首页|High-density dislocation and ductile precipitate synergistically reinforced TiAl/Ni-based superalloy joint using novel multi-principal element interlayer

High-density dislocation and ductile precipitate synergistically reinforced TiAl/Ni-based superalloy joint using novel multi-principal element interlayer

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An extremely high-strength TiAl/Ni-based superalloy dissimilar joint was obtained using a designed Ni25Zr25Sn20Cu10Hf10Cr5Fe5 multi-principal element interlayer via contact reaction brazing.It was found that a joint mainly composed of eutectic structure of(Ni)ss,(Ni,Cr,Fe)ss,and(Cr,Ni,Fe,Mo)ss,as well as micro-nano precipitates of(Ti)ss and(Hf,Zr)ss,could be achieved through the interaction between the interlayer and the base metals.The joint exhibited a shear strength of 498 MPa when brazed at 1190℃ for 10 min,while the fracture occurred within the TiAl base metal,and the retention rate of high-temperature(HT)strength(650 ℃)was～100％.The strengthening mechanism of the brazed joint was systematically discussed by transmission electron microscopy(TEM).It was shown that high-density dis-locations existed in each phase of the seam as well as twinning and stacking faults existed in the micro-nano precipitates,caused by a mass of solute atoms,greatly strengthened the joint.At HTs,the dislocation strengthening effect weakened due to grain recovery and recrystallization,but the joint could be addi-tionally toughened by multi-cracking.Meanwhile,granular(Ti)ss dispersed through the seam and ductile reticular structure(Ni)ss toughened the joint via the mechanism of crack termination and bridging.The proposed method provides a new approach for high strength and heat resistance joining of TiAl/Ni-based superalloy in aeroengine components.

Multi-principal element interlayerMechanical propertiesStrengthening mechanismHigh-entropy effectDislocations strengthening

Xinyue Li、Jincheng Lin、Panpan Lin、Shuye Zhang、Xinfei Zhang、Fugang Lu、Ce Wang、Tiesong Lin、Peng He

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State Key Laboratory of Advanced Seaming and Joining,Harbin Institute of Technology,Harbin 150001,China

Zhengzhou Research Institute,Harbin Institute of Technology,Zhengzhou 450018,China

National Natural Science Foundation of China(NSFC)National Natural Science Foundation of China(NSFC)National Natural Science Foundation of China(NSFC)National Natural Science Foundation of China(NSFC)National Natural Science Foundation of China(NSFC)National MCF Energy R&D ProgramFundamental Research Funds for the Central UniversitiesFundamental Research Funds for the Central UniversitiesNatural Science Foundation of Heilongjiang Province,China

5197410151975150U21A2012852175302U22A201852019YFE031001002022FRFK060009HIT.DZJJ.2023011JQ2020E003

2024

10.1016/j.jmst.2023.09.058

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.183(16)