Microstructural considerations of enhanced tensile strength and mechanical constraint in a copper/stainless steel brazed joint

Li, Y.; Parfitt, David; Flewitt, Peter E J; Hou, Xueyan; Fonseca, Jairo; Chen, B.

doi:10.1016/j.msea.2020.139992

Cited by 14 publications

(7 citation statements)

References 49 publications

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“…However, the experimentally observed maximum shear strength is 84 MPa. A similar behavior was recently observed by Li et al 66 , where the authors studied the Cu/steel joint. According to their research, the discrepancy in the strength values are related to the mechanical constraint imposed by the geometrically necessary dislocations at the brazed joint.…”

Section: Resultssupporting

confidence: 88%

Vacuum brazing of Al2O3 and 3D printed Ti6Al4V lap-joints using high entropy driven AlZnCuFeSi filler

Sharma

Ahn

2021

Sci Rep

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In this work, we studied the brazing characteristics of Al2O3 and 3D printed Ti–6Al–4V alloys using a novel equiatomic AlZnCuFeSi high entropy alloy filler (HEAF). The HEAF was prepared by mechanical alloying of the constituent powder and spark plasma sintering (SPS) approach. The filler microstructure, wettability and melting point were investigated. The mechanical and joint strength properties were also evaluated. The results showed that the developed AlZnCuFeSi HEAF consists of a dual phase (Cu–Zn, face-centered cubic (FCC)) and Al–Fe–Si rich (base centered cubic, BCC) phases. The phase structure of the (Cu–Al + Ti–Fe–Si)/solid solution promises a robust joint between Al2O3 and Ti–6Al–4V. In addition, the joint interfacial reaction was found to be modulated by the brazing temperature and time because of the altered activity of Ti and Zn. The optimum shear strength reached 84 MPa when the joint was brazed at 1050 °C for 60 s. The results can be promising for the integration of completely different materials using the entropy driven fillers developed in this study.

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Section: Resultssupporting

confidence: 88%

Vacuum brazing of Al2O3 and 3D printed Ti6Al4V lap-joints using high entropy driven AlZnCuFeSi filler

Sharma

Ahn

2021

Sci Rep

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“…By means of EBSD for measuring the local orientation, the lattice curvature can be derived from the orientation differences between neighboring points. If elastic stresses are neglected, the density of geometrically necessary dislocations (GNDs) (ρ GND ) can be derived using the Nye dislocation-density tensor. , The ρ GND is calculated from the misorientation angle θ between the two points located at given distance x from each other, obeying the relationship of ρ GND = 2θ/( xb ). b is the Burgers vector with the value of 2.5 × 10 –10 m for 40CrNiMo steel …”

Section: Methodsmentioning

confidence: 99%

Unraveling the Origin of Tribomagnetization in Ferromagnetic Materials

Gao

Fan

Zhang

et al. 2020

ACS Appl. Mater. Interfaces

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Tribomagnetization, a natural phenomenon known for decades, has many engineering applications today. However, its intrinsic origin remains controversial and the mechanistic-based model has not yet been developed to predict the tribomagnetization behavior. In this work, the origin of tribomagnetization is investigated via both the experimental and modeling approaches. For the first time, the expansion of surface plastic deformation to the subsurface layer (i.e., dislocation strain gradient) is characterized in conjunction with the tribological behavior of the interface. By performing the reciprocating sliding experiment in a pin-on-block contact configuration, the tribomagnetization evolution in different wear regimes is followed, the geometrically necessary dislocations (GNDs) developed in the subsurface are measured, and the formation of characteristic magnetic domains is revealed. A tribomagnetization model is proposed on the basis of the sliding-induced plastic deformation mechanism with GNDs, bringing the missing link with classical tribology and ferromagnetism. The model reveals that the surface plastic strain and width of a wear scar are two crucial factors in determining the surface magnetic field changes. We believe that the tribomagnetization originates from the magnetic distortion accompanied by the progression of GNDs in the subsurface. Our hypothesis is supported by the good agreement between the model prediction and experimental observation.

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“…9b and d can produce a pinning effect on dislocation motion, and additional shear stress is needed to allow dislocations to by-pass the precipitates. This is the Orowan strengthening effect, and its contribution to the material strength can be estimated using Eq (7) [61,71,72].…”

Section: Strengthening Mechanisms and Strength Comparison With Litera...mentioning

confidence: 99%

“…ν = 0.28 is Poisson's ratio, and λ is the interparticle spacing with the value calculated to be 595 nm using Eq (8) [40,72]:…”

Section: Strengthening Mechanisms and Strength Comparison With Litera...mentioning

confidence: 99%

Blown-Powder Direct-Energy-Deposition of Titanium-Diboride-Strengthened In718 Ni-Base Superalloy

Sarkar¹,

Chen

Fitzpatrick

et al. 2023

Preprint

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Microstructural considerations of enhanced tensile strength and mechanical constraint in a copper/stainless steel brazed joint

Cited by 14 publications

References 49 publications

Vacuum brazing of Al2O3 and 3D printed Ti6Al4V lap-joints using high entropy driven AlZnCuFeSi filler

Vacuum brazing of Al2O3 and 3D printed Ti6Al4V lap-joints using high entropy driven AlZnCuFeSi filler

Unraveling the Origin of Tribomagnetization in Ferromagnetic Materials

Blown-Powder Direct-Energy-Deposition of Titanium-Diboride-Strengthened In718 Ni-Base Superalloy

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