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LI Li, ZHAO Wei, FENG Zhixue, LI Xiaoqiang, ZHOU Chang, WEI Hongyin. Brazability of a novel Ti-based filler alloy on the γ-TiAl alloy[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2021, 42(2): 30-37. DOI: 10.12073/j.hjxb.20201023004
Citation: LI Li, ZHAO Wei, FENG Zhixue, LI Xiaoqiang, ZHOU Chang, WEI Hongyin. Brazability of a novel Ti-based filler alloy on the γ-TiAl alloy[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2021, 42(2): 30-37. DOI: 10.12073/j.hjxb.20201023004
shu

Brazability of a novel Ti-based filler alloy on the γ-TiAl alloy

  • 1.

    East China Jiaotong University, Nanchang 330013, China

  • 2.

    National Engineering Research Center of Near-net-shape Forming for Metallic Materials, South China University of Technology, Guangzhou 510640, China

  • 3.

    China Railway Third Bureau Group Line Bridge Engineering Co., Ltd., Langfang 065200, China

  • 4.

    China Liuzhou Locomotive and Rolling Stock Co., Ltd., Liuzhou 545000, China

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  • Received Date: October 22, 2020
  • Available Online: April 15, 2021
    Graphical Abstract
    • Abstract
  • Ti-47Al-2Nb-2Cr-0.15B (at.%) alloy was successfully brazed at 1050 ~ 1125 ℃ for 10 min with amorphous Ti-Zr-Cu-Ni-Co-Mo filler. The microstructures of crystalline and amorphous fillers, the effects of brazing temperature (900 ~ 1125 ℃) and holding time (0 ~ 15 min) on the wettability and spreadability of the crystalline filler over the γ-TiAl alloy as well as the relationship between the microstructure and hardness of TiAl brazed joint at different brazing temperature were analyzed by SEM, EDS, XRD, TEM and Vickers hardness tester. Results showed that the increment of spreading area of the crystalline filler on γ-TiAl alloy increased firstly and then decreased with the increasing of temperature and holding time. The interfacial microstructure of γ-TiAl brazed joint mainly consisted of TiAl substrate layer, α2+AlCuTi (layer Ⅰ)and γ-(Ti, Zr)2(Ni, Cu)+α-(Ti, Zr) (layer Ⅱ). The hardness of the brazing seam increased with the brazing temperature and the maximum hardness of 872(±8) HV was obtained at 1125 ℃, which was mainly related to the hard and brittle (Ti, Zr)2(Ni, Cu) and α2-Ti3Al intermetallics generated in the brazing seam.
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    • References (33)
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