Effect of the Difference in Strength of Hard and Soft Components on the Synergetic Strengthening of Layered Materials

Kim, Jung Gi; Bae, Jae Wung; Park, Jeong Min; Woo, Wanchuck; Harjo, Stefanus; Lee, Sunghak; Kim, Hyoung Seop

doi:10.1007/s12540-020-00657-1

Cited by 13 publications

(4 citation statements)

References 27 publications

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“…First of all, the central layer owns the partial recrystallized microstructure with low-level recrystallization, which contributes to the high mechanical incompatibility between the central layer and the coarse-grained zone at the surface layer. Generally, the magnitude of the strain gradient increases with larger mechanical incompatibility [9], and the GND density is proportional to the strain gradient [10]. Considering that the HDI strengthening and hardening are mainly caused by the GND pile-up [12], it can be easily deduced that the relatively hard microstructure in the central layer with a large strength difference compared with the surface layer may enhance the strength-ductility combination.…”

Section: Microstructural Evolution During Tensile Deformationmentioning

confidence: 99%

“…Hasan et al proposed that enlarging the strength difference between the surface and the undeformed core will significantly improve the strength-ductility synergy [8]. In their opinion, it is because the higher strength incompatibility in the adjacent layers can increase the magnitude of the strain gradient and the density of the geometrically necessary dislocation [9,10], which finally enhance the effects of hetero-deformation-induced strengthening and strain hardening, producing better mechanical properties [11,12]. However, Wang et al found that the strain gradient-related strengthening effect does not increase linearly with an increasing strain gradient in the interface affected zone due to the dynamical formation and disappearance of geometrically necessary dislocation pileups [9].…”

Section: Introductionmentioning

confidence: 99%

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Strength–Ductility Mechanism of CoCrFeMnNi High-Entropy Alloys with Inverse Gradient-Grained Structures

Chen,

Hu,

Wang

et al. 2024

Materials

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The microstructures and mechanical properties of equiatomic CoCrFeMnNi high-entropy alloys (HEAs) treated with various processing parameters of laser surface heat treatment are studied in this paper. The typical inverse gradient-grained structure, which is composed of a hard central layer and a soft surface layer, can be obtained by laser surface heat treatment. A much narrower gradient layer leads to the highest yield strength by sacrificing ductility when the surface temperature of the laser-irradiated region remains at ~850 °C, whereas the fully recrystallized microstructure, which exists from the top surface layer to the ~1.05 mm depth layer, increases the ductility but decreases the yield strength as the maximum heating temperature rises to ~1050 °C. Significantly, the superior strength–ductility combination can be acquired by controlling the surface temperature of a laser-irradiated surface at ~1000 °C with a scanning speed of ~4 mm/s due to the effect of hetero-deformation-induced strengthening and hardening, as well as the enhanced interaction between dislocation and nanotwins by the hierarchical nanotwins. Therefore, retaining the partial recrystallized microstructure with a relatively high microhardness in the central layer, promoting the generation of hierarchical nanotwins, and increasing the volume proportion of gradient layer can effectively facilitate the inverse gradient-grained CoCrFeMnNi HEAs to exhibit a desirable strength–ductility synergy.

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Section: Microstructural Evolution During Tensile Deformationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Strength–Ductility Mechanism of CoCrFeMnNi High-Entropy Alloys with Inverse Gradient-Grained Structures

Chen,

Hu,

Wang

et al. 2024

Materials

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“…Generally, heterostructured materials composed of relatively soft and hard metallic components can achieve enhanced strength and uniform elongation through an additional strengthening at the interface, called hetero-deformation-induced (HDI). [8][9][10] When the interface between the soft and hard regions is deformed, the softer region undergoes plastic deformation earlier while the harder region experiences elastic deformation. To alleviate the resulting strain incompatibility, an additional strengthening effect occurs by reducing it by newly generated geometrically necessary dislocations (GNDs) at the interface.…”

Section: Introductionmentioning

confidence: 99%

Non‐Hetero‐Deformation‐Induced Hardening in Steel/Polymer/Steel Layered Sheet: Experiment and Modeling Analyses

Kim,

Gu,

Kim

et al. 2024

Adv Eng Mater

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The mechanical properties of the steel/polymer/steel layered material were determined by taking the sum or average of the properties of its constituent components. To understand the reasons behind non‐hetero‐deformation‐induced hardening at the deformed polymer/steel interface, a combined approach of experimental methods and modeling techniques was employed.This article is protected by copyright. All rights reserved.

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“…7 In latest researches, ZrO 2 3,10–13 Mo 2 C, 14 TiC, 15 MgO, 16–18 Al 2 O 3 1,2,19 have replaced the metallic constituent and providing the requisite toughening to improve mechanical properties and low cost. Nowadays, toughening of ceramic is acquired by particle toughening (ZrO 2 , Mo 2 C, TiC, Al 2 O 3 , MgO), 20 phase transformation, 21 microcrack toughening, whiskers, and nano-reinforcements (graphene, carbon nanotubes (CNTs), boron nitride nanotubes, etc.). 22 It has been seen that the a certain percentage reinforcement of nano-graphene platelets and CNTs influence the fracture resistance of composites to a greater extent by virtue of different toughening mechanisms such as crack deflection, crack bridging, and pull out.…”

Section: Introductionmentioning

confidence: 99%

A review of fabrication and properties of spark plasma sintered tungsten carbide based advanced composites

Dar

Sheikh

2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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The high-performance tool materials have been inevitably used for most of the cutting tool applications where high reliability and difficult to cut materials are of major demand. The cemented carbides and its composites offer an excellent combination of the properties where it can be used for tool materials due to its high wear resistance, high hardness at elevated temperatures, and considerable fracture toughness. However to obtain optimum values of mechanical properties and uniformly distributed ultrafine grains, a number of new fabrication techniques, alteration in the content of cemented carbide composition, and variation in the parameters of fabrication process have been employed. This review paper will come in handy for researchers and scientists working on advanced cemented carbides and spark plasma sintering as it overviews the recent work done on tungsten carbide composites using the novel spark plasma sintering technique considering different process parameters in order to achieve ultrafine microstructures of sintered specimens, enhanced mechanical properties of composites in addition to energy as well as time saving considerations. The thorough review of various research papers revealed that the parameters of the sintering (sintering temperature, applied pressure, surrounding environment), additives in sintering (both content and composition), reinforcement of cemented carbide with other materials, nano-filler/whisker addition, partial or complete removal of metallic phase from the cemented carbide affect the properties of sintered specimens and their calculated as well as optimum setting can provide an excellent combination of properties desired in cutting tool operations.

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Effect of the Difference in Strength of Hard and Soft Components on the Synergetic Strengthening of Layered Materials

Cited by 13 publications

References 27 publications

Strength–Ductility Mechanism of CoCrFeMnNi High-Entropy Alloys with Inverse Gradient-Grained Structures

Strength–Ductility Mechanism of CoCrFeMnNi High-Entropy Alloys with Inverse Gradient-Grained Structures

Non‐Hetero‐Deformation‐Induced Hardening in Steel/Polymer/Steel Layered Sheet: Experiment and Modeling Analyses

A review of fabrication and properties of spark plasma sintered tungsten carbide based advanced composites

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