Strong yet ductile nanolamellar high-entropy alloys by additive manufacturing

Ren, Jie; Zhang, Yin; Zhao, Dexin; Chen, Yan; Guan, Shuai; Liu, Yanfang; Liu, Liang; Peng, Siyuan; Kong, Fanyue; Poplawsky, Jonathan D.; Gao, Guanhui; Voisin, Thomas; An, Ke; Wang, Y. Morris; Xie, Kelvin; Zhu, Ting; Chen, Wen

doi:10.1038/s41586-022-04914-8

Cited by 337 publications

(92 citation statements)

References 52 publications

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“…Laser additive manufacturing (LAM) has shown great promise towards that end. Previously LAM has been used to produce alloys with improved properties compared to their conventionally manufactured counterparts [36,[152][153][154][155][156][157][158][159] . Two main types of LAM are used in combinatorial studies, i.e., laser directed energy deposition (DED), also known as laser engineered net shaping (LENS), and laser powderbed fusion (L-PBF) [160] .…”

Section: Combinatorial Additive Manufacturing To Explore Large Compos...mentioning

confidence: 99%

A review on high-throughput development of high-entropy alloys by combinatorial methods

Mooraj¹,

Chen²

2023

J Mater Inf

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High-entropy alloys (HEAs) are an emerging class of alloys with multi-principal elements that greatly expands the compositional space for advanced alloy design. Besides chemistry, processing history can also affect the phase and microstructure formation in HEAs. The number of possible alloy compositions and processing paths gives rise to enormous material design space, which makes it challenging to explore by traditional trial-and-error approaches. This review highlights the progress in combinatorial high-throughput studies towards rapid prediction, manufacturing, and characterization of promising HEA compositions. This review begins with an introduction to HEAs and their unique properties. Then, this review describes high-throughput computational methods such as machine learning that can predict desired alloy compositions from hundreds or even thousands of candidates. The next section of this review presents advances in combinatorial synthesis of material libraries by additive manufacturing for efficient development of high-performance HEAs at bulk scale. The final section of this review discusses the high-throughput characterization techniques that are used to accelerate the material property measurements for systematic understanding of the composition-processing-structure-property relationships in combinatorial HEA libraries.

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Section: Combinatorial Additive Manufacturing To Explore Large Compos...mentioning

confidence: 99%

A review on high-throughput development of high-entropy alloys by combinatorial methods

Mooraj¹,

Chen²

2023

J Mater Inf

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“…The soft L1 2 phases will start plastic deformation first in 18Al and 19Al EHEAs, while the soft L1 2 phases will not be able to deform flexibly because of the deformation limit imposed by the remaining elastic B2 phases [15] . Additionally, due to the wider BCC lamellae, more geometrically necessary dislocations (GNDs) were prevented and piled up at FCC/BCC boundaries of 19Al in this deformation stage, resulting in larger long-range back stress in L1 2 phases [37][38][39] . The GNDs piled up at the FCC/BCC boundaries also generated forward stress in the B2 phases [37] , promoting the plastic deformation of the B2 phases.…”

Section: Resultsmentioning

confidence: 99%

Novel casting CoCrNiAl eutectic high entropy alloys with high strength and good ductility

2023

Microstructures

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Eutectic high-entropy alloys (EHEAs) have drawn increasing interest due to their fine castability as well as appealing properties in recent years. In this work, two bulk-casting Co 20-x/3 Cr 20-x/3 Ni 50-x/3 Al 10+x (x = 8 and 9) EHEAs with regular L1 2 /B2 lamellar morphologies were successfully fabricated and studied. Both EHEAs show high ultimate strength of ~1200 MPa combined with good uniform ductility (> 9%). Post-deformation transmission electron microscopy results indicated a high density of dislocations and stacking faults in the L1 2 lamellae, while no obvious dislocation in the B2 phases. This work can broaden the optimization of composition design in EHEAs and provide useful guidance for further development of CoCrNiAl EHEAs.

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“…High‐entropy alloys (HEAs) are a promising class of materials for structural applications 1–6 . The design and development of single‐phase HEAs received the majority of attention in the early stages of research.…”

Section: Introductionmentioning

confidence: 99%

“…High-entropy alloys (HEAs) are a promising class of materials for structural applications. [1][2][3][4][5][6] The design and development of single-phase HEAs received the majority of attention in the early stages of research. The tensile yield strength of face-centered cubic (FCC) HEAs is, however, frequently inadequate.…”

Section: Introductionmentioning

confidence: 99%

Microstructural evolution and mechanical characterization for the AlCoCrFeNi_2.1 eutectic high‐entropy alloy under different temperatures

Zhou

Liu

et al. 2023

Fatigue Fract Eng Mat Struct

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Recently, there has been a lot of interest in the AlCoCrFeNi2.1 eutectic high‐entropy alloys (EHEAs), which can achieve a good balance of strength and ductility. The relationship between the microstructure and mechanical properties of the alloy was established in this study by examining the microstructural evolution during heat treatment of 500–1000°C. The results show that the alloy's microstructure remained unchanged when the heat treatment temperature was lower than 700°C. With further rise above 800°C, the B2II precipitates were inspected in the L12 matrix. Besides, L12II started to be precipitated from the B2 matrix at 900°C. The tensile test results conducted at 20–1000°C showed that both the yield strength and ultimate tensile strength decreased as the temperature rose. As for the elongation, however, it increased dramatically when the testing temperature was over 800°C, being attributed to the dynamic recrystallization. The results obtained provided a fundamental understanding of high‐temperature properties for duplex HEAs.

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Strong yet ductile nanolamellar high-entropy alloys by additive manufacturing

Cited by 337 publications

References 52 publications

A review on high-throughput development of high-entropy alloys by combinatorial methods

A review on high-throughput development of high-entropy alloys by combinatorial methods

Novel casting CoCrNiAl eutectic high entropy alloys with high strength and good ductility

Microstructural evolution and mechanical characterization for the AlCoCrFeNi_2.1 eutectic high‐entropy alloy under different temperatures

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Strong yet ductile nanolamellar high-entropy alloys by additive manufacturing

Cited by 337 publications

References 52 publications

A review on high-throughput development of high-entropy alloys by combinatorial methods

A review on high-throughput development of high-entropy alloys by combinatorial methods

Novel casting CoCrNiAl eutectic high entropy alloys with high strength and good ductility

Microstructural evolution and mechanical characterization for the AlCoCrFeNi2.1 eutectic high‐entropy alloy under different temperatures

Contact Info

Product

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Microstructural evolution and mechanical characterization for the AlCoCrFeNi_2.1 eutectic high‐entropy alloy under different temperatures