Dual-phase high-entropy alloys for high-temperature structural applications

Lim, Ka Ram; Lee, Kwang Seok; Lee, Jun Seo; Kim, Jin‐Yeon; Chang, Hye Jung; Na, Young Sang

doi:10.1016/j.jallcom.2017.09.089

Cited by 184 publications

(50 citation statements)

References 19 publications

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“…The hardness of the AlCrMoTi (#4) and AlCrMoTiV (#7) were 606 ± 11 and 556 ± 25 HV, respectively. These values are 17% and 7% higher than that of the AlCoCrFeNi HEA, which is representative of HEAs for intermediate temperature applications [9]. The theoretical densities are also lower than that of the AlCoCrFeNi HEA, so the specific hardnesses were 30% and 19% higher than that of the AlCoCrFeNi HEA.…”

Section: Specific Hardness Of the Al-ti-containing Heasmentioning

confidence: 79%

“…Recently, high-entropy alloys (HEAs) have attracted considerable attention because of their extraordinary properties [1][2][3][4][5][6][7][8][9][10], and numerous HEAs have been reported with various compositions [1][2][3][4][5][6][7][8][9][10]. Three major HEAs are CoCrFeMnNi alloy which has potential applications in cryogenic environments [5,6], refractory VNbMoTaW alloy for high-temperature structural applications [7,8], and AlCoCrFeNi alloy which maintains high strength up to intermediate temperatures [9,10].…”

Section: Introductionmentioning

confidence: 99%

“…Three major HEAs are CoCrFeMnNi alloy which has potential applications in cryogenic environments [5,6], refractory VNbMoTaW alloy for high-temperature structural applications [7,8], and AlCoCrFeNi alloy which maintains high strength up to intermediate temperatures [9,10]. AlCoCrFeNi HEA is relatively lightweight and has excellent specific strength around intermediate temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…AlCoCrFeNi HEA is relatively lightweight and has excellent specific strength around intermediate temperatures. It is a possible alternative for Ti alloys or wrought superalloys such as Inconel 718 [9,10]. Additional weight reduction can improve the competitiveness of the lightweight HEAs; therefore, we attempted to develop new HEAs that contain lightweight elements, namely Al and Ti.…”

Section: Introductionmentioning

confidence: 99%

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Al-Ti-Containing Lightweight High-Entropy Alloys for Intermediate Temperature Applications

Kang

Lim

Won

et al. 2018

Entropy

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Abstract:In this study, new high-entropy alloys (HEAs), which contain lightweight elements, namely Al and Ti, have been designed for intermediate temperature applications. Cr, Mo, and V were selected as the elements for the Al-Ti-containing HEAs by elemental screening using their binary phase diagrams. AlCrMoTi and AlCrMoTiV HEAs are confirmed as solid solutions with minor ordered B2 phases and have superb specific hardness when compared to that of commercial alloys. The present work demonstrates the desirable possibility for substitution of traditional materials that are applied at intermediate temperature to Al-Ti-containing lightweight HEAs.

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Section: Specific Hardness Of the Al-ti-containing Heasmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Al-Ti-Containing Lightweight High-Entropy Alloys for Intermediate Temperature Applications

Kang

Lim

Won

et al. 2018

Entropy

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“…Although exhibiting multifarious engineering applications, great efforts still be made on HEAs to pursue more excellent mechanical properties. The typical strengthening mechanisms such as precipitation-hardening [6][7][8], TWIP (twinning-induced plasticity) [9,10], TRIP (transformation-induced plasticity) [11,12], and dual-phase structure [13][14][15][16][17][18][19][20][21][22][23][24][25][26] was introduced in HEAs to achieve the good combination of high strength and large plasticity. Among these strengthening mechanisms, dual-phase structure was widely used and found being able to effectively achieve a balance of strength and plasticity by reasonably collocating the constituent phase.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and mechanical properties variation with Ni content in Al_0.8CoCr_0.6Fe_0.7Ni_x (x = 1.1, 1.5, 1.8, 2.0) eutectic high-entropy alloy system

