Deformation mechanisms to ameliorate the mechanical properties of novel TRIP/TWIP Co-Cr-Mo-(Cu) ultrafine eutectic alloys

Kim, J. T.; Hong, Seung Hyun; Park, H. J.; Kim, Y. S.; Suh, Jin-Yoo; Lee, J. K.; Park, J. M.; Maity, T.; Eckert, J.; Kim, K. B.

doi:10.1038/srep39959

Cited by 24 publications

(5 citation statements)

References 51 publications

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“…The hardness of the unmodified C17200 Cu substrate increases rapidly with the growth of the indentation depth and then gradually decreases after it reaches 5 GPa, until it keeps constant at 2.3 GPa during the unloading process. The increase in hardness in the early stage is caused by the size effect and the work-hardening effect [21][22][23][24]. Similarly, the modulus of the C17200 substrate turns to be about 150 GPa after a rapid growth.…”

Section: Resultsmentioning

confidence: 99%

Effects of the Prefabricated Cu-Ti Film on the Microstructure and Mechanical Properties of the Multiphase Coating by Thermo Plasma Nitriding on C17200 Cu Alloy

et al. 2019

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To improve the surface wear resistance, plasma nitriding of the prefabricated Cu-Ti films on the C17200 Cu alloy is performed to investigate the effects of the composition of the Cu-Ti films on the microstructure and the mechanical properties of the modified surface. The results firstly showed that obvious microstructure evolution appeared during the thermo-plasma nitriding process, where both the surface morphology of the composed phases and the cross-sectional profiles of the multiphase coatings varied for the three types of films. Small amounts of Ti-N compounds, Be 3 Ti 2 Cu, and different types of Cu-Ti intermetallics formed in the multiphase coating after plasma nitriding, which is dependent on the composition of the prefabricated Cu-Ti film. Correspondingly, the surface hardness and the wear resistance of the C17200 Cu substrates were obviously improved, with the obtained adhesive strength of the substrate reaching a satisfactory range. Coatings 2019, 9, 694 2 of 15where the Cu-Ti intermetallics of varying Cu/Ti ratios and the Ti-N compounds of different Ti content were identified. The simulation results by the first-principle study also indicated the possibility for the formation of these phases and the possible contribution to the improvement of the surface mechanical properties [14,15]. However, the low efficiency of the surface modification process prompts us to propose the novel process by combination of the fabrication of a gradient Cu-Ti film and the plasma nitriding in our recent research, which shows great potentiality to produce the multiphase coating efficiently, with the obtained wear properties at the same level [16], which can also help to solve the problem of weak bonding strength between the single-layered Ti-N coating and the subsurface layer by the formation of Cu-Ti intermetallics between the Cu substrate and the Ti-N surface layer [8]. Actually, the Cu content in the prefabricated film should also contribute to the changing mechanical properties of the coating [17,18]. However, the previous investigations paid little attention to the influence of the initial Cu-Ti film composition on the obtained mechanical properties for the multiphase coating on C17200 Cu alloys.This paper discusses a further study on the effects of the prefabricated Cu-Ti film on the microstructure and mechanical properties of the multiphase coating by thermo plasma nitriding on C17200 Cu alloy. First, the microstructure and the surface characteristic of the prefabricated Cu-Ti film were studied. Then, the microstructure evolution during the plasma nitriding process was explored. Finally, the mechanical properties and the wear performance of the three types of coatings were evaluated. Materials and Methods Experimental Material and MethodThe chemical composition of the C17200 Cu alloy is listed in Table 1. The copper alloy bar was processed into a size of φ20 mm × 4.5 mm, by wire-cutting for the subsequent surface modification treatment, the structure analysis of the modified layer, and the mechanical performance tes...

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Section: Resultsmentioning

confidence: 99%

Effects of the Prefabricated Cu-Ti Film on the Microstructure and Mechanical Properties of the Multiphase Coating by Thermo Plasma Nitriding on C17200 Cu Alloy

et al. 2019

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“…The inclusion of brittle second phases helps to obtain an increase in shortening at a higher rate than does the load 26,27 , while plastic strain of Al alloys is enhanced influenced by the increased volume fraction of ductile α-Al solid solution and the lower amount of brittle intermetallic compounds 28 . In materials with hierarchical and/or complex microstructures there are reported both hardening and softening mechanisms, such as the works of Kim et al [28][29][30] , which revealed high work hardening rates at initial stages of plastic deformation. These rates gradually decreased at larger deformations, even obtaining negative values after the middle of plastic deformation, which indicates work softening behavior and the modification of the dominant deformation mechanism.…”

Section: Compressive Behaviormentioning

confidence: 99%

Fractal and Conventional Analysis of Cu Content Effect on the Microstructure of Al-Si-Cu-Mg Alloys

et al. 2020

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“…3a and Fig. 3b, respectively, where is obtained from Hollomon's equation: 26 (1) with denoting the flow stress and the strength coefficient. Even though is usually considered to be a constant, it is strain dependent in this case.…”

Section: Stress-strain Behaviormentioning

confidence: 99%

Cryogenic temperature toughening and strengthening due to gradient phase structure

Ren

et al. 2018

Materials Science and Engineering: A

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Cold embrittlement is one of the primary concerns challenging the usage of steels in infrastructures like pipelines and ocean platforms. This challenge is also compounded by the limited selection of materials for application in a cold and corrosive environment. Inspired by recent progresses in developing gradient structured materials with extraordinary properties, here we report a class of stainless steels with gradient phase structures achieving a superb combination of strength (1753MPa) and tensile ductility (>25%) at the cryogenic temperature of 77K. A set of cylindrical steel samples acquire a graded mixture of hard martensitic and soft austenitic phases through pre-torsion, which results in an optimal stress partition in the material -the hard martensitic structures showing a positive density gradient from core to edge carry higher stress near the edge, while the soft austenitic phase showing a negative density gradient from core to edge serves to retain substantial 2 tensile ductility. The phase-transformation at low temperature in gradient structures and the resulted work-hardening could be adopted to enhance the ductility and strength of widely used engineering materials for their applications in harsh environment.

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Deformation mechanisms to ameliorate the mechanical properties of novel TRIP/TWIP Co-Cr-Mo-(Cu) ultrafine eutectic alloys

Cited by 24 publications

References 51 publications

Effects of the Prefabricated Cu-Ti Film on the Microstructure and Mechanical Properties of the Multiphase Coating by Thermo Plasma Nitriding on C17200 Cu Alloy

Effects of the Prefabricated Cu-Ti Film on the Microstructure and Mechanical Properties of the Multiphase Coating by Thermo Plasma Nitriding on C17200 Cu Alloy

Fractal and Conventional Analysis of Cu Content Effect on the Microstructure of Al-Si-Cu-Mg Alloys

Cryogenic temperature toughening and strengthening due to gradient phase structure

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