Microstructural Evolution of Infrared Brazed CP-Ti Using Ti-Cu-Ni Brazes

J Mater Sci Technol ›› 2011, Vol. 27 ›› Issue (2): 131-138.

• Novel Processing and Characterization Methods • Previous Articles Next Articles

Microstructural Evolution of Infrared Brazed CP-Ti Using Ti-Cu-Ni Brazes

C.T. Chang¹⁾, T.Y. Yeh²⁾, R.K. Shiue²⁾, C.S. Chang³⁾

1) Department of Mechanical Engineering, National Hualien Industrial Vocational Senior High School, Hualien 970, Taiwan, China
2) Department of Materials Science and Engineering, National Taiwan University, Taipei 106, Taiwan, China
3) Engineered Materials Solutions, 39 Perry Avenue, MS 4-1, Attleboro, MA 02703-2410, USA

Received:2008-09-03 Online:2011-02-28 Published:2011-02-28
Contact: R.K. Shiue

Abstract

Abstract: Microstructural evolution of infrared vacuum brazing CP-Ti using two Ti-based braze alloys, Ti-15Cu-15Ni and Ti-15Cu-25Ni, have been investigated. The infrared brazed joint consists of eutectic Ti2Cu/Ti2Ni intermetallic compounds and Ti-rich matrix. The eutectic Ti2Cu/Ti2Ni intermetallic compounds are disappeared from the joint after 1h annealed at 900oC. In contrast, the depletion rate of both Cu and Ni from the braze alloy into CP-Ti substrate at 750oC annealing is greatly decreased as compared with that annealed at 900oC. Blocky Ti2Cu/Ti2Ni phases are observed even if the specimen is annealed at 750oC for 15h. Because the Ni content of the Ti-15Cu-25Ni braze alloy is much higher than that of the Ti-15Cu-15Ni alloy, the amount of eutectic Ti2Cu/Ti2Ni phases in Ti-15Cu-25Ni brazed joint is more than that in Ti-15Ci-15Ni brazed joint. However, similar microstructural evolution can be obtained from the infrared brazed joint annealed at various temperatures and/or time periods for both filler metals.

Key words: Infrared Brazing, CP-Ti, Ti-Cu-Ni fillers, Microstructure

C.T. Chang, T.Y. Yeh, R.K. Shiue, C.S. Chang. Microstructural Evolution of Infrared Brazed CP-Ti Using Ti-Cu-Ni Brazes[J]. J Mater Sci Technol, 2011, 27(2): 131-138.

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Microstructural Evolution of Infrared Brazed CP-Ti Using Ti-Cu-Ni Brazes

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