Effects of Nb content in Ti–Ni–Nb brazing alloys on the microstructure and mechanical properties of Ti–22Al–25Nb alloy brazed joints

Wang, Y; Cai, Xiaoqiang; Yang, Zhenwen; Wang, D P; Liu, X G; Liu, Y C

doi:10.1016/j.jmst.2017.03.021

Cited by 34 publications

(8 citation statements)

References 33 publications

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“…The width of the bonding seam is about 55 μm. During the diffusion bonding process, Ti and Al strongly diffused into the base metal [37]. Meanwhile, Nb partly diffused into the interface due to the concentration gradient between the Ti/Al multilayer foils and the substrate.…”

Section: Joints Bonded With Ni/al Nanolayersmentioning

confidence: 99%

Solid-State Diffusion Bonding of NbSS/Nb5Si3 Composite Using Ni/Al and Ti/Al Nanolayers

Ren

Kang

et al. 2019

Acta Metall. Sin. (Engl. Lett.)

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Diffusion bonding of refractory Nb-Si-based alloy was performed with Ni/Al and Ti/Al nanolayers under the condition of 1473 K/30 MPa/60 min. The Nb SS /Nb 5 Si 3 in situ composite with the nominal composition of Nb-22Ti-16Si-3Cr-3Al-2Hf was used as the parent material. The joint microstructures were examined by using a scanning electron microscope equipped with an X-ray energy dispersive spectrometer. Shear test was conducted for the bonded joints at room temperature. Within the joint bonded with Ni/Al multilayer, element diffusion occurred between the base metal and the nanolayer, with the reaction products of AlNb 2 + Ni 3 Al, NiAl and AlNi 2 Ti phases. The average shear strength was 182 MPa. While using Ti/Al multilayer, the interface mainly consisted of TiAl, (Ti,Nb)Al and (Ti,Nb) 2 Al phases, and the corresponding joints exhibited an increased strength of 228 MPa. In this case, the fracture mainly took place in the TiAl phase and presented a typical brittle characteristic.

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Section: Joints Bonded With Ni/al Nanolayersmentioning

confidence: 99%

Solid-State Diffusion Bonding of NbSS/Nb5Si3 Composite Using Ni/Al and Ti/Al Nanolayers

Ren

Kang

et al. 2019

Acta Metall. Sin. (Engl. Lett.)

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“…Ti-based filler metals demonstrate high joint strengths close to their base metal in brazing titanium alloys among all types of brazing fillers [13][14][15][16]. In previous studies, clad Ti-(Zr)-Cu-Ni foils were successfully applied in the similar/dissimilar brazing of many Ti alloys, and the brazed joints showed good bonding strengths [17][18][19][20]. However, one of the major concerns in using such filler alloys is the formation of Cu/Ni/Ti intermetallic compounds in the joint.…”

Section: Introductionmentioning

confidence: 99%

“…Since Ni and Cu are important MPDs (melting point depressants) in these braze alloys, they simultaneously react with Ti in brazing [2]. The elimination of such brittle phase(s), if possible, becomes a crucial issue in application of such Ti-based filler metals [2,19,20].…”

