Novel cost-effective Fe-based high entropy alloys with balanced strength and ductility

Yin, Yu; Zhang, Jingqi; Tan, Qiyang; Zhuang, Wyman; Mo, Ning; Bermingham, Michael; Zhang, Mingxing

doi:10.1016/j.matdes.2018.11.033

Cited by 66 publications

(18 citation statements)

References 57 publications

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“…Based on the concept of non-equiatomic HEAs and EHEAs mentioned in section 2.2, Yin et al [58] have constructed a series of iron-based EHEAs with molybdenum and chromium as intermetallic forming elements, and nickel as FCC forming element [59]. Due to the high availability and low market cost of iron, it has been chosen to be the principal element for this EHEA with the aim to substantially reduce the cost.…”

Section: Fe-based Ehea Fe45ni25cr25mo5mentioning

confidence: 99%

UQ eSpace

Koey¹

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The strength of the Fe45Ni25Cr25Mo5 high-entropy alloy was reinforced through precipitation hardening and minor addition of titanium and carbon elements. The aged Fe45Ni25Cr25Mo5 alloy obtained a peak hardness of 307.12 HV at 900 ˚C for 48 hours. This alloy was strengthened through the formation of long thin needle-like ! phase precipitates. 5 at.% of titanium and carbon were added to the alloy respectively to further improve its strength and restrict the growth of the needle-like precipitates during aging treatment. The involvement of the reinforcement content induced the formation of (Ti, Mo, C)-rich carbides, and hence increased the hardness of the alloy to 246.45 HV. Aging treatment was performed in (Fe45Ni25Cr25Mo5)90Ti5C5 alloy to investigate the strength evolution of this alloy. The best aging performance was obtained when the alloy was aged at 800 ˚C for 96 hours with an optimum hardness of 402.24 HV. The minor elemental addition has refined the needle-like precipitates from the size larger than 20 µm to the size smaller than 10 µm. As a result, (Fe45Ni25Cr25Mo5)90Ti5C5 alloy was reinforced by the high volume fraction of fine needle-like precipitates and nanosized precipitates, fine divorced eutectic structures, as well as the (Ti, Mo, C)-rich carbides.

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Section: Fe-based Ehea Fe45ni25cr25mo5mentioning

confidence: 99%

UQ eSpace

Koey¹

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“…Many industries are currently looking of a new material that possess extensive mechanical properties at a lower price for structural applications such as aerospace engineering and civil transportation. These extensive mechanical properties such as high wear resistance, low temperature ductility, superparamagnetism, good corrosion resistance, high temperature oxidation resistance can easily be achieved with high entropy alloys [3].…”

Section: Price Of Equiatomic Heasmentioning

confidence: 99%

“…Table 2 summarized some of Fe-based high entropy alloys currently being developed and their mechanical properties [29]. [3]. The atomic ratio of the ferrous alloy Nickel is fixed at 25% to ensure the forming of FCC structure [3].…”

Section: Fe-based High Entropy Alloysmentioning

confidence: 99%

“…[3]. The atomic ratio of the ferrous alloy Nickel is fixed at 25% to ensure the forming of FCC structure [3]. In attempt to ensure the formation of a single FCC phase, previous work by Sheng Guo and co-workers [33] shows that the average pg.…”

Section: Fe-based High Entropy Alloysmentioning

confidence: 99%

“…There exists a research gap between conventional and high entropy alloys, due to its nature being equiatomic or near equiatomic, high entropy alloys lead to high cost which limits their industrial applications. A novel cost-effective non-equiatomic Fe-based high entropy alloys Fe45 Ni25Cr25 Mo5 is developed in 2018 by Yu Yin and co-workers [3]. This FCC-structured high entropy alloys possess an extreme ductility but limited strength.…”

Section: Introductionmentioning

confidence: 99%

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Candella¹

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I would like to express my gratitude to Professor Mingxing Zhang and Yu Yin, my research supervisor from The University of Queensland, for their continuous guidance during the course of my research. Their willingness to give time and their valuable constructive critiques on regular meetings have enabled me to finish my thesis I wish to acknowledge the help provided by fellow undergraduate researcher Kai En Koey and Zhihan Chen of the high-entropy alloy research group, and laboratory technicians of the Advanced Engineering Building UQ Finally, I would like to sincerely thank my father, my mother, my sister, and my friends for their continuous support during my time of study

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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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Novel cost-effective Fe-based high entropy alloys with balanced strength and ductility

Cited by 66 publications

References 57 publications

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

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