Microstructures and hardnesses of AlCoCr0.5FexNi2.5 high entropy alloys with equal valence electron concentration

Liu, Min; Xu, Weihua; Zhang, Shidong; Wang, Zemin; Wang, Zhanyong; Wang, Binjun; Wang, Duo; Li, Fangjie

doi:10.1016/j.jallcom.2020.153881

Cited by 24 publications

(5 citation statements)

References 15 publications

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“…The reason for this is that during laser cladding, Fe from the substrate enters the coating. [ 21–24 ]…”

Section: Results and Analysismentioning

confidence: 99%

“…The reason for this is that during laser cladding, Fe from the substrate enters the coating. [21][22][23][24] The SEM image of [Cr-Fe 4 Co 4 Ni 4 ]Cr 2.6Àx Ti x Mo 0.4 (x = 0, 0.3, 0.6, and 0.9) HEA coatings is shown in Figure 6a-d. All HEA coatings contain typical cellular and dendritic features, including cellular and intercellular regions.…”

Section: Microstructural Analysismentioning

confidence: 99%

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A Novel Compositional Design of [Cr–Fe₄Co₄Ni₄]Cr_2.6−xTi_xMo_0.4 High‐Entropy Alloy Coating Based on the Cluster‐Plus‐Glue‐Atom Model and Its Mechanism of Resisting Strong Acid Erosion

Ding

Wang

et al. 2023

Adv Eng Mater

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During phosphoric acid synthesis, the agitator blade tends to collide with phosphate rock in a high sulfuric acid environment. In addition, although the blade composed of 904L stainless steel is highly resistant to corrosion, its hardness is reduced, which causes the blade to fail sooner. Consequently, to lower production costs by extending the blade's service life, it is vital to discover appropriate materials that can accomplish both high wear and corrosion resistance.High-entropy alloys (HEAs), one of the most significant discoveries in the field of metallic materials in nearly two decades, have piqued the interest of engineers and scientists both at home and abroad. It outperforms standard alloys in several ways, including outstanding high-temperature structural stability, high hardness, exceptional corrosion resistance, and wear resistance. [1][2][3] To extend service life, HEAs could be utilized as an alternate material to replace the blade manufactured of 904L stainless steel.Because bulk HEA has microstructural segregation and the constituents of HEA are expensive (such as Cr, Mo, Co, and Ni), the production cost is considerable. To address the aforementioned problems, a coating must be employed. The HEA coating fabricated on cheap metallic materials has a homogeneous microstructure and is inexpensive. Furthermore, the laser cladding technique, as an appealing surface modification technology, has the specific characteristics of high-temperature heating and rapid cooling rate, which could refine grain and supersaturate solidification structure, as well as increase corrosion resistance and strength. [4] Therefore, it is critical to synthesize a HEA coating on a blade constructed of 904L stainless steel.CoCrFeNi-M HEAs, one of the hottest HEAs systems, are composed of 3d transition group elements and have very high strength, hardness, corrosion resistance, wear resistance, and so on. [5,6] To improve the mechanical properties of the coating, Feng He et al. added a small amount of Ti and/or Mo to the CoCrFeNi matrix. [7] Löbel et al. added Ti into the AlCoCrFeNi alloy and discovered that the hardness and wear resistance of the alloy rose dramatically, making it suitable for surface

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“…The reason for this is that during laser cladding, Fe from the substrate enters the coating. [ 21–24 ]…”

Section: Results and Analysismentioning

confidence: 99%

Section: Microstructural Analysismentioning

confidence: 99%

A Novel Compositional Design of [Cr–Fe₄Co₄Ni₄]Cr_2.6−xTi_xMo_0.4 High‐Entropy Alloy Coating Based on the Cluster‐Plus‐Glue‐Atom Model and Its Mechanism of Resisting Strong Acid Erosion

Ding

Wang

et al. 2023

Adv Eng Mater

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“…The phase structures for a series of Al‐containing HEAs with 3 d or 4 d transition elements were selected in this article. [ 10–30 ] Two electronic parameters, Md and Bo in Ni‐based alloy, [ 7 ] combining with VEC and δ parameters, were applied to reveal the phase stability. The calculated values of these parameters and phase constitutions for Al‐containing HEAs are shown in Table 1 .…”

Section: Methodsmentioning

confidence: 99%

“…The calculated values of these parameters and phase constitutions for Al‐containing HEAs are shown in Table 1 . According to our previous study [ 15 ] and another literature, [ 16 ] special attention was placed on a group of Al‐containing HEAs maintaining VEC values at the threshold level (8.00) of FCC stable zone. The equal‐VEC HEAs included FCC‐structured Al 0.2 CoCrFeNi and FCC + BCC‐structured AlCoCr 0.5 Fe x Ni 2.5 alloys.…”

Section: Methodsmentioning

confidence: 99%

A New Criterion for Prediction of Phase Stability in Al‐Containing High Entropy Alloys

Sha

Zeng

et al. 2020

Physica Status Solidi (b)

