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Open AccessArticle

Phase Transformation of a Ti-15Mo-5Zr-3Al Brazed Joint Using Clad Ti-15Cu-15Ni Filler

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Doctoral Degree Program in Ocean Engineering Technology, National Taiwan Ocean University, Keelung 20224, Taiwan
2
Engineering Training Center, Jiangsu Ocean University, Lianyungang, Jiangsu 222005, China
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Division of Nuclear Fuels and Materials, Institute of Nuclear Energy Research, Taoyuan 32546, Taiwan
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Department of Materials Science and Engineering, National Taiwan University, Taipei 10617, Taiwan
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Department of Optoelectronics and Materials Technology, National Taiwan Ocean University, Keelung 20224, Taiwan
*
Author to whom correspondence should be addressed.
Metals 2020, 10(1), 83; https://doi.org/10.3390/met10010083
Received: 23 November 2019 / Revised: 27 December 2019 / Accepted: 2 January 2020 / Published: 3 January 2020
Furnace brazing of Ti-15Mo-5Zr-3Al (Ti-15-5-3, β-Ti) alloy using clad Ti-15Cu-15Ni foil as the filler in a high vacuum has been carried out. In the brazed joints, the chemical compositions of distinct phases were quantified by electron probe micro-analyzer (EPMA), and the phase structures were identified by electron backscatter diffraction (EBSD). The as-brazed joint composed of α-Ti, retained β-Ti, Ti2Ni, and Ti2Cu. The embrittlement of the brazed joint was correlated mainly with the formation of intermetallics, especially cellular Ti2Ni dendrites in the brazed zone. It was noticed that the molten filler liquated the β-Ti grain boundaries and assisted the eutectic reaction therein, resulting in forming grain boundary Ti2Ni surrounded by the retained β-Ti. The results indicated that proper brazing conditions were able to eliminate all the harmful phases effectively, and increased the shear strength of the Ti-15Mo-5Zr-3Al brazed joint. View Full-Text
Keywords: brazing; titanium alloy; phase transformation; microstructure brazing; titanium alloy; phase transformation; microstructure
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MDPI and ACS Style

Yue, G.-L.; Chen, T.-C.; Shiue, R.-K.; Tsay, L.-W. Phase Transformation of a Ti-15Mo-5Zr-3Al Brazed Joint Using Clad Ti-15Cu-15Ni Filler. Metals 2020, 10, 83.

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