首页|Interface healing mechanism of fine-grained Ni-Co-based superalloy during hot-compression bonding

Interface healing mechanism of fine-grained Ni-Co-based superalloy during hot-compression bonding

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The interface healing mechanism of fine-grained Ni-Co-based superalloy during hot-compression bonding(HCB)is investigated.During HCB,the incompatibility of deformation between the γ and the primary γ'leads to a large number of dislocation pairs(DP),stacking faults(SF),and micro-twins(MT)in the pri-mary γ'.These defects act as fast channels for elemental diffusion,leading to supersaturation of the pri-mary γ'and promoting the growth of the γ-shell.On the one hand,the primary γ'with a γ-shell moves towards the bonding interface due to anomalous yielding phenomena of the primary γ'and plastic flow during HCB process.The increase in the number of defects leads to the growth of γ-γ'heterogeneous epitaxial recrystallization(HERX)grain with coherent structure at the bonding interface,which promotes the bulge of the interface grain boundaries(IGBs).On the other hand,the nucleation and growth of a necklace-like distribution of discontinuous dynamic recrystallization(DDRX)grain at the interface lead to the healing of IGBs.With the synergistic action of DDRX and HERX,the mechanical properties of Ni-Co-based superalloy joints through HCB achieve the same level as the base material.This finding further enriches the theory of interface healing in HCB.

Hot-compression bondingNi-Co-based superalloyDiscontinuous dynamic recrystallizationHeterogeneous epitaxial recrystallization

Shaofei Ren、Xiaolong Bai、Sheng Liu、Mingyue Sun、Bin Xu、Chuanyong Cui

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Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China

Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China

School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China

China United Gas Turbine Technology Co.,Ltd.,Beijing 100016,China

Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China

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National Key Research and Development ProgramNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Science and Technology Major Project of ChinaStrategic Priority Research Program of the Chinese Academy of sciencesChina Postdoctoral Science FoundationChina Postdoctoral Science FoundationIMR Innovation FoundationLingChuang Research Project of China National Nuclear CorporationCNNC Science Fund for Talented Young ScholarsYouth Innovation Promotion Association,CAS

2018YFA0702900521733055210106152233017522033842019ZX06004010XDC040000002020M6810042021M7032762022-PY12

2024

10.1016/j.jmst.2023.06.040

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)：2024.173(6)
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