High strength and high ductility achieved in a heterogeneous lamella-structured magnesium alloy

Wang, Tong; Zha, Min; Du, Chunfeng; Jia, Hai-Long; Wang, Cheng; Guan, Kai; Gao, Yipeng; Wang, Huiyuan

doi:10.1080/21663831.2022.2133976

Cited by 85 publications

(3 citation statements)

References 40 publications

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“…However, the soft domain accommodates higher strain compared with the hard domain, causing the occurrence of strain partitioning [49]. The strain gradient will increase with the increase of strain partitioning, resulting in HDI hardening [50]. The HDI hardening helps to delay the necking in tensile deformation, thereby improving ductility [51].…”

Section: Effect Of Bimodal Structure On Deformation and Fracturementioning

confidence: 99%

In-Situ Study on the Tensile Deformation and Fracture Mechanism of a Bimodal-Structured Mg-Gd-Y Alloy

Ning,

Gao,

Zhou

et al. 2023

Materials

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The as-extruded (EX) Mg-Gd-Y alloy studied here exhibited a bimodal structure, composed of fine dynamic recrystallized (DRXed) grains with random orientations and longitudinal coarse hot-worked grains. The slip analysis showed the DRXed grains exhibited mainly basal slips, while the hot-worked grains exhibited mainly prismatic slips during the tensile deformation. The distribution of geometrically necessary dislocations (GNDs) showed that there was strain partitioning between the fine and coarse grain regions. The hetero-deformation induced (HDI) hardening occurred between the two domains. It improves the strength and strain hardening capability of the alloy, leading to good strength-ductility synergy. Microcracks tended to nucleate at the DRXed grain boundaries, as well as at the interface between the two domains. The calculation of geometric compatibility parameter (m’) indicated that strain incompatibility between the adjacent grains induced the crack nucleation. The toughening effect of the fine DRXed grains hindered the crack propagation. However, the major crack formed at the interface between the two domains propagated unstably, due to the high stress concentration and the large crack size, causing the final failure.

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Section: Effect Of Bimodal Structure On Deformation and Fracturementioning

confidence: 99%

In-Situ Study on the Tensile Deformation and Fracture Mechanism of a Bimodal-Structured Mg-Gd-Y Alloy

Ning,

Gao,

Zhou

et al. 2023

Materials

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“…The material exhibits a strength similar to UFG-Ti and a uniform elongation comparable to the original CG-Ti. In a similar manner, Wang et al [19] employed a hard plate rolling process þ573 K short-time annealing for 290 s to produce HLS-Mg alloy with both CG (≈8.9 μm) and fine-grained (≈1.6 μm) structures. The resulting HLS-Mg alloy exhibited improved strength and plasticity compared to CG-Mg alloy to DOI: 10.1002/srin.202300860 316L austenitic stainless steel (ASS) with a heterogeneous structure exhibits favorable mechanical properties at room temperature, promising excellent application potential.…”

Section: Introductionmentioning

confidence: 99%

Design of Heterogeneous Lamella Microstructure of 316L Austenitic Stainless Steel and Effect of Aging on Its Mechanical Behavior and Corrosion Properties

Liu,

Li,

Gao

et al. 2024

steel research int.

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316L austenitic stainless steel (ASS) with a heterogeneous structure exhibits favorable mechanical properties at room temperature, promising excellent application potential. However, the thermal stability of 316L ASS with heterogeneous lamella structure (HLS) has not been adequately addressed yet. Herein, an HLS of 316L ASS is fabricated through 78% cold rolling followed by annealing at 750 °C for 13 min. The detailed investigation focuses on the influence of microstructure evolution on the mechanical properties and corrosion resistance of the alloy after aging at temperatures ranging from 350 to 550 °C for 100 h. The results show that a notable quantity of residual martensite persists even after annealing at high temperatures for a brief duration. The dislocation density of the test steel is reduced after long‐term aging treatment, and the residual martensite is further reversed into austenite during aging. In addition, the aging treatment also promotes further growth of nanocrystalline/ultrafine‐grained, which weakens the heterogeneous characteristics of HLS 316L ASS, resulting in a slight decrease in mechanical properties. However, the decrease in defect density and the enhancement of recrystallization degree are beneficial for eliminating most of the corrosion‐sensitive areas in the cold‐deformed structure, thereby improving the corrosion resistance.

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“…In industry, over 80% of Mg components are made by high-pressure die casting [ 1 ], but casting brings defects such as porosity and shrinkage cavity [ 2 , 3 ]; these defects reduce the consistency of mechanical properties and limit the widespread use of Mg alloys. In contrast, the Mg alloy processed by rolling, extrusion, and forging can reduce casting defects, refine the structure and improve mechanical properties [ 4 , 5 , 6 , 7 ]. Some wrought Mg alloys made by rotary swaging have a strength of over 700 MPa [ 5 , 8 ], which shows the ample potential of Mg alloy for application.…”

Section: Introductionmentioning

confidence: 99%

Twinning Behavior, Microstructure Evolution and Mechanical Property of Random-Orientated ZK60 Mg Alloy Compressed at Room Temperature

Zhang

et al. 2023

Materials

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In this study, the uniaxial compression of random orientation ZK60 Mg alloy to different strains was performed at room temperature. The microstructure evolution was characterized mainly using electron backscattered diffraction (EBSD), and the mechanical property was evaluated by the Vickers hardness test. During compression, extension twins nucleated, grew, and engulfed the grain. Twins form a texture with the c-axis parallel to the compression direction. With the massive nucleation and expansion of extension twins during compression, the twin boundary (TB) brought the grain refinement, and the twin boundary-dislocation interaction significantly increased the strain hardening rate of ZK60 Mg alloy, both leading to its significantly increasement of the hardness.

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High strength and high ductility achieved in a heterogeneous lamella-structured magnesium alloy

Cited by 85 publications

References 40 publications

In-Situ Study on the Tensile Deformation and Fracture Mechanism of a Bimodal-Structured Mg-Gd-Y Alloy

In-Situ Study on the Tensile Deformation and Fracture Mechanism of a Bimodal-Structured Mg-Gd-Y Alloy

Design of Heterogeneous Lamella Microstructure of 316L Austenitic Stainless Steel and Effect of Aging on Its Mechanical Behavior and Corrosion Properties

Twinning Behavior, Microstructure Evolution and Mechanical Property of Random-Orientated ZK60 Mg Alloy Compressed at Room Temperature

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