Evolution of the microstructure and mechanical properties of as-cast Al0.3CoCrFeNi high entropy alloys by adding Si content

Gu, Xianyu; Zhuang, Yanxin; Jia, Peng

doi:10.1016/j.msea.2022.142983

Cited by 28 publications

(5 citation statements)

References 48 publications

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“…Many researchers have studied and proved that the addition of Si element significantly alters the phase assemblages and enhances the alloy’s hardness, wear resistance, corrosion resistance, and oxidation resistance [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 ]. The FeCoNiCrSi x [ 11 ], Al 0.5 CoCrCuFeNiSi x [ 12 ], FeCoNiAlSi x [ 13 ], Al 0.3 CoCrFeNi [ 14 ], Fe 2.5 CoNiCu [ 15 ], and AlCoCuNi-based M/HEAs [ 16 ] undergo the transition from a closed-packed face-centered cubic (FCC) structure to a loose-packed body-centered cubic (BCC) structure with the increasing of Si content, thus leading to better hardness and wear resistance. As Si content increases, the, FeCoCrNiMoSi x [ 17 ], Co 0.2 CrAlNi [ 18 ], FeCrMnVSi x [ 19 ], and CoCrFeNiSi x [ 20 ] M/HEAs enhance the hardness and wear resistance through the introduction of Si-rich precipitation, such as Cr 3 Si, Si-Ni, and σ phase.…”

Section: Introductionmentioning

confidence: 99%

“…In previous work, we aimed to improve the combination of strength and ductility in the range of keeping the single FCC phase. Nevertheless, the increase in Si content usually influences the crystal structure to change the mechanical performance [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 ]. Therefore, now we focus on the transformation of the crystal structure and mechanical properties with increasing the Si content.…”

Section: Introductionmentioning

confidence: 99%

“…The systematic study of Si element on the microstructure and properties of CrCoNiSi x MEA is required in order to answer these questions. Furthermore, the Si element generally increases the wear properties of the alloy [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 ]; nevertheless, the wear properties and mechanisms of CrCoNiSi x MEA have not been studied.…”

Section: Introductionmentioning

confidence: 99%

“…Many researchers have studied and proved that the addition of Si element significantly alters the phase assemblages and enhances the alloy's hardness, wear resistance, corrosion resistance, and oxidation resistance [11][12][13][14][15][16][17][18][19][20][21][22]. The FeCoNiCrSi x [11], Al 0.5 CoCrCuFeNiSi x [12], FeCoNiAlSi x [13], Al 0.3 CoCrFeNi [14], Fe 2.5 CoNiCu [15], and AlCoCuNi-based M/HEAs [16] undergo the transition from a closed-packed face-centered cubic (FCC) structure to a loosepacked body-centered cubic (BCC) structure with the increasing of Si content, thus leading to better hardness and wear resistance. As Si content increases, the, FeCoCrNiMoSi x [17], Co 0.2 CrAlNi [18], FeCrMnVSi x [19], and CoCrFeNiSi x [20] M/HEAs enhance the hardness and wear resistance through the introduction of Si-rich precipitation, such as Cr 3 Si, Si-Ni, and σ phase.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Si Addition on the Microstructures, Phase Assemblages and Properties in CoCrNi Medium-Entropy Alloy

Chang,

Wang,

Mao

et al. 2024

Materials

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The effects of Si addition on the microstructures and properties of CoCrNi medium-entropy alloy (MEA) were systematically investigated. The CrCoNiSix MEA possesses a single face-centered cubic (FCC) phase when x is less than 0.3 and promotes solution strengthening, while the crystal structure shows a transition to the FCC+σ phase structure when x = 0.4 and the volume fraction of the σ phase increases with a microstructure evolution as the Si content increases. The Orowan mechanism from σ precipitation effectively enhances the strength, hardness, and stain hardening of CrCoNiSix MEA, which also exhibits superior hardness at high temperatures. Furthermore, a large amount of σ phase decreases the wear resistance because of the transformation of the main wear mechanism from abrasion wear for σ-free CrCoNiSix MEA to adhesion wear for σ-contained CrCoNiSix MEA. This work contributes to the understanding of the effect of Si addition on FCC structured alloys and provides guidance for the development of novel Si-doped alloys.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of Si Addition on the Microstructures, Phase Assemblages and Properties in CoCrNi Medium-Entropy Alloy

Chang,

Wang,

Mao

et al. 2024

Materials

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“…They elucidated that the ductility at room temperature increased with increasing the Cr content to 6 at.%, because the addition of Cr caused the complete deactivation of the environmental embrittlement. Gu et al [36] studied the effect of Si addition to the Al0.3 CoCrFeNi high-entropy alloy. They clarified that adding Si could increase the hardness and strength of alloys.…”

Section: Introductionmentioning

confidence: 99%

Phase Prediction, Microstructure and Mechanical Properties of Fe–Mn–Ni–Cr–Al–Si High Entropy Alloys

Mahmoud

Shaharoun

Gepreel

et al. 2022

Metals

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The selection of high-entropy alloys (HEAs), which are relatively lightweight and have unique mechanical properties, remains a substantial challenge. In this study, six new HEAs were designed from the relatively low-cost Fe–Mn–Ni–Cr–Al–Si system using Thermo-Calc software, and then manufactured using a casting process. The effects of the atomic ratio of the alloying elements on the microstructures and mechanical properties of these alloys in the as-cast condition were systematically investigated. Brittle body-centered cubic BCC/B2 and silicide phases were found in relatively large amounts in the form of dendritic structure within large equiaxed grains with fine needle-shaped phases in the Fe30Mn15Ni20Cr15Al10Si10 and Fe35Mn15Ni20Cr15Al10Si5 alloys, in addition to the face-centered cubic (FCC) phase. When the contents of Mn and Ni were increased in the Fe35Mn25Ni15Cr15Al5Si5 and Fe35Mn20Ni20Cr15Al5Si5 alloys, the amounts of brittle phases were reduced; however, the ductile FCC phase is not significant. The FCC phase amount, which appeared as a honeycombed structure, was more than enough when the Si content was decreased to 3%. Broad relationships between the chemical composition of the alloys, especially the Si content, and the hardness and compression properties’ measurements were established. As the Si content decreased, both the hardness and compression properties of the resulting alloy also decreased. The experimental observation of the six HEAs matched the equilibrium phases predicted by the Thermo-Calc calculations.

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Effect of Si alloying on the structural, thermal expansion, and magnetic properties of FeCoNiAlSix high-entropy alloys

Nagarjuna,

Dewangan,

Lee

et al. 2024

J Mater Sci

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Evolution of the microstructure and mechanical properties of as-cast Al0.3CoCrFeNi high entropy alloys by adding Si content

Cited by 28 publications

References 48 publications

Influence of Si Addition on the Microstructures, Phase Assemblages and Properties in CoCrNi Medium-Entropy Alloy

Influence of Si Addition on the Microstructures, Phase Assemblages and Properties in CoCrNi Medium-Entropy Alloy

Phase Prediction, Microstructure and Mechanical Properties of Fe–Mn–Ni–Cr–Al–Si High Entropy Alloys

Effect of Si alloying on the structural, thermal expansion, and magnetic properties of FeCoNiAlSix high-entropy alloys

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