Extraordinary room temperature tensile ductility of laminated Ti/Al composite: Roles of anisotropy and strain rate sensitivity

Chen, Wenhuan; He, Weijun; Jiang, Bin; Qing, Liu

doi:10.1016/j.ijplas.2020.102806

Cited by 61 publications

(10 citation statements)

References 80 publications

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“…Recently, it was reported that the ductility of materials can be enhanced by the introduction of layered structure or gradient structure. [16][17][18][19][20] To reduce the usage of RE elements and further improve the property of Mg alloys, RE-containing and RE-free Mg alloys may be combined together, for example, through laminating. However, only a few works on Mg/Mg layered composites are available in the literature.…”

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confidence: 99%

Study on the Fine Grain Size and Microhardness at the Interface of AZ31/Mg‐Y Composites

Xian

Chen

et al. 2021

Adv Eng Mater

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AZ31/Mg‐Y/AZ31 composites are fabricated by hot rolling bonding. To identify the formation mechanism of the microstructure in the interface adjacent region, additional hot rolling or/and diffusion annealing are also conducted on the base of the initial AZ31/Mg‐Y/AZ31 composite. Scanning electron microscopy, energy dispersive spectroscopy, and electron backscatter diffraction are used to characterize the microstructures and chemical compositional distributions. Vicker's microhardness tests are conducted to determine the local mechanical property. It is found that in the Mg–Y layer of the AZ31/Mg‐Y/AZ31 composite, the grain size in the interface‐adjacent region is much finer than that in the central part. Much finer Al2Y particles compared with those in the traditional Mg–Al–Y alloys are formed in the interface‐adjacent region. The formation of the fine grain in the interface‐adjacent region may be mainly related to the Al2Y particles rather than the accommodation deformation between layers. Both the grain refinement and the formation of Al2Y particles contribute to strengthening of the Mg–Y layer. The results in this work may provide a novel method to prepare fine and dispersed high‐melting‐point particles in Mg alloys, thus leading to strong and high‐thermal‐stability Mg alloys.

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confidence: 99%

Study on the Fine Grain Size and Microhardness at the Interface of AZ31/Mg‐Y Composites

Xian

Chen

et al. 2021

Adv Eng Mater

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“…In addition, many investigations found that inhomogeneous microstructure may provide extra strengthening and work hardening capability in other metallic materials. [ 39,40 ] However, much further work need be done to verify the LNT‐rolling‐induced synergistic strengthening and toughening and reveal the underlying mechanisms.…”

Section: Resultsmentioning

confidence: 99%

Microstructures and Mechanical Properties of a Commercial Pure Zirconium during Rolling and Annealing at Different Temperatures

