Tensile deformation behavior and mechanical properties of a bulk cast Al0.9CoFeNi2 eutectic high-entropy alloy

Published on Jan 20, 2021in Journal of Materials Science & Technology8.067
· DOI :10.1016/J.JMST.2020.05.053
Hui Jiang16
Estimated H-index: 16
,
Dongxu Qiao7
Estimated H-index: 7
+ 3 AuthorsPeter K. Liaw97
Estimated H-index: 97
Sources
Abstract
Abstract In this study, a new Al0.9CoFeNi2 eutectic high entropy alloy (EHEA) was designed, and the microstructures as well as the deformation behavior were investigated. The bulk cast Al0.9CoFeNi2 EHEA exhibited an order face-centered cubic FCC (L12) and an order body-centered cubic (B2) dual-phase lamellar eutectic microstructure. The volume fractions of FCC (L12) and B2 phases are measured to be 60 % and 40 %, respectively. The combination of the soft and ductile FCC (L12) phase together with the hard B2 phase resulted in superior strength of 1005 MPa and ductility as high as 6.2 % in tension at room temperature. The Al0.9CoFeNi2 EHEA exhibited obvious three-stage work hardening characteristics and high work-hardening ability. The evolving dislocation substructures during uniaxial tensile deformation found that planar slip dominates in both FCC (L12) and B2 phases, and the FCC (L12) phase is easier to deform than the B2 phase. The post-deformation transmission electron microscopy revealed that the sub-structural evolution of the FCC (L12) phase is from planar dislocations to bending dislocations, high-density dislocations, dislocation network, and then to dislocation walls, and Taylor lattices, while the sub-structural evolution of the B2 phase is from a very small number of short dislocations to a number of planar dislocations. Moreover, obvious ductile fracture in the FCC (L12) phase and a brittle-like fracture in the B2 phase were observed on the fracture surface of the Al0.9CoFeNi2 EHEA. The research results provide some insight into the microstructure-property relationship.
📖 Papers frequently viewed together
8 Authors (Xuzhou Gao, ..., Yonghao Zhao)
References23
Newest
#1Qingfeng Wu (NPU: Northwestern Polytechnical University)H-Index: 26
#2Zhijun Wang (NPU: Northwestern Polytechnical University)H-Index: 29
Last. Jincheng Wang (NPU: Northwestern Polytechnical University)H-Index: 29
view all 8 authors...
Abstract Mechanical properties of casting alloys are generally limited. To make casting alloys applicable for a high level of service environments, a novel casting eutectic high entropy alloy (EHEA) with excellent mechanical properties is proposed. The hierarchical microstructures are with fine regular lamellar eutectic and coarse irregular eutectic. The eutectics consists of face-centered cubic (FCC) and ordered body-centered cubic (B2) phases with the semi-coherent interface. In the as-cast st...
Source
#1Zezhou Li (UCSD: University of California, San Diego)H-Index: 11
#2Shiteng Zhao (LBNL: Lawrence Berkeley National Laboratory)H-Index: 19
Last. Marc A. Meyers (UCSD: University of California, San Diego)H-Index: 97
view all 4 authors...
Abstract High-entropy alloys (HEAs), also known as multi-principal element alloys or multi-component alloys, have been the subject of numerous investigations since they were first described in 2004. The earliest HEA was the equiatomic CrMnFeCoNi “Cantor” alloy, but HEAs now encompass a broad class of metallic and ceramic systems. The concept of utilizing the high entropy of mixing to develop stable multi-element alloys may not be scientifically correct but has produced extraordinary mechanical p...
Source
#1Hui Jiang (DUT: Dalian University of Technology)H-Index: 16
#2Dongxu Qiao (DUT: Dalian University of Technology)H-Index: 7
Last. Tingju Li (DUT: Dalian University of Technology)H-Index: 26
view all 7 authors...
Abstract Although nanostructured (NS) and ultrafine-microstructure (UFM) materials possess excellent mechanical properties, how to manufacture bulk NS and UFM materials with minimum cost via direct casting remains challenging. Here, we report an efficient strategy to prepare bulk UFM alloys via the direct solidification method for eutectic high-entropy alloy (EHEA). As a proof of concept, we designed CoCrFeNiNb0.45 EHEA and achieved complete bulk UFM ingot with weight of 2.5 kg, demonstrating an...
Source
#1T. Yang (CityU: City University of Hong Kong)H-Index: 20
#2Yilu Zhao (CityU: City University of Hong Kong)H-Index: 18
Last. C.T. Liu (CityU: City University of Hong Kong)H-Index: 105
view all 13 authors...
Alloy design based on single–principal-element systems has approached its limit for performance enhancements. A substantial increase in strength up to gigapascal levels typically causes the premature failure of materials with reduced ductility. Here, we report a strategy to break this trade-off by controllably introducing high-density ductile multicomponent intermetallic nanoparticles (MCINPs) in complex alloy systems. Distinct from the intermetallic-induced embrittlement under conventional wisd...
