Phase Equilibria in the Cu–Ti–Zr System at 750°C. II. The Isothermal Section with Copper Content from 50 to 100 at.%

Storchak-Fedyuk, A. M.; Artyukh, L. V.; Grytsiv, A.; Agraval, P. G.; Турчанин, М. А.; Velikanova, Т. Ya.

doi:10.1007/s11106-017-9889-1

Cited by 5 publications

(1 citation statement)

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“…Moreover, Zr was detected in all Ti-Cu intermetallic phases of the Ti6242-Ag28Cu joint. It has previously been shown that TiCu can incorporate Zr [21,22], while there exists a continuous solid solution (Ti,Zr)2Cu intermetallic also designated γ-phase [22]. Nevertheless, the highest amount of…”

Section: Brazing Reaction Productsmentioning

confidence: 99%

Interfacial Reactions and Fracture Behavior of Ti Alloy-Ag28Cu Brazing Joints: Influence of Titanium Alloy Composition

Gussone

Kasperovich

Haubrich

et al. 2018

Metals

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Brazing of titanium provides a joining technique suitable for the fabrication of highly-loaded aerospace components, but it still poses numerous challenges, such as the formation of brittle intermetallic interphases. This study of the interphase formation in brazed joints consisting of different titanium alloys (Ti-CP2, Ti-CP4, Ti-6Al-4V, Ti-6Al-2Mo-4Zr-2Sn) and Ag28Cu shows that complex reactions lead to the formation of various intermetallic phases including a Ti2Cu-TiCu boundary zone. The compositions of the titanium alloys influenced the particular microstructures, which have been characterized with various methods including synchrotron X-ray microtomography. Tensile tests evidence high ultimate tensile strengths that are, importantly, not directly limited by the strength of the brazing alloy. The strength of the Ti2Cu-TiCu phase boundary is significantly increased by the alloying elements in Ti-6Al-4V and Ti-6Al-2Mo-4Zr-2Sn and the crack paths change from boundary failure to transcrystalline fracture through TiCu as well as Ag-rich regions. Cu diffusion into the titanium substrate, leading to a coarse grained β-phase that transforms eutectoidally into a lamellar α-Ti + Ti2Cu structure during cooling, occurred in all systems except Ti-6Al-2Mo-4Zr-2Sn where Mo stabilized a fine grained microstructure and enabled the formation of a columnar TiCu structure.

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Section: Brazing Reaction Productsmentioning

confidence: 99%