Chen

et al. 2020

Adv Eng Mater

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Zirconium (Zr) alloys have been widely applied in nuclear reactors due to their low probability of neutron capture, acceptable mechanical properties, and excellent corrosion resistance. [1-6] Zirconium alloys are commonly used as cladding tubes, fixed grids, or channel box in reactors. [2,3,6] The fabrication of Zr alloys components generally includes vacuum consumable melting, forging, extrusion, hot and cold rolling, recrystallization or stress relief annealing and so on. [7] Rolling and subsequent annealing are frequently used in the Zr alloy sheet and tube production, which actually determine the microstructure and texture, [7-10] thus playing a decisive role for the corrosion resistance, [11-14] creep resistance [15-17] and mechanical properties [18-20] of Zr alloys. Annealing can reduce the residual stress, recover the plastic deformation ability and tailor the grain size and texture, which plays a vital role in the Zr alloy fabrication. A special parameter was thus proposed to evaluate the effect of annealing. [21] The microstructure and the texture evolution during annealing are not only significantly affected by annealing condition, for example temperature [22,23] and holding time, [8,24] but also by the pre-annealing deformation. [6,25] Indeed, many research results on deformation and subsequent annealing in Zr alloys have been reported. Chen et al. [7] reported that the 30% rolling reduction combined with annealing at 580 C for 12 h imparted a superior plasticity to the Zr alloy. Kumara et al. [26] investigated the three stage of annealing in a moderately deformed Zr-4 alloy. They found that the changes in the misorientations, and corresponding rearrangements of dislocations, were the most efficient means of stress relief in Zr-4 alloy. Prakash et al. [27] investigated the microstructural and textural evolution of ZIRLO alloy during hot rolling at different temperatures. Their results show that the slip, twinning, and recrystallization played a role in the microstructure development during hot rolling. They also contributed to the texture development, lamellae break-up, and the formation of a bimodal microstructure. Jiang et al. [28] studied the effects of cold-rolling reduction, annealing temperature, and time on recrystallization behavior and kinetics of cold-rolled Zr-1Sn-0.3Nb-0.3Fe-0.1Cr alloy and found that the rate of the recrystallization increased with increasing annealing temperature and rolling reduction. Recrystallized grains nucleated preferentially at sites with high-density dislocation and deformation stored energy. Zhang et al. [29] studied the microstructure evolution and mechanical properties of Zr 98.2 Cr 1.8 during hot rolling, solution and aging treatment (STA). It was found the bimodal microstructure was the key factor to achieve high strength (ultimate tensile strength 818 MPa) and excellent ductility (18.4%) after STA at 750 C. Gerspach et al. [30] investigated the texture stability during primary recrystallization of cold-rolled Zr702 alloy and found that a small strain favored...

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“…According to the rule of mixing (ROM), yield strength, tensile strength, and uniform elongation were predicted for HLS-b and HLS-c. The ROM calculation formula is as follows [31]:…”

Section: Discussionmentioning

confidence: 99%

Mechanical properties optimization and microstructure analysis of pure copper gradient laminates via rolling

Gao

Wang

Zhao

et al. 2022

Preprint

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Heterostructured (HS) material with extraordinary mechanical properties has been regarded as one of the most promising structural materials. In this paper, heterogeneous lamella structure (HLS) Cu laminates composed of surface elongated-grain layer and center equiaxed-grain layer were fabricated via rolling bonding and annealing. In order to study the interface effect on mechanical properties of gradient structured materials，both the laminate metal composite (LMC) and the non-composite laminate (NCL) were fabricated by cold-rolling pretreatment of the center layer (60% reduction) and cold-rolling bonding of the whole blank (67% reduction). Then by controlling the post-annealing regimes, the HLS was obtained and the microstructure of each layer was optimized, and a larger degree of microstructure heterogeneities such as grain size, misorientation angle and grain orientation were obtained, which resulted in obvious mechanical differences. Tensile tests of HLS, surface layer, center layer and NCL specimens reveal that the HLS annealed at 300°C/1h has a significantly higher strength than the center layer and a higher elongation than the surface layer. The HLS have a tensile strength and elongation at fracture of 278.08 MPa and 46.2%, respectively, which shows good balance of strength and plasticity. The main reason for the improved properties is the strengthening or strain hardening generated by the inhomogeneous deformation of the heterogeneous layers in the laminate and the mutual constraint acquired by the distinct layers with strong mechanical differences. The HLS has an interfacial bonding strength of 178.5 MPa, which plays a vital role in the coordinated deformation of heterogeneous layers. The method of obtaining gradients in homogeneous materials proposed in this study provides a new way of thinking and enriches the theoretical basis for the comprehensive performance improvement of traditional metallic materials.

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Extraordinary room temperature tensile ductility of laminated Ti/Al composite: Roles of anisotropy and strain rate sensitivity

Cited by 61 publications

References 80 publications

Study on the Fine Grain Size and Microhardness at the Interface of AZ31/Mg‐Y Composites

Study on the Fine Grain Size and Microhardness at the Interface of AZ31/Mg‐Y Composites

Microstructures and Mechanical Properties of a Commercial Pure Zirconium during Rolling and Annealing at Different Temperatures

Mechanical properties optimization and microstructure analysis of pure copper gradient laminates via rolling

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