Ultrastrong and ductile transient liquid phase (TLP) bonding joints reinforced by ordered multi-precipitates

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

2 Scopus Citations
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Author(s)

  • L. Yuan
  • J. T. Xiong
  • J. Ren
  • X. Xiao
  • Y. K. Ma
  • J. H. Luan
  • J. L. Li

Detail(s)

Original languageEnglish
Article number109568
Journal / PublicationComposites Part B: Engineering
Volume231
Issue numberPart B
Online published11 Dec 2021
Publication statusPublished - 15 Feb 2022

Abstract

Transient liquid phase (TLP) bonding of is one of the most important welding technique to be applied to manufacture core components of aero-engine turbines. Homogeneous microstructure in a TLP joint with no defects and brittle products has always been the goal we pursued. But actually, this is far from the requirements for a superior-performance, long-life and excellent-reliability turbine as the joints need to be serviced with comprehensive properties such as high strength and toughness, outstanding creep resistance and so on. In this work, an ultrastrong and ductile TLP joint of high entropy alloy (HEA) of FeCoNiTiAl and FGH98 superalloy has been achieved by controlling ordered multi-precipitates, L12-Ni3Al, TiB2 and M3B2 borides, produced in the welded zone. Formation and growth kinetics of the precipitates were characterized by atom probe tomography (APT), scanning electron microscope (SEM), transmission electron microscope (TEM) and electron backscatter diffraction (EBSD). Furthermore, a microstructure-based finite element model (FEM) combined with the TEM analysis were applied to study plastic deformation mechanisms of TLP joint with maximum shear stress of 1156 MPa and excellent ductility (an abundance of dimples in fracture surface). As a result, the superb joint performance was due to competition and coordination of multi-precipitates. This work offers a new technological paradigm to develop the aero-engine manufacturing industry for engineers and designers.

Research Area(s)

  • Failure mechanism, FGH98 superalloy, High entropy alloy, Multi-precipitates, Plastic deformation behavior

Citation Format(s)

Ultrastrong and ductile transient liquid phase (TLP) bonding joints reinforced by ordered multi-precipitates. / Yuan, L.; Xiong, J. T.; Ren, J.; Yang, T.; Xiao, X.; Ma, Y. K.; Luan, J. H.; Li, J. L.

In: Composites Part B: Engineering, Vol. 231, No. Part B, 109568, 15.02.2022.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review