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The reliable phase formation rule is demanded for high entropy alloys’ (HEAs) design and property regulation. Previous studies reveal the significant roles of thermodynamic and geometrical parameters in predicting phase structures of HEAs, whereas an accurate criterion is still not available. Herein, taking the most extensively studied Al‐containing HEAs as research object, two alloying parameters, i.e., d‐orbital energy level (Md) and bond order (Bo), combining with valence electron concentration (VEC) and atomic size difference (δ), are introduced to explore the phase stability of Al‐containing HEAs. The results indicate that single FCC solid solution tends to form in the range of δ below 4.5%, ordered phases (such as B2 and intermetallics) are more likely to be produced when the Md value of the alloy is beyond 1.06, and the FCC + BCC dual‐phase structures are mainly concentrated in the region of δ > 4.5% and Md < 1.06. The Md–δ criterion provides a reliable criterion of phase stability and a good guidance in alloy design for Al‐containing HEAs.

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“…In addition to the atomic size difference, the valence electron concentration (VEC) as another empirical parameter will affect the phase stability of HEAs 26) which can be expressed by following equation (2):…”

Section: Effect Of the Vec On The Mechanical Propertiesmentioning

confidence: 99%

Effect of Aluminium Content on Microstrure and Mechanical Properties of AlxCoFe1.9Ni2.1 High Entropy Alloys

Niu

Zhao

et al. 2021

Mater. Trans.

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In this paper, Al x CoFe 1.9 Ni 2.1 (x = 0.5, 0.8, 1.0, 1.5) high entropy alloys are prepared by vacuum arc melting furnace. The effect of aluminum content on the microstructure and mechanical properties of Al x CoFe 1.9 Ni 2.1 high entropy alloys was studied. The microstructure of high entropy alloy was characterized by SEM, X-ray diffraction and EDS. The results show that with the increase of aluminum content, the microstructure varies from FCC to FCC+BCC structure and finally to single BCC structures. And when the aluminum content is 0.5, the microstructure exhibits slender dendritic structure, then turns to mixture of eutectic structure and FCC phase at x = 0.8 and x = 1.0. when x reaches 1.5, the microstructure changes into dendritic structure. With the increase of aluminum content, the yield strength increased from 172.3 MPa to 949.6 MPa, and the hardness increased from 127 HV to 479 HV, which significantly improved the strength and hardness of the alloy.

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Microstructures and hardnesses of AlCoCr0.5FexNi2.5 high entropy alloys with equal valence electron concentration

Cited by 24 publications

References 15 publications

A Novel Compositional Design of [Cr–Fe₄Co₄Ni₄]Cr_2.6−xTi_xMo_0.4 High‐Entropy Alloy Coating Based on the Cluster‐Plus‐Glue‐Atom Model and Its Mechanism of Resisting Strong Acid Erosion

A Novel Compositional Design of [Cr–Fe₄Co₄Ni₄]Cr_2.6−xTi_xMo_0.4 High‐Entropy Alloy Coating Based on the Cluster‐Plus‐Glue‐Atom Model and Its Mechanism of Resisting Strong Acid Erosion

A New Criterion for Prediction of Phase Stability in Al‐Containing High Entropy Alloys

Effect of Aluminium Content on Microstrure and Mechanical Properties of Al<sub>x</sub>CoFe<sub>1.9</sub>Ni<sub>2.1</sub> High Entropy Alloys

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Microstructures and hardnesses of AlCoCr0.5FexNi2.5 high entropy alloys with equal valence electron concentration

Cited by 24 publications

References 15 publications

A Novel Compositional Design of [Cr–Fe4Co4Ni4]Cr2.6−xTixMo0.4 High‐Entropy Alloy Coating Based on the Cluster‐Plus‐Glue‐Atom Model and Its Mechanism of Resisting Strong Acid Erosion

A Novel Compositional Design of [Cr–Fe4Co4Ni4]Cr2.6−xTixMo0.4 High‐Entropy Alloy Coating Based on the Cluster‐Plus‐Glue‐Atom Model and Its Mechanism of Resisting Strong Acid Erosion

A New Criterion for Prediction of Phase Stability in Al‐Containing High Entropy Alloys

Effect of Aluminium Content on Microstrure and Mechanical Properties of Al<sub>x</sub>CoFe<sub>1.9</sub>Ni<sub>2.1</sub> High Entropy Alloys

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A Novel Compositional Design of [Cr–Fe₄Co₄Ni₄]Cr_2.6−xTi_xMo_0.4 High‐Entropy Alloy Coating Based on the Cluster‐Plus‐Glue‐Atom Model and Its Mechanism of Resisting Strong Acid Erosion

A Novel Compositional Design of [Cr–Fe₄Co₄Ni₄]Cr_2.6−xTi_xMo_0.4 High‐Entropy Alloy Coating Based on the Cluster‐Plus‐Glue‐Atom Model and Its Mechanism of Resisting Strong Acid Erosion