Engineering heterostructured grains to enhance strength in a single-phase high-entropy alloy with maintained ductility

Fu, Zhiqiang; MacDonald, Benjamin E.; Li, Zhi Ming; Jiang, Zhenfei; Chen, Weiping; Zhou, Yizhang; Lavernia, Enrique J.

doi:10.1080/21663831.2018.1526222

Cited by 75 publications

(11 citation statements)

References 32 publications

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“…These heterostructured materials demonstrate a high potential for exhibiting excellent mechanical properties and functionalities. 47) Thus, this section describes two selected properties of tribological effects and specific strength of the mechanically-bonded AlFe system and of the MMNCs in the AlMg and AlCu systems. Small-scale sliding tests were conducted to evaluate the morphology or the wear scar, and thus to determine the type of wear behavior, under a load of 10.0 N and a sliding stroke of 2.0 mm at a sliding speed of 0.004 m s ¹1 for a total sliding distance of 20 m on the surfaces at the disk edges of the AlFe system after 20 turns of HPT as shown in Fig.…”

Section: Tribological and Mechanical Propertiesmentioning

confidence: 99%

Bulk-State Reactions and Improving the Mechanical Properties of Metals through High-Pressure Torsion

et al. 2019

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This report presents an overview of recent studies demonstrating a bulk-state reaction involving mechanical bonding through the application of high-pressure torsion (HPT) processing on two dissimilar engineering metals. This processing approach was developed by revising the sample setup and applying the simple procedure of alternately stacking two different metal disks using several different metal combinations. Thus, this report describes the development in microstructure after the bulk-state reactions and the mechanical properties of the HPT-induced AlMg, AlCu, AlFe and AlTi alloy systems. A microstructural evaluation confirmed the capability of the HPT procedure for the formation of heterostructures across the disk diameters in these processed alloy systems. Tribology tests and hardness values together with density measurements demonstrated an improved wear resistance and an exceptional specific strength in these alloy systems. The bulk-state reaction by HPT demonstrates a considerable potential for the bonding of dissimilar metals and the fabrication of unique metal systems.

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Section: Tribological and Mechanical Propertiesmentioning

confidence: 99%

Bulk-State Reactions and Improving the Mechanical Properties of Metals through High-Pressure Torsion

et al. 2019

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“…However, regardless of their intriguing core effects, HEAs also undergo this phenomenon, as shown in Section 3. Thus, many research efforts [215][216][217][218][219][220][221][222][223][224][225][226][227][228][229][230] have been made in terms of tuning the structure of HEAs to overcome this "strength-ductility trade-off," which will be surveyed in this section.…”

Section: Overcoming the "Strength-ductility Trade-off"mentioning

confidence: 99%

“…Another system which utilizes a heterogeneous structure to overcome the strength-ductility trade-off is the Fe 29 Co 28 Ni 29 Cu 7 Ti 7 HEA. [229] In groundbreaking research by Lei et al, [230] oxygen which usually renders materials brittle was used in the form of ordered oxygen complexes, a state in between oxide particles and random interstitials, to enhance the strength and ductility of HEAs. In their work, the structurally stable bcc-structured TiNbZrHf [40,41] HEA was used as a base alloy and then doped with oxygen and nitrogen, respectively, as ðTiNbZrHf Þ 98 O 2 and ðTiNbZrHf Þ 98 N 2 .…”

Section: Overcoming the "Strength-ductility Trade-off"mentioning

confidence: 99%

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Phase Selection, Lattice Distortions, and Mechanical Properties in High‐Entropy Alloys

