Microstructure evolution and brazing mechanism of Ti2AlC–Ti2AlC joint by using pure-silver filler metal

Wang, Guochao; Fan, Guohua; Zhang, Jie; Wang, Tianpeng; Liu, Xiaowen

doi:10.1016/j.ceramint.2015.03.040

Cited by 15 publications

(6 citation statements)

References 26 publications

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“…Figure shows the morphology of the Ag/Ti 2 AlC interaction area, which was investigated by field‐emission gun scanning electron microscopy (Sigma 500, Zeiss, Oberkochen, Germany), operating at 20 kV, coupled with EDS for chemical components analysis. The morphology of the interaction area was similar to that in the Ti 2 AlC/Ag/Ti 2 AlC joints, and the detailed characterization could be found in our previous work . It was worthwhile pointing out that a small amount of Al (about 7.8 at.%) and Ti (about 3.3 at.%) could be discovered in the Ag filler metal after the wetting experiment according to the EDS results.…”

Section: Methodssupporting

confidence: 81%

“…Considering that the TEM sample was prepared using the ion polishing method, these Ag nanoclusters were not likely to just adhere or be weakly bonded to the sample surface. In addition, our previous study revealed that the Ag nanoclusters could only be discovered in the Ti 2 AlC grains with specific orientations. The diameters of the Ag nanoclusters with different size were measured using the Gatan software, and then compared with the Ti 2 AlC substrate with corresponding atom layers.…”

Section: Resultsmentioning

confidence: 96%

“…The morphology of the interaction area was similar to that in the Ti 2 AlC/Ag/ Ti 2 AlC joints, and the detailed characterization could be found in our previous work. 19 It was worthwhile pointing out that a small amount of Al (about 7.8 at.%) and Ti (about 3.3 at.%) could be discovered in the Ag filler metal after the wetting experiment according to the EDS results. In addition, the light gray phase in the Ti 2 AlC substrate was confirmed to be TiAl x intermetallic compound.…”

Section: Methodsmentioning

confidence: 93%

“…Though the Ti 2 AlC ceramic was considered to be tolerant of Al vacancies, reaction and decomposition would still occur in various environment. In our previous research, we performed the brazing of Ti 2 AlC using Ag–Cu eutectic alloy and pure Ag filler metal. The results revealed that Cu was very reactive with the Ti 2 AlC substrate by forming the AlCu 2 Ti compound, and then resulted in further out‐migrating of Al atoms, which was suggested to be unfavorable for the stability of Ti 2 AlC substrate.…”

Section: Introductionmentioning

confidence: 99%

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Substitution behavior of Ag atoms in the Ti₂AlC ceramic

Wang

Yang

et al. 2016

J Am Ceram Soc.

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In this study, the substitution behavior of Ag atoms in the Ti2AlC ceramic was investigated using high‐angle annular dark field scanning transmission electron microscopy (HAADF‐STEM). The TEM sample of the Ag/Ti2AlC interaction area was prepared following the wetting experiment, which was carried out at 1030°C for 5 minute using the sessile drop method. The Ag “single atoms” or “nanoclusters” were found in the crystal lattice of Ti2AlC substrate. The characterizations along two typical crystallographic orientations suggest that both the Ti and Al atoms could be substituted by Ag atoms during the wetting process. In addition, the substitution behavior would contribute to the lattice expansion, which was coordinated by elastic distortion in the Ag nanoclusters with small size. However, when the Ag nanoclusters exceeded the critical size, the intact Ti2AlC structure could no more sustain and defects like stacking faults formed, based on which the Ag nanotwins or polycrystals nucleated.

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Section: Methodssupporting

confidence: 81%

Section: Resultsmentioning

confidence: 96%

Section: Methodsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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Substitution behavior of Ag atoms in the Ti₂AlC ceramic

Wang

Yang

et al. 2016

J Am Ceram Soc.

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“…Similarly, Yin et al [11] managed to join two samples of Ti It can be concluded from the above analysis that extremely high temperature is required to achieve the MAX phase diffusion couple by forming solid solutions, which is considered to be even higher than the decomposition temperature of the ceramic substrate under vacuum [12]. To decrease the processing temperature, as well as to overcome some disadvantages of the diffusion technique, we have performed a study of brazing Ti 2 AlC ceramics using a pure Ag filler metal [13]. The results suggested that the silver filler could diffuse into the Ti 2 AlC substrate along the grain boundary, and then formed an Ag 3 (Ti, Al) solid solution in the interaction area.…”

Section: Introductionmentioning

confidence: 99%

Brazing mechanisms of the Ti 2 AlC joints using a pure Al filler metal

Sun

Zhang

et al. 2017

Ceramics International

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Brazing of Ti 2 AlC ceramics has been successfully performed using a pure Al filler metal, in the temperature range 1023 K-1173 K and with holding time ranging from 0 min to 30 min. The microstructure of the Ti 2 AlC joints was studied, and the mechanical properties of the joints were evaluated by shear strength test. It is observed that the Al filler has weak effect on the stability of Ti 2 AlC substrate, and only a small amount of decomposition products including the TiC x and TiAl 3 compounds can be observed in the joints. In addition, the formation of an inter-diffusion layer in the Ti 2 AlC substrate is considered as the major brazing mechanism. The maximum shear strength of the Ti 2 AlC joints using the pure Al filler metal is 95 MPa, with an electrical conductivity of 2.21×10 6 S•m-1 , after holding the sample at 1123 K for 10 min.

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