick (50 µm), the distribution of Al elements is relatively uniform through the diffusion region due to its smaller radius and faster diffusion speed, and Ti and Nb elements present gradient distribution from the middle to both sides. The diffusion layer region presents a coarse and long strip shape α-Ti + β-Ti dual-phase structure in the middle part and a fine needle-like or irregular α-Ti + β-Ti dual-phase structure in both side parts, with slightly lower shear strength. Temperature has a great influence on the microstructure and mechanical properties of the diffusion bonding joints. The diffusion region presents a black α-Ti strip area in the middle part with the width of about 10 µm at lower temperature (910°C) with poorer property, due to the grain growth of the parent metal, the property is slightly poorer when the temperature is too high (960°C), and the optimal temperature is 930°C with a higher shear strength.

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Section: Introductionmentioning

confidence: 99%

Microstructure and mechanical properties of Ti-Ti₂AlNb interface

Niu

Jiang

Zhang

et al. 2021

Composites and Advanced Materials

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“…The poor ductility at room temperature and loss of dimensional accuracy caused by springback drives engineers to manufacture titanium alloys, especially panel components, using hot forming techniques, such as superplastic forming (SPF) [2], hot gas forming [3], incremental forming [4] and isothermal hot forming [5]. SPF of titanium alloy is a robust technology, that has been extensively investigated and used for manufacturing extremely-complex components, normally integrated with diffusion bonding [6]. To compensate the drawbacks of low productivity, high manufacture cost and over-thinning, hot gas forming technique has been developed aiming to manufacture parts at higher strain rates and improving thickness uniformity for thin-walled components [7].…”

Section: Introductionmentioning

confidence: 99%

Deformation Behavior and Microstructural Evolution during Hot Stamping of TA15 Sheets: Experimentation and Modelling

Chen

et al. 2019

Materials

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Near-α titanium alloys have extensive applications in high temperature structural components of aircrafts. To manufacture complex-shaped titanium alloy panel parts with desired microstructure and good properties, an innovative low-cost hot stamping process for titanium alloy was studied in this paper. Firstly, a series of hot tensile tests and Scanning Electron Microscope (SEM) observations were performed to investigate hot deformation characteristics and identify typical microstructural evolutions. The optimal forming temperature range is determined to be from 750 °C to 900 °C for hot stamping of TA15. In addition, a unified mechanisms-based material model for TA15 titanium alloy based on the softening mechanisms of recrystallization and damage was established, which enables to precisely predict stress-strain behaviors and potentially to be implemented into Finite Element (FE) simulations for designing the reasonable processing window of structural parts for the aerospace industry.

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“…As an important technical method for material connection, the solid metal connection technology of metal sheets becomes a necessary step for materials to be converted into usable parts and structures, which can realize the direct connection of metal sheets [1]. At present, the mature solid-state connection technologies mainly include accumulative roll-bonding (ARB) [2], superplastic forming/diffusion bonding [3], mechanical bonding [4,5], and friction stir welding (FSW) [6,7]. Shear connection is one of the promising solid-state connection technologies because of its innovative technology, good process and low relative cost.…”

Section: Introductionmentioning

confidence: 99%

Hot Deformation Behavior of Q345 Steel and Its Application in Rapid Shear Connection

Zhang

et al. 2019

Materials

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The high-temperature deformation behavior of Q345 steel is detected by a Gleeble-3800 thermal simulator. The Arrhenius constitutive equation for high-temperature flow stress and the dynamic recrystallization model are constructed. With the secondary development technology, customized modifications are made on existing Deform-3D software. The constructed constitutive model and dynamic recrystallization model are embedded into Deform-3D to realize the secondary development of Deform-3D. The grain size and volume percentage distribution of dynamic recrystallization are obtained by simulating the shear connection process at high temperature and high speed. The results show that the constitutive equation and the dynamic recrystallization model constructed in this paper can be used to predict the evolution of the microstructure. The difference between the prediction results and the experimental data is about 3%. The accuracy of Arrhenius constitutive equation, dynamic recrystallization model and the feasibility of software secondary development are verified.

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The structural design and superplastic forming/diffusion bonding of Ti2AlNb based alloy for four-layer structure

Cited by 56 publications

References 23 publications

Microstructure and mechanical properties of Ti-Ti₂AlNb interface

Microstructure and mechanical properties of Ti-Ti₂AlNb interface

Deformation Behavior and Microstructural Evolution during Hot Stamping of TA15 Sheets: Experimentation and Modelling

Hot Deformation Behavior of Q345 Steel and Its Application in Rapid Shear Connection

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The structural design and superplastic forming/diffusion bonding of Ti2AlNb based alloy for four-layer structure

Cited by 56 publications

References 23 publications

Microstructure and mechanical properties of Ti-Ti2AlNb interface

Microstructure and mechanical properties of Ti-Ti2AlNb interface

Deformation Behavior and Microstructural Evolution during Hot Stamping of TA15 Sheets: Experimentation and Modelling

Hot Deformation Behavior of Q345 Steel and Its Application in Rapid Shear Connection

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Microstructure and mechanical properties of Ti-Ti₂AlNb interface

Microstructure and mechanical properties of Ti-Ti₂AlNb interface