et al. 2020

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Increasing demand for improved physical, chemical, and mechanical properties led to the development of conventional alloys from single elements. These conventional alloys are made by selecting one or two major elements with desired properties, and other minor components are added to tune the properties to meet performance specifications. The conventional alloy design strategy is mainly based on the "solutesolvent" principle. However, another alloy design strategy based on multiprincipal elements in the near-equimolar ratio has recently been developed. In this multiprincipal element system, it is difficult to distinguish between the solute and the solvent, and various atoms are supposed to be randomly distributed in the crystal lattices (which has not been confirmed yet). This strategy, proposed by Yeh [1] and Cantor, [2] was based on the Boltzmann hypothesis of the relationship between entropy and system complexity. They proposed that the increased configurational entropy of mixing in alloys with multiple alloying elements in near-equiatomic proportions would overcome the enthalpy of compound formation, stabilizing solid solutions (SS) at the expense of intermetallics (IMs) during solidification. These multiprincipal element alloys are named "high entropy alloys" (HEAs), although the exact values of entropy in HEAs have not been experimentally measured yet. Since then, hundreds of HEAs with different combinations have been developed based on transition metals, refractory metals, and compound forming elements. [2-20] Most of these HEAs have been found to possess simple crystal structures such as the face-centered cubic (fcc) Fe-Co-Cr-Mn-Ni HEAs, [2] bodycentered cubic (bcc) Al-Co-Cr-Fe-Ni HEAs, [18] and the hexagonal close-pack (hcp) Ho-Dy-Y-Gd-Tb HEAs [6] when solidified from the melts. Experimental characterization techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), differential scanning calorimetry (DSC), nanoindentation, tensile, wear-and corrosionresistance tests have been used to study the microstructureproperties correlations of HEAs. [3-50] These studies have revealed that HEAs possess superior properties, such as high hardness and strength, [23-29] superior corrosion and wear resistance, [3,30-35] good magnetic properties, [9,36-39,51] structural stability, [7,40,41] attractive mechanical properties at extreme temperature conditions, [21,42-47] and good electronic properties. [48,49] Yeh [50] proposed four core effects of HEAs, namely: 1) high-entropy effect; 2) sluggish diffusion effect; 3) sever lattice distortion effect; and 4) cocktail effect, in which the lattice distortion might be the key factor affecting the properties of HEAs. Although a complete understanding of lattice distortions in HEAs is still not established yet, significant progress in HEAs has been made recently.

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“…As a result, the tradeoff in strength and ductility can be largely alleviated. [11][12][13][14]18,19,[28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45] In this article, we focus on the trans-scale GS and HLS, containing the nanograins (NG)/nanostructures (NS) and coarse grains (CG). Both the GS and HLS induce hetero deformation, which produces extraordinary strain hardening.…”

Section: Introductionmentioning

confidence: 99%

Gradient and lamellar heterostructures for superior mechanical properties

Zhu

2021

MRS Bulletin

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Heterostructured (HS) materials are a novel class of materials with mechanical properties that are superior over their conventional homogeneous counterparts. They are composed of HS zones with a dramatic difference in mechanical behaviors, which produces a synergistic effect on mechanical properties that are above the prediction by the rule-of-mixtures. Among all heterostructures, the two most studied are grain-size gradient structure and heterolamellar structure. These two heterostructures produce typical heterogeneous deformation during tensile deformation, producing long-range back stress in the soft zones and forward stress in the hard zones, which collectively produces hetero deformation-induced (HDI) stress to enhance the yield strength before yielding, and HDI hardening after yielding to retain ductility. In this article, we will focus on these two types of heterostructures. The issues, concerns, and progress are reviewed with the emphasis on the synergistic effect of mechanical properties, the fundamentals of several special plastic behaviors (e.g., strain gradient, HDI hardening and strain hardening), the plastic deformation mechanism, and the relationship between the microstructure and properties.

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Engineering heterostructured grains to enhance strength in a single-phase high-entropy alloy with maintained ductility

Cited by 75 publications

References 32 publications

Bulk-State Reactions and Improving the Mechanical Properties of Metals through High-Pressure Torsion

Bulk-State Reactions and Improving the Mechanical Properties of Metals through High-Pressure Torsion

Phase Selection, Lattice Distortions, and Mechanical Properties in High‐Entropy Alloys

Gradient and lamellar heterostructures for superior mechanical properties

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