The “pinning” effect of in-situ TiB whiskers on the hot deformation behavior and dynamic recrystallization of (10 vol%) TiB/Ti–6Al–4V composites

Wei, Jiashu; Yang, Fang; Qi, Miao; Zhang, Chenzeng; Chen, Cunguang; Guo, Zhimeng

doi:10.1016/j.jmrt.2022.12.048

Cited by 13 publications

(4 citation statements)

References 40 publications

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“…In fact, tensile deformation is the process of dislocation slip; above the slip surface, the dislocation center region is compressive stress, while below the slip surface, it is tensile stress. During the tensile process, the C and N interstitial atoms interact with the dislocations and are deflected below the edge dislocations, which can offset some of the stresses, thus stabilizing the dislocations and having a "pinning effect" on the dislocation movement [22]. Upon subjecting the material to various temperature aging treatments, the interaction forces between C and N atoms and dislocations exhibit dissimilarities, influencing the hindrance levels to dislocation motion.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…This variability in hindrance directly affects changes in yield strength during the tensile process, thereby exerting an impact on the tensile curve. "pinning effect" on the dislocation movement [22]. Upon subjecting the material to various temperature aging treatments, the interaction forces between C and N atoms and dislocations exhibit dissimilarities, influencing the hindrance levels to dislocation motion.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

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The Influence of Strain Aging at Different Temperatures on the Mechanical Properties of Cold-Drawn 10B21 Steel Combined with an Electron Microscope Study of the Structures

Dong,

Lu,

Wang

et al. 2024

Materials

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The effect of aging treatments at various temperatures on the mechanical properties and microstructure of 10B21 cold heading steel with a 20% reduction in area (ε = 0.1) was investigated. The mechanical properties were evaluated based on tensile tests and hardness tests, while the evolution of microstructure was observed by using an optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray diffraction (XRD). The results reveal that aging treatment enhance the strength and hardness of 10B21 cold heading steel after drawing, and the highest values of strength and hardness are attained at an aging temperature of 300 °C. Specifically, the yield and ultrahigh tensile strength after aging at 300 °C are measured at 620 MPa and 685 MPa, respectively, which are 30 MPa and 50 MPa higher than the cold-drawn sample. Moreover, the hardness after aging at 300 °C reaches 293 HV, which has an increase of 30 HV compared to the cold-drawn state. The improvement in mechanical properties may be related to the strain-aging mechanism and the increased density of dislocations. In addition, the analysis of the TEM results reveal that the presence of the second-phase Ti(C,N) contributes to pinning the dislocations, whereas the dislocations are pinned between the cementite (Fe3C) lamellar and stacked at the grain boundaries, leading to strain hardening of the material.

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Section: Mechanical Propertiesmentioning

confidence: 99%

Section: Mechanical Propertiesmentioning

confidence: 99%

The Influence of Strain Aging at Different Temperatures on the Mechanical Properties of Cold-Drawn 10B21 Steel Combined with an Electron Microscope Study of the Structures

Dong,

Lu,

Wang

et al. 2024

Materials

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“…Note that at the dependence point ψ = η, the functions describing tangential stresses in the upper and lower layers differ by the value 1 24 δ 2 k(γ − 1), independent of the proportion of layers and by an order of magnitude smaller than the square of the parameter of the share of the diffusion layer in the total thickness of the beam. Formally, we can define the constant C 0 as half of this difference.…”

Section: Fracture Criterion Of the Layermentioning

confidence: 99%

“…To date, composite materials based on titanium borides are of great scientific and practical interest. These materials provide the highest specific strength and modulus of elasticity compared to steel and nickel alloys, while their density is significantly lower [1][2][3][4][5]. However, the requirements to the physical-mechanical and operational properties of composite materials are increasing every year due to their work in heavier and more loaded conditions.…”

Section: Introductionmentioning

confidence: 99%

Influence of Layer-Thickness Proportions and Their Strength and Elastic Properties on Stress Redistribution during Three-Point Bending of TiB/Ti-Based Two-Layer Ceramics Composites

