Transmission Electron Microscopy Study of the Infrared Brazed High-strength Titanium Alloy

Wu, Zhaoxiang; Shiue, Ren-Kae; Chang, Chin‐Sung

doi:10.1016/s1005-0302(10)60051-5

Cited by 12 publications

(5 citation statements)

References 5 publications

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“…Based on the EDS elemental compositions, the proposed phase at points 1 and 3 was α-Zr with different contents of Ti, while the small inclusion of Cu and Ni at point 2 can be explained by the partial formation of a γ-phase by a eutectoid reaction, i.e., β-Zr→α-Zr + γ (γ: Zr-base intermetallic phases such as Zr 2 Cu and Zr 2 Ni) by taking into consideration their limited solubility in α-Zr. Similar α + γ two-phase structures in the brazed joints were reported in previous studies [11,14,16,18,19,22]. Points 4 and 6 in Figure 3b correspond to the segregation zone in Figure 1a and this zone contained considerable amounts of Cu and Ni.…”

Section: Microstructure and Hardness Of The Jointssupporting

confidence: 86%

Microstructural and Corrosion Properties of Ti-to-Zr Dissimilar Alloy Joints Brazed with a Zr-Ti-Cu-Ni Amorphous Filler Alloy

Lee

Baek

et al. 2021

Metals

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Titanium and Zircaloy-4 dissimilar alloys were brazed with a zirconium-titanium-copper-nickel amorphous filler alloy, and the resulting joint structures as well as their corrosion properties were examined. The microstructure of the brazed joints was investigated according to brazing holding time at 850 °C, and the corrosion property was analyzed by potentiodynamic polarization. During brazing, joints were produced by diffusion-induced isothermal solidification of the molten filler alloy. At a relatively brief brazing holding time of 5 min, a large segregation zone consisting of an active α-phase and a nobler intermetallic phase was generated in the joint center, which suffered from micro-galvanic corrosion. The presence of alloyed titanium deteriorated the nobility of the α-zirconium phase near the joint and induced galvanic coupling with cathodic base metals, resulting in massive localized corrosion. This localized corrosion caused the pitting behavior at the applied potential of −51.1~187.5 mV during anodic polarization. With a brazing holding time of 20 min, the concentration of the alloying elements was homogenized to eliminate the electrochemical potential difference and minimize the galvanic corrosion susceptibility of the joint region. This homogeneous joint resulted in a highly passive corrosion behavior comparable to that of the titanium base metal.

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Section: Microstructure and Hardness Of The Jointssupporting

confidence: 86%

Microstructural and Corrosion Properties of Ti-to-Zr Dissimilar Alloy Joints Brazed with a Zr-Ti-Cu-Ni Amorphous Filler Alloy

Lee

Baek

et al. 2021

Metals

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“…It has been reported that that Ti 2 Cu dissolves Ni up to 15 at%, and it is in accordance with the experimental observation. 10,17,18) It is obvious that the microstructure shown Fig. 1(c) and Zr driven by concentration gradient from the braze melt into Ti-15-3 substrate during brazing.…”

Section: Methodsmentioning

confidence: 99%

“…The presence of (Ti,Zr)2Ni intermetallic compound in Ti-20Zr-20Cu-20Ni brazed joint is very different from those in Ti15Cu-15Ni and Ti-25Cu-15Ni brazed ones. 10,18) Brazed joints using Ti-Cu-Ni filler metals were mainly comprised of Ti 2 Cu/Ti 2 Ni intermetallic compounds, acicular α-Ti and retained β-Ti. 10) In contrast, (Ti,Zr)2Ni intermetallic compound is the major phase in Ti-20Zr-20Cu-20Ni brazed joint, and (Ti,Zr) 2 Ni is in contact with the β-Ti substrate as displayed in Fig.…”

Section: Methodsmentioning

confidence: 99%

Microstructural Observation of Brazed Ti-15-3 Alloy Using the Clad Ti–20Zr–20Cu–20Ni Foil

2013

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“…Chang [11] and others studied contributions of a soft intermediate layer of Cu when Si 3 N 4 ceramics/316 stainless steel was connected to improve residual stress distribution. Cao Jian [12] successfully realized the brazing connection of SiC/Cu/304 stainless-steel using the conventional Ag-Cu-Ti solder, which mainly discussed the effect of the stress buffer layer Cu on the microstructure and bending strength of the joint [13,14]. Takahiro [15] and others used a Fe-based filler and realized the ceramic and stainless-steel vacuum brazing connection at 1323 K temperature.…”

Section: Introductionmentioning

confidence: 99%

Interfacial Microstructure and Properties of Si3N4 Ceramics/Cu/304 Stainless Steel Brazed by Ti40Zr25B0.2Cu Amorphous Solder

Wang

Zou

et al. 2018

Materials

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Si3N4 ceramics and 304 stainless steel were brazed by Ti40Zr25B0.2Cu amorphous solder, and the interfacial microstructure of brazed joint Si3N4 ceramics/Ti40Zr25B0.2Cu/Cu/Ti40Zr25B0.2Cu/304 stainless steel was analyzed. The mechanical properties of the brazed joint were overtly affected by the brazing temperature and Cu foil thickness. The results revealed that the interface structure of the brazed joint might be 304 stainless steel/FeTi/Cu-Zr+Cu-Ti+Fe-Ti/Cu(s,s)/Cu-Zr+Cu-Ti+Fe-Ti/Ti-Si+Zr-Si/TiN/Si3N4 ceramics. The four-point bending strength of the brazed joint decreased sharply as the brazing temperature increased and reached a maximum of 76 MPa at 1223 K. Furthermore, as the Cu foil thickness was increased from 500 μm to 1000 μm, the joint strength rose to 90 MPa at 1223 K.

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Transmission Electron Microscopy Study of the Infrared Brazed High-strength Titanium Alloy

Cited by 12 publications

References 5 publications

Microstructural and Corrosion Properties of Ti-to-Zr Dissimilar Alloy Joints Brazed with a Zr-Ti-Cu-Ni Amorphous Filler Alloy

Microstructural and Corrosion Properties of Ti-to-Zr Dissimilar Alloy Joints Brazed with a Zr-Ti-Cu-Ni Amorphous Filler Alloy

Microstructural Observation of Brazed Ti-15-3 Alloy Using the Clad Ti–20Zr–20Cu–20Ni Foil

Interfacial Microstructure and Properties of Si3N4 Ceramics/Cu/304 Stainless Steel Brazed by Ti40Zr25B0.2Cu Amorphous Solder

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