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- W2138208047 abstract "New diffusion brazing alloys for single crystalline component repair processes were developed and tested. Germanium was used as the melting point depressing element in these binary brazing alloys with germanium contents between 20 to 23 wt.%. Microstructural analysis has shown that the formation of a single crystalline joint was achieved after extended brazing cycles with these brazing alloys. No secondary phases other than the desired γ´ precipitates were detected within the brazing zone. This result was shown for two parent materials, PWA 1483 and Rene N5, a first and a second generation superalloy, respectively. The solidification mechanisms and kinetics were examined and show rather distinct deviations from Transient Liquid Phase Bonding theory for binary systems due to the multicomponent diffusion in the present system. Mechanical testing was performed at room temperature via nanoindentation and at elevated temperatures by hot tensile tests. The nanoindentation results show minor differences in hardness and elastic modulus between brazing joints and parent material. Ultimate tensile strengths of more than 90 % compared to the parent material were obtained in tensile testing at 980 °C." @default.
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- W2138208047 date "2008-01-01" @default.
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- W2138208047 title "New Boron and Silicon Free Single Crystal-Diffusion Brazing Alloys" @default.
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- W2138208047 doi "https://doi.org/10.7449/2008/superalloys_2008_211_220" @default.
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