Gradient and lamellar heterostructures for superior mechanical properties

Wu, Xiaolei; Zhu, Yuntian

doi:10.1557/s43577-021-00056-w

Cited by 74 publications

(10 citation statements)

References 59 publications

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“…[27] The high strength and ductility of gradient materials arise from mutual coupling between the coexisting small-grained and large-grained zones in the same microstructure. [28] The difference in flow stresses results in a nonuniform response to the applied strain. The large-grained zone undergoes larger deformation, while the small-grained zone acts as a barrier to prevent dislocation sliding, thus increasing the resistance of the material.…”

Section: Introductionmentioning

confidence: 99%

Synergistic Strengthening of Dislocation and Heterodeformation Induced in Gradient Nanograined Copper Film: A Molecular Dynamics Study

Qiang

Long

2023

Physica Status Solidi (a)

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Unlike conventional homogeneous nanograined (NG) materials, gradient structured materials combine high strength and ductility. The gradient nanograined (GNG) structures are divided into three zones by grain size: the small‐grained zone, the transition‐grained zone, and the large‐grained zone. Molecular dynamics (MD) simulation is performed to investigate the effect of the widths of zones on the strength of GNG structures with different grain sizes. The simulation results reveal the strengthening mechanism of GNG structures from the perspective of microstructure evolution. With the change in grain size, the dominant deformation mode changes from grain boundary (GB) activities in the mall‐grained zone to dislocation slip in the large one. The inverse Hall–Petch phenomenon is observed during plastic deformation. Synergistic strengthening of dislocation and heterodeformation induced (HDI) can be achieved in the structure by regulating the widths of zones with different grain sizes.

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Section: Introductionmentioning

confidence: 99%

Synergistic Strengthening of Dislocation and Heterodeformation Induced in Gradient Nanograined Copper Film: A Molecular Dynamics Study

Qiang

Long

2023

Physica Status Solidi (a)

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“…[1] HS materials share one common role that soft zones are constrained by hard zones or matrix. [2] It is the interaction between hard matrix and soft zones during deformation that leads to the superior strength-ductility synergy.…”

Section: Introductionmentioning

confidence: 99%

Dislocation hardening coupling between hard matrix and soft zones in a dual-phase heterostructured material

Liu²,

Liu³

2023

J. Phys.: Conf. Ser.

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Strain hardening coupling between hard and soft zones is still not well understood in heterostructured materials. Here we report the coupling of dislocation hardening between hard iron matrix and soft copper zones in heterostructured Fe-40Cu dual-phase materials. Dislocation hardening is the predominant hardening mechanism in the Fe-40Cu materials, as dislocations dominate plastic deformation in both iron and copper. Low-temperature annealing kept highly deformed iron matrix strong and inductile but softened copper zones by promoting recrystallization in them. This raised plastic incompatibility and strain partitioning between iron matrix and copper zones during deformation. As a result, dislocations accumulated dramatically in copper zones but barely in the iron matrix. Copper zones produced high dislocation hardening to compensate for the low one of the iron matrix, raising the total strain hardening of the heterostructured Fe-40Cu materials. Lowering the plastic incompatibility between the iron matrix and copper zones weakened the strain partitioning between them and consequently depressed the dislocation hardening of copper zones. The role that copper zones played turned from producing high dislocation hardening to stabilizing the plastic deformation of heterostructured Fe-40Cu materials at the high strain level.

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“…Thus, strain gradient is necessary near the zone interface to accommodate the strain partitioning (Zhu and Wu, 2019). There is clear evidence that rapid accumulation of GNDs in the hetero-zone boundary-affected regions (HBARs) (Wu and Zhu, 2021) will result in a significant HDI effect at low strain (>4.5%), while dislocation hardening dominates at higher strain levels (Fang et al, 2020).…”

Section: Introduction Heterostructured Materialsmentioning

confidence: 99%

Mechanical Properties and Deformation Mechanisms of Heterostructured High-Entropy and Medium-Entropy Alloys: A Review

2022

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Recently, heterostructured (HS) materials, consisting of hard and soft zones with dramatically different strengths, have been developed and received extensive attention because they have been reported to exhibit superior mechanical properties over those predicted by the rule of mixtures. Due to the accumulation of geometrically necessary dislocations during plastic deformation, a back stress is developed in the soft zones to increase the yield strength of HS materials, which also induce forward stress in the hard zones, and a global hetero-deformation induced (HDI) hardening to retain ductility. High-entropy alloys (HEAs) and medium-entropy alloys (MEAs) or multicomponent alloys usually contain three or more principal elements in near-equal atomic ratios and have been widely studied in the world. This review paper first introduces concepts of HS materials and HEAs/MEAs, respectively, and then reviewed emphatically the mechanical properties and deformation mechanisms of HS HEAs/MEAs. Finally, we discuss the prospect for industrial applications of the HS HEAs and MEAs.

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Gradient and lamellar heterostructures for superior mechanical properties

Cited by 74 publications

References 59 publications

Synergistic Strengthening of Dislocation and Heterodeformation Induced in Gradient Nanograined Copper Film: A Molecular Dynamics Study

Synergistic Strengthening of Dislocation and Heterodeformation Induced in Gradient Nanograined Copper Film: A Molecular Dynamics Study

Dislocation hardening coupling between hard matrix and soft zones in a dual-phase heterostructured material

Mechanical Properties and Deformation Mechanisms of Heterostructured High-Entropy and Medium-Entropy Alloys: A Review

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