Microstructures and compressive properties of multicomponent AlCoCrCuFeNiMox alloys

Zhu, Jingxian; Zhang, H.F.; Fu, Hengzhi; Wang, A.M.; Li, H.; Hu, Z. Q.

doi:10.1016/j.jallcom.2010.03.074

Cited by 118 publications

(28 citation statements)

References 11 publications

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“…Metals 2017, 7, 162 2 of 10 Cantor et al were the first to develop a single fcc phase alloy system consisting of different transition metals [1]. Further mentioned phases include bcc, hexagonal closed packed (hcp), and mixed solid solution structures, as well as different intermetallic phases.…”

Section: Introductionmentioning

confidence: 99%

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The Phase Composition and Microstructure of AlxCoCrFeNiTi Alloys for the Development of High-Entropy Alloy Systems

Lindner

Löbel

Mehner

et al. 2017

Metals

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Abstract:Alloying aluminum offers the possibility of creating low-density high-entropy alloys (HEAs). Several studies that focus on the system AlCoCrFeNiTi differ in their phase determination. The effect of aluminum on the phase composition and microstructure of the compositionally complex alloy (CCA) system Al x CoCrFeNiTi was studied with variation in aluminum content (molar ratios x = 0.2, 0.8, and 1.5). The chemical composition and elemental segregation was measured for the different domains in the microstructure. The crystal structure was determined using X-ray diffraction (XRD) analysis. To identify the spatial distribution of the phases found with XRD, phase mapping with associated orientation distribution was performed using electron backscatter diffraction. This made it possible to correlate the chemical and structural conditions of the phases. The phase formation strongly depends on the aluminum content. Two different body-centered cubic (bcc) phases were found. Texture analysis proved the presence of a face-centered cubic (fcc) phase for all aluminum amounts. The hard η-(Ni, Co) 3 Ti phase in the x = 0.2 alloy was detected via metallographic investigation and confirmed via electron backscatter diffraction. Additionally, a centered cluster (cc) with the A12 structure type was detected in the x = 0.2 and 0.8 alloys. The correlation of structural and chemical properties as well as microstructure formation contribute to a better understanding of the alloying effects concerning the aluminum content in CCAs. Especially in the context of current developments in lightweight high-entropy alloys (HEAs), the presented results provide an approach to the development of new alloy systems.

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Section: Introductionmentioning

confidence: 99%

“…The AlCoCrCuFeNi system and the copper-free AlCoCrFeNi system are the most studied HEA systems [5][6][7]. Based on these alloy systems, different modifications have been investigated [8][9][10][11]. Hume-Rothery et al [12] pointed out a tendency for a definite crystal structure at a particular electron concentration.…”

Section: Introductionmentioning

confidence: 99%

The Phase Composition and Microstructure of AlxCoCrFeNiTi Alloys for the Development of High-Entropy Alloy Systems

Lindner

Löbel

Mehner

et al. 2017

Metals

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“…According to the methods reported by Morinaga [47][48][49][50], the value of the parameter Md was calculated for the reported HEA system that contained TCP phases. The values are shown in Table 1 [5,6,34,[36][37][38]39,42,43,[53][54][55][56][57][58][59][60][61][62][63][64][65]. It was found that all the HEAs in Table 1 were synthesized by arc melting and then solidified in a water-cooled copper hearth.…”

Section: Resultsmentioning

confidence: 99%

“…Usually, some alloying elements, such as Al, B, Cr, Mo, Nb, Si, Ti, V, are added to HEAs that contain Co, Fe and Ni, forming alloy systems such as Al0.5CoCrCuFeNiTix [34], Al0.5CoCrCuFeNiBx [35], Al0.5CoCrCuFeNiVx [36], AlCoCrFeNiMox [37], AlCoCrCuFeNiMox [38], AlCoCrFeNiTix [6], AlCoCrFeNiNbx [39], AlCoCrFeNiSix [40], and AlCoCrFeNiTi0.5 [41]. It is worth noting that when the concentrations of Al, B, Cr, Mo, Nb, Si, Ti, and V exceed a critical value, some ordered phases might form, which could deteriorate the plasticity of the HEAs.…”

Section: Introductionmentioning

confidence: 99%

A Criterion for Topological Close-Packed Phase Formation in High Entropy Alloys

Dong

Jiang

et al. 2015

Entropy

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Abstract:The stability of topological close-packed (TCP) phases were found to be well related to the average value of the d-orbital energy level ( Md ) for most reported high entropy alloys (HEAs). Excluding some HEAs that contain high levels of the elements aluminum and vanadium, the results of this study indicated that the TCP phases form at Md > 1.09. This criterion, as a semi-empirical method, can play a key role in designing and preparing HEAs with high amounts of transitional elements.

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“…Previous work suggested that phase selection in multicomponent alloy systems might be related to fundamental properties of the constituent elements. [10][11][12][13][14] Several criteria for predicting phase formation in HEAs were proposed based on the standpoint of atomic radius (size factor), electronegativity (chemical affinity factor), and valence electron concentration (valence electron factor [VEC]). For example, a criterion using two parameters DH mix (enthalpy of mixing) and d (atomic radius difference) to characterize the stabilization of solid-solution phases was proposed by Zhang et al, and the details about how to calculate them can be found in Reference 15.…”

Section: Introductionmentioning

confidence: 99%

The Phase Competition and Stability of High-Entropy Alloys

Liu

et al. 2014

JOM

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Phase competition and stability of several typical high-entropy alloys (HEAs) were studied, and the effects of alloying additions and processing conditions on phase formation in these alloys were discussed. Alloying with chemically incompatible elements having a large difference in either the atomic size or enthalpy of mixing with constituting components in HEAs, e.g., Cu and Al in the FeCoNiCr alloy system, inevitably induced phase separation and stimulated formation of duplex solid-solution phases and even intermetallic compounds. The solid-solution phase in the as-cast FeCoNiCrMn HEA is extremely stable due to the good chemical compatibility among constituent components, but in the FeCoNiCrAl and (FeCoNiCrAl) 99 Si 1 HEAs with the incompatible elements Al and Si, pretreatment and annealing processes could induce phase transitions and the formation of new phases, indicating that the as-cast solid-solution phases were destabilized by quenched-in chemical segregation, resulting from additions of the dissimilar elements.

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Microstructures and compressive properties of multicomponent AlCoCrCuFeNiMox alloys

Cited by 118 publications

References 11 publications

The Phase Composition and Microstructure of AlxCoCrFeNiTi Alloys for the Development of High-Entropy Alloy Systems

The Phase Composition and Microstructure of AlxCoCrFeNiTi Alloys for the Development of High-Entropy Alloy Systems

A Criterion for Topological Close-Packed Phase Formation in High Entropy Alloys

The Phase Competition and Stability of High-Entropy Alloys

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