Khvostunkov,

Bazhin,

et al. 2023

Metals

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A mathematical model was developed to determine the order of failure of layers in a two-layer ceramics composite and to determine the conditions for achieving the maximum limit load under three-point loading. The model was set in the space of three “bilayer parameters”: the ratio of the thickness of the lower layer to the whole thickness of the beam, the ratio of Young’s moduli of the lower layer to the upper layer, and the ratio of flexural strengths of the materials of the lower layer to the upper layer. The adequacy of the model obtained was confirmed by experimental results on the three-point bending of the experimental specimens. The experimental samples were two-layer composites consisting of a cermet layer TiB/Ti and a layer of α-Ti. The samples were obtained by free self-propagating high-temperature synthesis (SHS) compression and with varying their thickness. The results obtained make it possible to predict in advance which layer, based on the specific bilayer parameters, will trigger the brittle fracture mechanism as well as to set the maximum destructive load of bilayer composites.

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Microstructural Evolution and Deformation Mechanisms of In Situ TiC Reinforced Ti‐6Al‐4V Composites during High‐Temperature Hot Compression

Dong,

Zheng,

Tuo

et al. 2024

Adv Eng Mater

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Deformation processing is a key strategy to improve the strength and ductility of metal structural materials, especially metal matrix composites. Herein, TiC/Ti‐6Al‐4V (TiC/TC4) composites with discontinuous network structures were in‐situ spark plasma sintered using reinforcement precursors of reduced graphene oxide to reinforce TC4 matrix. In order to investigate the hot deformation behaviors and mechanisms of Ti matrix composites, the designed TiC/TC4 composites were hot compressed over temperature range of 870 ∽ 1070 oC and strain range of 0.001 ∽ 10 s‐1. The results indicate the optimal processing window of hot deformation are mainly within the temperature range of 890 ∽ 970 oC and the strain rate range of 0.01 s‐1 ∽ 0.1 s‐1. The flow instability of TiC/TC4 composites occurs in the temperature range of 890 ∽ 930 oC and 1000 ∽ 1060 oC at the strain rate range from 0.1 s‐1 ∽ 10 s‐1. The thermal activation energies of TiC/TC4 composites in the (α+β) and β‐phase regions are 528.22 kJ/mol and 524.24 kJ/mol, respectively. The thermal deformation mechanism of TiC/TC4 composites in the processing window region involves a combination of continuous dynamic recrystallization (CDRX) and discontinuous dynamic recrystallization (DDRX). The pinning effect of TiC can effectively hinder the dislocation motion, leading to the generation of high‐density dislocations around TiC. Consequently, this promotes sub‐grains formation and rotation, facilitating CDRX. Meanwhile, TiC particle induces high‐angle grain boundary migration and provides more nucleation sites for recrystallized grains. Hence, TiC impedes the growth of recrystallized grains, promoting the formation of fine equiaxed grain through DDRX. These findings enhance understand the role of hot deformation behaviors of Ti matrix composites and provide insights for their deformation processing.This article is protected by copyright. All rights reserved.

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The “pinning” effect of in-situ TiB whiskers on the hot deformation behavior and dynamic recrystallization of (10 vol%) TiB/Ti–6Al–4V composites

Cited by 13 publications

References 40 publications

The Influence of Strain Aging at Different Temperatures on the Mechanical Properties of Cold-Drawn 10B21 Steel Combined with an Electron Microscope Study of the Structures

The Influence of Strain Aging at Different Temperatures on the Mechanical Properties of Cold-Drawn 10B21 Steel Combined with an Electron Microscope Study of the Structures

Influence of Layer-Thickness Proportions and Their Strength and Elastic Properties on Stress Redistribution during Three-Point Bending of TiB/Ti-Based Two-Layer Ceramics Composites

Microstructural Evolution and Deformation Mechanisms of In Situ TiC Reinforced Ti‐6Al‐4V Composites during High‐Temperature Hot Compression

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