Wang

Jin

2020

Mater. Res. Express

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Eutectic high-entropy alloys have drawn extensive attention because of their remarkable performance on the combination of strength and plasticity. In this study, a new Al 0.8 CoCr 0.6 Fe 0.7 Ni x (x=1.1, 1.5, 1.8, 2.0) eutectic high-entropy alloy system was designed; the microstructure and mechanical properties variation of alloys with the change in Ni content were investigated detailly. All of four alloys exhibited FCC+B2 dual-phase structure, while the volume fraction of FCC phase increased from 44% to 90% with an increase in Ni content. Meanwhile, the microstructure of alloys variated from an irregular dendrite morphology to a lamellar eutectic microstructure, and finally to a hypoeutectic microstructure composed by primary FCC phase and the rest eutectic mixture. Accordingly, the yield strength of alloys decreased from 625 MPa to 415 MPa, and the total elongation increased from 7.4% to 21.8%. The Al 0.8 CoCr 0.6 Fe 0.7 Ni 1.5 alloy displayed a nano-scale lamellar eutectic microstructure and exhibited a relatively good combination of strength and plasticity in these four alloys, with a yield strength of 490 MPa, a ultimate strength of 980 MPa and a total elongation of 14.8%. The findings could contribute to explore HEAs with good combination of strength and plasticity and promote the applications of high-entropy alloys in industrial fields.

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Strengthening Mechanisms in Bulk FeCoCrNiAl_x (x=0, 0.5, 1.0) High‐Entropy Alloys Fabricated by Laser Melting Deposition

2023

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Herein, FeCoCrNiAl x (x = 0, 0.5, 1.0) high‐entropy alloys (HEAs) are fabricated by the laser melting deposition (LMD) technique. With the increase of Al content, the LMD‐ed microstructure transitions from a single face‐centered cubic (FCC) phase to a dual‐phase structure containing a small amount of body‐centered cubic (BCC) phase (5.3%), and the proportion of the final BCC phase increases significantly to 98.2%. In addition to the compression tests, four strengthening models are used to evaluate the theoretical strength of the three alloys. The addition of Al element as grain refiner can improve the ultimate compressive strength of HEAs; however, the yield strength and plasticity do not improve, as theoretically expected. The FCC phase with more slip systems leads to higher plasticity in the LMD‐ed FeCoCrNi HEA but results in lower yield strength. The LMD‐ed FeCoCrNiAl0.5 HEA exhibits the best combination of strength and plasticity. Therefore, to meet the required service requirements, the content of Al in the FeCoCrNiAl x HEA should be carefully controlled under the premise of considering the actual working conditions.

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Dual-phase high-entropy alloys for high-temperature structural applications

Cited by 184 publications

References 19 publications

Al-Ti-Containing Lightweight High-Entropy Alloys for Intermediate Temperature Applications

Al-Ti-Containing Lightweight High-Entropy Alloys for Intermediate Temperature Applications

Microstructure and mechanical properties variation with Ni content in Al_0.8CoCr_0.6Fe_0.7Ni_x (x = 1.1, 1.5, 1.8, 2.0) eutectic high-entropy alloy system

Strengthening Mechanisms in Bulk FeCoCrNiAl_x (x=0, 0.5, 1.0) High‐Entropy Alloys Fabricated by Laser Melting Deposition

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Dual-phase high-entropy alloys for high-temperature structural applications

Cited by 184 publications

References 19 publications

Al-Ti-Containing Lightweight High-Entropy Alloys for Intermediate Temperature Applications

Al-Ti-Containing Lightweight High-Entropy Alloys for Intermediate Temperature Applications

Microstructure and mechanical properties variation with Ni content in Al0.8CoCr0.6Fe0.7Nix (x = 1.1, 1.5, 1.8, 2.0) eutectic high-entropy alloy system

Strengthening Mechanisms in Bulk FeCoCrNiAlx (x=0, 0.5, 1.0) High‐Entropy Alloys Fabricated by Laser Melting Deposition

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Microstructure and mechanical properties variation with Ni content in Al_0.8CoCr_0.6Fe_0.7Ni_x (x = 1.1, 1.5, 1.8, 2.0) eutectic high-entropy alloy system

Strengthening Mechanisms in Bulk FeCoCrNiAl_x (x=0, 0.5, 1.0) High‐Entropy Alloys Fabricated by Laser Melting Deposition