Section: Introductionmentioning

confidence: 99%

Vacuum Brazing Ti–15–3 with a TiNiNb Braze Alloy

Kao

Tsay

Wang

et al. 2019

Metals

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Among all types of brazing fillers, Ti-based fillers show satisfactory joint strengths in brazing titanium alloys. However, the major concern in using such fillers is the formation of Cu/Ni/Ti intermetallic compound(s) in the joint. In this study, a Ti–15–3 alloy was vacuum brazed with a clad Ti–35Ni–25Nb foil. The brazed zone consisted of a Ti2Ni intermetallic compound in a (β-Ti,Nb)-rich matrix for specimen brazing at 1000 °C/600 s. Raising brazing temperature and time resulted in the Ti2Ni dissolving into the (β-Ti,Nb)-rich matrix. For the specimen brazing at 1100 °C/600s, Ti2Ni could only be observed at the grain boundaries of the (β-Ti,Nb)-rich matrix. After further raising it to 1200 °C/600 s, the Ti2Ni intermetallic compound was all dissolved into the (β-Ti,Nb)-rich phase. The average shear strength was significantly raised from 140 (1000 °C/600 s) to 620 MPa (1100 °C/3600 s). Crack initiation/propagation in the brittle Ti2Ni compound with the cleavage fractograph were changed into the Ti–15–3 base metal with a ductile dimple fractograph. The advantage of using Nb in the TiNiNb filler foil was its ability to stabilize β-Ti, and most of the Ni in the braze alloy was dissolved into the β-Ti matrix. The brazed joint could be free of any intermetallic phases with a proper brazing cycle applied, and the joint was suitable for a few harsh applications, e.g., repeated stresses and impact loadings.

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“…Among titanium aluminides, the orthorhombic Ti 2 AlNb-based alloys have higher ductility, higher yield strength, and better elevated temperature strength and fracture toughness [1][2][3]. Hence, considerable interest has been given to the Ti 2 AlNb-based alloys for various applications in aerospace components [4,5]. Over past decades, research in Ti 2 AlNb-based alloys was mainly focused on how to improve the mechanical properties of the alloys through alloying, thermo-mechanical processing and heat treatment etc.…”

Section: Introductionmentioning

confidence: 99%

“…Over past decades, research in Ti 2 AlNb-based alloys was mainly focused on how to improve the mechanical properties of the alloys through alloying, thermo-mechanical processing and heat treatment etc. [1][2][3][4][5][6][7]. At present, many aviation components which were made by Ti 2 AlNb-based alloys are fitted in a trial run engine [8].…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Tribological Behavior of the Ti-22Al-25Nb (at. %) Orthorhombic Alloy with Lamellar O Microstructures

Wang

Zhou

Wang

et al. 2018

Metals

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Tribological behavior of the isothermally forged and heat-treated Ti-22Al-25Nb (at. %) orthorhombic alloy with lamellar O microstructures was investigated. The friction experiments using a tribometer (UMT-3 CETR) against Si 3 N 4 and Al 2 O 3 were conducted at the load of 10N from 20 to 750 • C and a constant speed of 0.188 m/s. The experiment results indicated that for the friction pair of Al 2 O 3 , the coefficient of friction (COF) was decreased from 0.906-0.359, and for the friction pair of Si 3 N 4 , COF was decreased from 0.784-0.457 as the friction temperature increased from room temperature to 750 • C. The wear rate of the alloy against Al 2 O 3 is in the range of 2.63-8.15 × 10 −4 mm 3 N −1 m −1 , the wear rate against Si 3 N 4 is in the range of 2.44-5.83 × 10 −4 mm 3 N −1 m −1 , respectively. The wear mechanisms of the alloy were changed from plastic deformation and ploughing at lower temperature (20-400 • C) to adhesive wear and oxidative mechanism at higher temperature (600 and 750 • C). The friction and wear behavior of the Al 2 O 3 friction pair was comparable to that of the Si 3 N 4 friction pair.

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Effects of Nb content in Ti–Ni–Nb brazing alloys on the microstructure and mechanical properties of Ti–22Al–25Nb alloy brazed joints

Cited by 34 publications

References 33 publications

Solid-State Diffusion Bonding of NbSS/Nb5Si3 Composite Using Ni/Al and Ti/Al Nanolayers

Solid-State Diffusion Bonding of NbSS/Nb5Si3 Composite Using Ni/Al and Ti/Al Nanolayers

Vacuum Brazing Ti–15–3 with a TiNiNb Braze Alloy

High-Temperature Tribological Behavior of the Ti-22Al-25Nb (at. %) Orthorhombic Alloy with Lamellar O Microstructures

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