Effects of liquid separation on the microstructure formation and hardness behavior of undercooled Cu–Co alloy

Yang, Wulin; Chen, S. H.; Yu, Huan; Li, S.; Liu, F.; Gao, Yang

doi:10.1007/s00339-012-7090-4

Cited by 19 publications

(5 citation statements)

References 16 publications

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“…As the liquid-phase separation process determines the final solidification structure, many studies have been carried out on it [1][2][3][4][5][6][7][8][9]. It turned out that the minor volume phase will generate in the form of droplets, and the structure evolution mainly involves nucleation and coagulation of the minor droplets due to Marangoni and Stokes motions.…”

Section: Introductionmentioning

confidence: 99%

Macrosegregation driven by movement of minor phase in (Al0.345Bi0.655)90Sn10 immiscible alloy

Zhang

2014

Appl. Phys. A

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Formation of macrosegregation structure in (Al 0.345 Bi 0.655 ) 90 Sn 10 (mass percent, the same below) immiscible alloy was investigated by spraying its melt into silicone oil. Two kinds of typical macrosegregation structures were obtained in the dispersed alloy spheres: core/ shell structure and crescent structure. Based on the estimated temperature field inside the alloy spheres, the velocities of thermal Marangoni, solutal Marangoni, and Stokes motions of the Bi-rich minor droplets were calculated. Analysis shows that surface segregation, Soret effect, thermal Marangoni motion, solutal Marangoni motion, and Stokes motion play a key role in the formation of Al/Bi-Sn core/shell structure. If the liquid alloy spheres solidify on the condition that the radius of the Bi-rich minor droplets is smaller than a critical value, it will form Al/Bi-Sn core/ shell structure, while the crescent structure will be formed when the liquid alloy spheres frozen on the condition that the radius of the Bi-rich minor droplets exceeds the critical value.

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Section: Introductionmentioning

confidence: 99%

Macrosegregation driven by movement of minor phase in (Al0.345Bi0.655)90Sn10 immiscible alloy

Zhang

2014

Appl. Phys. A

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“…The similar research conducted by Ma et al focused on adding graphene nanosheets (GNSs) into the Sn-58Bi solder, and the result revealed that mechanical properties and the microstructure of this synthesized solder were modified by 0.03 wt% GNSs addition during solid-state aging [21]. Besides, alloying copper substrate was another effective method to inhibit the formation of microvoids at the joint interface [22][23][24][25][26][27][28]. Zou et al have explored the influences of small amount of Ag, Al, Sn or Zn addition to Cu substrate on the microstructure evolution of the joint and found that these microelements could not only restrain the interfacial Bi segregation, but also reduce the formation of voids at the interface between the solder and substrate [29].…”

Section: Introductionmentioning

confidence: 88%

Influences of Ni addition into Cu–xNi alloy on the microstructure evolution and mechanical property of Sn–58Bi/Cu–xNi solder joint

Cheng

et al. 2020

Appl. Phys. A

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In the current investigation, various mass fractions (0, 0.5, 1.5, 5 and 10 wt%) of Ni were doped into Cu substrate, and influences of Ni addition on the microstructure evolution and mechanical property of the Sn-58Bi/Cu-xNi solder joint were investigated. Results showed that the growth rate of intermetallic compound (IMC) would increase with the Ni addition added from 0 to 5 wt% and remarkably decreased for Sn-58Bi/Cu-10Ni joint system. It indicated that the growth rate of IMC layer would decrease when 10 wt% Ni was added into the alloy. Besides, the tensile strength reduced with increase in the IMC thickness, which was under the synergistic effect of increasing liquid-state reaction time and the content of Ni addition (0-5 wt%). Moreover, the fracture mechanism gradually transformed from ductile fracture mode to brittle fracture mode with the decrease in joint strength.

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“…Microstructure formation in phase-separated Cu-Co alloys has been well documented. It is very sensitive to processing conditions such as liquid undercoolings and cooling rates [10][11][12]14,15,[17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35]. Electromagnetic levitation and glass-fluxing were used to undercool bulk Cu-Co alloys [8,15,[17][18][19]22,[24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

“…It is very sensitive to processing conditions such as liquid undercoolings and cooling rates [10][11][12]14,15,[17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35]. Electromagnetic levitation and glass-fluxing were used to undercool bulk Cu-Co alloys [8,15,[17][18][19]22,[24][25][26][27][28][29][30]. Accessed undercoolings often exceeded a critical value for triggering the metastable liquid phase separation.…”

Section: Introductionmentioning

confidence: 99%

Liquid phase separation in undercooled Cu–Co alloys under the influence of static magnetic fields

Zhao

Gao

2019

Phil. Trans. R. Soc. A.

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Undercooling of Cu-based alloys often induces metastable liquid phase separation followed by rapid solidification of separated liquids. The rapid solidification can help freeze in the morphology of a higher-melting liquid and eases difficulties in studies of liquid phase separation kinetics. In the present work, the influence of static magnetic fields on liquid phase separation in bulk Cu 84 Co 16 composition was investigated. Inductively melted samples were glass-fluxed, undercooled and solidified under uniform and non-uniform magnetic fields generated by a superconducting magnet. Solidification microstructure of the phase-separated samples was examined using an optical microscope. The imposition of the magnetic fields, both uniform and non-uniform, altered the morphology, segregation pattern and size distribution of Co-rich droplets due to liquid phase separation. The imposition of the non-uniform magnetic fields with positive and negative gradients brought about segregation of the Co-rich droplets at the top and the bottom side of the samples, respectively. Such influence of the static magnetic fields is interpreted by assuming intensification of convective flow and Kelvin force-controlled migration of the Co-rich droplets. This article is part of the theme issue ‘Heterogeneous materials: metastable and non-ergodic internal structures’.

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Effects of liquid separation on the microstructure formation and hardness behavior of undercooled Cu–Co alloy

Cited by 19 publications

References 16 publications

Macrosegregation driven by movement of minor phase in (Al0.345Bi0.655)90Sn10 immiscible alloy

Macrosegregation driven by movement of minor phase in (Al0.345Bi0.655)90Sn10 immiscible alloy

Influences of Ni addition into Cu–xNi alloy on the microstructure evolution and mechanical property of Sn–58Bi/Cu–xNi solder joint

Liquid phase separation in undercooled Cu–Co alloys under the influence of static magnetic fields

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