Aging behavior of a CuCr2Fe2NiMn high-entropy alloy

Ren, Bo; Liu, Z.X.; Cai, Bin; Wang, M.X.; Shi, Lingling

doi:10.1016/j.matdes.2011.07.005

Cited by 110 publications

(39 citation statements)

References 20 publications

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“…Because of the very high mixing entropy, HEAs usually intend to form face center cubic (FCC) and/or body center cubic (BCC) disordered solid solutions (DSS) rather than intermetallic compounds or other complex ordered phases [8]. The particular structure makes multi-component HEAs exhibit excellent properties, such as high strength [7], high ductility [9,10], well magnetic properties [11], excellent resistances to wear, oxidation, irradiation and corrosion [5,12,13], and high thermal stability [14]. These properties provide HEAs with many potential applications such as tools, molds, diffusion barriers for integrated circuit (IC) and solar thermal collectors, etc., and a number of HEAs have been developed for both functional and structural applications.…”

Section: Introductionmentioning

confidence: 99%

Corrosion and Serration Behaviors of TiZr0.5NbCr0.5VxMoy High Entropy Alloys in Aqueous Environments

Yang

Zhu

et al. 2014

Metals

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Abstract:The corrosion and serration behaviors of TiZr0.5NbCr0.5, TiZr0.5NbCr0.5V and TiZr0.5NbCr0.5Mo high entropy alloys (HEAs) in NaCl and H2SO4 solutions were studied by potentiodynamic polarizations (PP) and immersion tests. The results show that all the alloys display excellent corrosion resistance no matter in NaCl solution or in H2SO4 solution. The additions of V and Mo increase the pitting corrosion resistance for the three alloys in NaCl solution slightly and greatly improve the corrosion resistance in H2SO4 solution. The corrosion behaviors of TiZr0.5NbCr0.5 and TiZr0.5NbCr0.5Mo alloys are more sensitive to temperature than that of TiZr0.5NbCr0.5V alloy. After immersion, the surface of TiZr0.5NbCr0.5 alloy appears some pitting holes, this may be related to the electrochemical noise and serration behavior on PP curves; localized corrosion initiates mainly on the boundaries of the BCC and Cr2Zr Laves phase for TiZr0.5NbCr0.5V alloy; while for the TiZr0.5NbCr0.5Mo alloy, the dendrites with Mo element rich region exhibit poor corrosion resistance. OPEN ACCESSMetals 2014, 4 598

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Section: Introductionmentioning

confidence: 99%

Corrosion and Serration Behaviors of TiZr0.5NbCr0.5VxMoy High Entropy Alloys in Aqueous Environments

Yang

Zhu

et al. 2014

Metals

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“…[9,10] However, recent studies show that the as-cast solution phases may transform to intermetallic phases when the alloys are aged at intermediate temperatures. [4,7,[11][12][13][14] Since high-temperature structural component is an important potential application of HEAs, the formation of intermetallic phases at intermediate temperatures and its effect to the properties of HEAs becomes a critical issue. In particular, the formation of sigma phase is frequently observed in aged HEAs.…”

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confidence: 99%

“…In particular, the formation of sigma phase is frequently observed in aged HEAs. [4,[11][12][13]15,16] Sigma phase is a very hard but brittle phase, so its formation leads to significant changes in mechanical properties. For example, the formation of a sigma phase matrix in Al 5 Cr 32 Fe 35 Ni 22 Ti 6 hardens the alloy to HV 950 but reduces the K IC to ∼5.…”

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confidence: 99%

“…The σ phase did not develop in aged Cr-and/or V-containing HEAs with VEC values outside of this range. It is also noted that VEC not only controls the presence of σ phase, but also affects To understand the efficacy of the VEC criterion, high-temperature phase-stability information of other HEAs is also collected from literatures (Table 2) [11][12][13][14][15][24][25][26][27] and summarized in Figure 3 (data points L1-L9). Alloys that already contain σ phase in their as-cast state are also included (L2, L4, L5, and L6).…”

mentioning

confidence: 99%

“…Indeed, Cu concentration in the dendrite area is only 1.8-5.5 at.%. [11] This factor is not considered in the calculation of VEC, so the effect of Cu is over-estimated. Unfortunately, Cu has a very high VEC of 11.…”

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confidence: 99%

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Criterion for Sigma Phase Formation in Cr- and V-Containing High-Entropy Alloys

Tsai

et al. 2013

Materials Research Letters

312

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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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Aging behavior of a CuCr2Fe2NiMn high-entropy alloy

Cited by 110 publications

References 20 publications

Corrosion and Serration Behaviors of TiZr0.5NbCr0.5VxMoy High Entropy Alloys in Aqueous Environments

Corrosion and Serration Behaviors of TiZr0.5NbCr0.5VxMoy High Entropy Alloys in Aqueous Environments

Criterion for Sigma Phase Formation in Cr- and V-Containing High-Entropy Alloys

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

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