Back stress in strain hardening of carbon nanotube/aluminum composites

Xu, Riwei; Fan, Genlian; Tan, Zhanqiu; Ji, Gang; Chen, Cai; Beausir, Benoît; Xiong, Ding‐Bang; Guo, Qiang; Guo, Cheng; Li, Zhi Qiang; Zhang, Di

doi:10.1080/21663831.2017.1405371

Cited by 81 publications

(17 citation statements)

References 29 publications

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“…As discussed above, back stress strengthening and work hardening have been believed responsible for the superior combination of strength and ductility of HS materials [1,2,39,61] as well as the Bauschinger effect [36,38,47,50]. To analyze this issue, let's look at the dislocation model of GND pile-up at an HS domain boundary in Figure 3.…”

Section: Issues With the Back Stress Conceptmentioning

confidence: 99%

Perspective on hetero-deformation induced (HDI) hardening and back stress

Zhu

2019

Materials Research Letters

779

135

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Heterostructured materials have been reported as a new class of materials with superior mechanical properties, which was attributed to the development of back stress. There are numerous reports on back stress theories and measurements with no consensus. Back stress is developed in soft domains to offset the applied stress, making them appear stronger, while forward stress is developed to make hard domains appear weaker. The extra hardening in heterostructured materials is resulted from interactions between back stresses and forward stresses, and should be described as hetero-deformation induced (HDI) hardening and the measured 'back stress' should be renamed HDI stress. IMPACT STATEMENT The 'back stress' hardening in the literature can be described more accurately as hetero-deformation induced (HDI) hardening and the measured 'back stress' should be renamed HDI stress.

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Section: Issues With the Back Stress Conceptmentioning

confidence: 99%

Perspective on hetero-deformation induced (HDI) hardening and back stress

Zhu

2019

Materials Research Letters

779

135

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“…Several other authors reported the increase in strength by Hall-Petch strengthening in CNT/Al composites as well. [132,[147][148][149][150]…”

Section: Hall-petch Strengtheningmentioning

confidence: 99%

Carbon Nanotube‐Reinforced Aluminum Matrix Composites

Mohammed

Chen

2019

Adv Eng Mater

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Herein, the investigations conducted in the area of aluminum (Al) matrix composites reinforced with carbon nanotubes (CNTs) are presented. The application of CNT reinforcement in Al alloys is driven by its exceptional chemical and mechanical properties. The critical issues in the processing techniques, challenges in the interfacial mechanisms between the Al matrix and CNTs, and strengthening effects due to the presence of reinforcements are reviewed. The mechanical properties of CNT/Al composites are found to be effectively enhanced with an addition of CNTs even at a small amount. The extent of strength improvements depends mainly on the dispersion of CNTs in the matrix and interfacial bonding between the matrix and CNTs. Limited theoretical modeling can predict the properties of CNT/Al composites to some extent, but without considering the detailed processing parameters. Based on the gaps identified here, future research directions are suggested, including the relationships between the processing parameters and micro-and nanostructures, and multiscale mechanical modeling and simulation, aiming to further understand the strengthening mechanisms and develop advanced CNT-reinforced Al and other metal composites for critical engineering applications.

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“…The heterogeneous structure is observed to produce an intrinsic synergetic strengthening, with its tensile strength much higher than that calculated by the rule of the mixture from separate layers, which is attributed to the macroscopic stress gradient and plastic incompatibility between layers [26,27]. For hierarchically structured metals with stable heterogeneous structures, their high ductility is attributed to extra strain hardening due to the presence of strain difference and the change of stress states, which generates GNDs and promotes the generation and interaction of dislocations [28]. As a result, the TiC p layer with a heterogeneous structure (PDZ and PRZ) provides extra strengthening effects.…”

Section: Discussionmentioning

confidence: 87%

Simultaneously increased strength and ductility via the hierarchically heterogeneous structure of Al-Mg-Si alloys/nanocomposite

Geng

Zhao

Qiu

et al. 2020

Materials Research Letters

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The increase in strength usually accompanies with ductility loss in structural materials. We proposed a novel approach to the design and fabrication of hierarchically structured Al-Mg-Si alloys/nanocomposites with improved strength and ductility. The layered distribution of TiC nanoparticles (TiC p), bimodal-sized grains and precipitates were produced in a laminated composite composed of Al-Mg-Si matrix alloy and TiC p /Al-Mg-Si composite by accumulative roll bonding (ARB), increasing yield strength from 380 MPa to 443 MPa with a uniform elongation from 5.0% to 6.4%, compared to the ARB TiC p /Al-Mg-Si composite. This work provides a new strategy for producing high strength composite sheets for industrial applications. IMPACT STATEMENT A hierarchical structure with the layered distribution of nanosized TiC particles (TiC p) was obtained through the master alloy-casting process and accumulative roll bonding process. Significant improvement in strength was obtained with no loss in ductility.

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Back stress in strain hardening of carbon nanotube/aluminum composites

Cited by 81 publications

References 29 publications

Perspective on hetero-deformation induced (HDI) hardening and back stress

Perspective on hetero-deformation induced (HDI) hardening and back stress

Carbon Nanotube‐Reinforced Aluminum Matrix Composites

Simultaneously increased strength and ductility via the hierarchically heterogeneous structure of Al-Mg-Si alloys/nanocomposite

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