Acta Metallurgica Sinica (English Letters) ›› 2019, Vol. 32 ›› Issue (9): 1142-1150.DOI: 10.1007/s40195-019-00906-2

Special Issue: 2019年复合材料专辑

• Orginal Article • Previous Articles     Next Articles

Solid-State Diffusion Bonding of NbSS/Nb5Si3 Composite Using Ni/Al and Ti/Al Nanolayers

Xin-Yu Ren1, Hai-Shui Ren1, Yong-Wang Kang2, Hua-Ping Xiong1(), Chong Pei1, Bo Chen1, Yao-Yong Cheng1, A. I. Ustinov3   

  1. 1.Welding and Plastic Forming Division,Beijing Institute of Aeronautical Materials,Beijing 100095,China
    2.Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials,Beijing 100095,China
    3.E.O. Paton Electric Welding Institute of NAS of Ukraine,Kiev 03680,Ukraine
  • Received:2018-10-17 Revised:2019-03-20 Online:2019-09-10 Published:2019-08-06

Abstract:

Diffusion bonding of refractory Nb-Si-based alloy was performed with Ni/Al and Ti/Al nanolayers under the condition of 1473 K/30 MPa/60 min. The NbSS/Nb5Si3 in situ composite with the nominal composition of Nb-22Ti-16Si-3Cr-3Al-2Hf was used as the parent material. The joint microstructures were examined by using a scanning electron microscope eqsuipped with an X-ray energy dispersive spectrometer. Shear test was conducted for the bonded joints at room temperature. Within the joint bonded with Ni/Al multilayer, element diffusion occurred between the base metal and the nanolayer, with the reaction products of AlNb2?+?Ni3Al, NiAl and AlNi2Ti phases. The average shear strength was 182 MPa. While using Ti/Al multilayer, the interface mainly consisted of TiAl, (Ti,Nb)Al and (Ti,Nb)2Al phases, and the corresponding joints exhibited an increased strength of 228 MPa. In this case, the fracture mainly took place in the TiAl phase and presented a typical brittle characteristic.

Key words: NbSS/Nb5Si3 composite, Diffusion bonding, Nanolayer, Shear strength