A hierarchical nanolamella-structured alloy with excellent combinations of tensile properties

Li, Ming; Guo, Defeng; Ma, Tengyun; Shi, Yindong; Zhang, Guosheng; Zhang, Xiangyi

doi:10.1016/j.msea.2014.03.115

Cited by 13 publications

(8 citation statements)

References 15 publications

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“…The melted alloys were then flipped and remelted at least four times to achieve compositional homogeneity. Bone-shaped plate specimens with an original gauge length of 5 mm and the cross-sectional dimension of 2.2 mm Â 0.3 mm were prepared for the micro tensile tests [21,22]. Uniaxial tensile tests were performed on an Instron 5948 testing machine at a strain rate of 1 Â 10 À3 s À1 according to the ISO 6892-1:2009 [23].…”

Section: Methodsmentioning

confidence: 99%

Influence of beryllium addition on the microstructural evolution and mechanical properties of Zr alloys

Feng

Jiang

Zhou

et al. 2015

Materials & Design (1980-2015)

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Section: Methodsmentioning

confidence: 99%

Influence of beryllium addition on the microstructural evolution and mechanical properties of Zr alloys

Feng

Jiang

Zhou

et al. 2015

Materials & Design (1980-2015)

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“…Over the past years, a novel approach to microstructure design, known as hierarchical laminate structure, has shown to greatly improve strength and ductility of conventional materials simultaneously, such as Ti alloys and steels, through massive microstructure refinement . Typically, such materials with hierarchical laminate structures consist of a parent phase serving as soft matrix to improve ductility and a hard product phase impeding dislocation motion to strengthen the microstructure.…”

mentioning

confidence: 99%

Bidirectional Transformation Enables Hierarchical Nanolaminate Dual‐Phase High‐Entropy Alloys

et al. 2018

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conventional nanostructures, for instance with grain sizes below a critical value of ≈50 nm, can experience softening due to grain boundary sliding. [11,12] Over the past years, a novel approach to microstructure design, known as hierarchical laminate structure, has shown to greatly improve strength and ductility of conventional materials simultaneously, such as Ti alloys and steels, through massive microstructure refinement. [13][14][15][16] Typically, such materials with hierarchical laminate structures consist of a parent phase serving as soft matrix to improve ductility and a hard product phase impeding dislocation motion to strengthen the microstructure. Unfortunately, such heterogeneous materials with high local mechanical disparity among their constituting phases are often prone to internal damage initiation, thus limiting ductility to 3.8-15% for Ti alloys, [13,14] 20-33% for medium Mn steels, [17] and 23-33% for stainless steels. [16] Therefore, the mechanical properties of such hierarchical laminate materials need to be further improved to minimize the probability of internal damage and failure. Also, creating laminate structures in bulk materials often requires imposing complex processing methods, e.g., accumulative roll bonding. [18] Interestingly, a recently developed dual-phase high-entropy alloy (HEA) also exhibits a simultaneous increase of strength and ductility after grain refinement [19][20][21][22][23] as highlighted in Figure 1. The excellent strength-ductility combination of the novel dual-phase HEA has been reported to be related to the transformationinduced plasticity (TRIP) effect, i.e., the displacive phase transformation from the face-centered cubic (FCC γ) matrix into the hexagonal close-packed (HCP ε) phase upon deformation. [19,22] Depending on the magnitude of the stacking fault energy, different compositional variants of recently developed HEAs have shown deformation modes with planar dislocation slip, [24,25] twinning induced plasticity (TWIP), [26] or TRIP effect. [22] Here, we observe another state which is thermodynamically characterized by a similar stability of two co-existing phases (FCC γ and HCP ε). This means that the stacking fault energy of the FCC matrix must assume a near-zero yet positive value so that forward (γ → ε) and backward (ε → γ) transformations can be both triggered in the same material and loading state.We studied the deformation mechanisms in the dual-phase HEA (Fe 50 Mn 30 Co 10 Cr 10 , at%) in more detail via transmission electron microscopy (TEM) analysis and found that this novel TRIP-assisted HEA gradually develops a hierarchical Microstructural length-scale refinement is among the most efficient approaches to strengthen metallic materials. Conventional methods for refining microstructures generally involve grain size reduction via heavy cold working, compromising the material's ductility. Here, a fundamentally new approach that allows load-driven formation and permanent refinement of a hierarchical nanolaminate structure in a novel high-entropy allo...

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“…To overcome this problem, a hierarchical structure consisting of nanocrystalline (NG, o 100 nm), ultrafine (UFG, 100 nm-1 μm) and micrometresized grains (CG, 41 μm) has recently been demonstrated to be a significant route for improving the ductility of nanostructured metals [5][6][7][8][9]. Similar to nanocrystalline metals, conventional lamellar structures in Ti alloys are generally composed of singlemodal fine lamellae, which usually results in high strength but limited ductility [10][11]. Hence, a hierarchical laminated structure that consists of large primary α p grains and fine α lamellae (bimodal structure) or of lamellae with different sizes, e.g., in width with nanometre and sub-micrometre scales, has also recently been used to enhance the combination of mechanical properties of Ti alloys [10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…Similar to nanocrystalline metals, conventional lamellar structures in Ti alloys are generally composed of singlemodal fine lamellae, which usually results in high strength but limited ductility [10][11]. Hence, a hierarchical laminated structure that consists of large primary α p grains and fine α lamellae (bimodal structure) or of lamellae with different sizes, e.g., in width with nanometre and sub-micrometre scales, has also recently been used to enhance the combination of mechanical properties of Ti alloys [10][11][12][13][14][15][16]. However, a hierarchical structure with extremely fine ( $ 50-100 nm in length) and coarse α lamellae ( $1 μm in length) has been reported to result in a better combination of mechanical properties than that of a hierarchical structure consisting of primary α p grains and coarse α lamellae ( $1 μm in length) [15].…”

Section: Introductionmentioning

confidence: 99%

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A hierarchical and multiphase nanolaminated alloy with an excellent combination of tensile properties

Shi

Guo

et al. 2014

Materials Science and Engineering: A

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A hierarchical nanolamella-structured alloy with excellent combinations of tensile properties

Cited by 13 publications

References 15 publications

Influence of beryllium addition on the microstructural evolution and mechanical properties of Zr alloys

Influence of beryllium addition on the microstructural evolution and mechanical properties of Zr alloys

Bidirectional Transformation Enables Hierarchical Nanolaminate Dual‐Phase High‐Entropy Alloys

A hierarchical and multiphase nanolaminated alloy with an excellent combination of tensile properties

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