Source
#1Xi Jin (HIT: Harbin Institute of Technology)H-Index: 9
#2Yang Zhou (HIT: Harbin Institute of Technology)H-Index: 11
Last. Bangsheng Li (HIT: Harbin Institute of Technology)H-Index: 8
view all 5 authors...
Abstract Eutectic high entropy alloys (EHEAs) have attracted wide attention of material scientists and engineering scientists due to the good castability, phase stability as well as excellent mechanical properties. However, it still remains a huge challenge to design EHEAs accurately on account of the inaccuracy of multicomponent phase diagram calculation and complexity of experimental exploration. Here, a simple and practicable pseudo binary method was proposed to design EHEAs using the paramet...
Source
#1Xi Jin (HIT: Harbin Institute of Technology)H-Index: 9
#2Yang Zhou (HIT: Harbin Institute of Technology)H-Index: 11
Last. Bangsheng Li (HIT: Harbin Institute of Technology)H-Index: 8
view all 5 authors...
Abstract Eutectic high entropy alloys (EHEAs) are recently of great interest due to their excellent mechanical properties. However, only a few EHEAs have so far been designed because of the lack of multi-component phase diagrams. Here, a new Fe20Co20Ni41Al19 EHEA was successfully designed and studied. The alloy exhibited a nano-lamellar eutectic microstructure composed of ordered BCC (B2) phase and ordered FCC (L12) phase. The room-temperature tensile strength and total elongation of the alloy w...
Source
#1Hui Jiang (DUT: Dalian University of Technology)H-Index: 16
#2Kaiming Han (DUT: Dalian University of Technology)H-Index: 5
Last. Tingju Li (DUT: Dalian University of Technology)H-Index: 18
view all 8 authors...
Abstract Eutectic high entropy alloys (EHEAs) hold promising industrial application potential, but how to design EHEA compositions remains challenging. In the present work, a simple and effective strategy by combining mixing enthalpy and constituent binary eutectic compositions was proposed to design EHEA compositions. This strategy was then applied to a series of (CoCrFeNi)M x (M = Nb, Ta, Zr, Hf) HEAs, leading to the discovery of new EHEAs, namely, CoCrFeNiNb 0.45 , CoCrFeNiTa 0.4 , CoCrFeNiZr...
Source
#1Yiping Lu (DUT: Dalian University of Technology)H-Index: 34
#2Hui Jiang (DUT: Dalian University of Technology)H-Index: 16
Last. Tingju Li (DUT: Dalian University of Technology)H-Index: 18
view all 6 authors...
Although eutectic high entropy alloys (EHEAs) display homogeneously fine microstructure, excellent castability and promising industrial application potential, how to design eutectic compositions in high entropy alloys (HEAs) remains to be challenging. Here, a novel strategy, specifically, through calculation of mixing enthalpy, was used to locate eutectic compositions in HEAs. As a proof of this concept, a series of EHEAs were located and prepared following the mixing enthalpy method. Using this...
Source
#1Xuzhou Gao (Nanjing University of Science and Technology)H-Index: 4
#2Yiping Lu (DUT: Dalian University of Technology)H-Index: 34
Last. Yonghao Zhao (Nanjing University of Science and Technology)H-Index: 53
view all 8 authors...
Abstract Recent studies indicate that eutectic high-entropy alloys can simultaneously possess high strength and high ductility, which have potential applications in industrial fields. Nevertheless, microstructural origins of the excellent strength–ductility combination remain unclear. In this study, an AlCoCrFeNi 2.1 eutectic high-entropy alloy was prepared with face-centered cubic (FCC)(L1 2 )/body-centered-cubic (BCC)(B2) modulated lamellar structures and a remarkable combination of ultimate t...
Source
#1Wenyi Huo (SEU: Southeast University)H-Index: 8
#2Hui Zhou (SEU: Southeast University)H-Index: 4
Last. Jianqing Jiang (SEU: Southeast University)H-Index: 21
view all 5 authors...
Abstract The emergence of eutectic high-entropy alloys containing Laves phase provides a new and exciting research direction towards developing advanced structural alloys, in light of the inherent advantages of Laves phase at elevated temperatures. In this work, CoCrFeNiZr x alloys were prepared with varying zirconium contents by vacuum arc-melting method. Typical eutectic microstructure was identified in the as-cast alloy having x = 0.5. The alloys consist of face-centered cubic solid solution ...
Source
Cited By10
Newest
#1Menglei Hu (BIT: Beijing Institute of Technology)
#2Kaikai Song (SDU: Shandong University)
Last. Weidong Song (BIT: Beijing Institute of Technology)
view all 3 authors...
Abstract null null The dynamic mechanical properties of the AlCoCrFeNi2.1 eutectic high-entropy alloy (EHEA) fabricated by drop-casting (DC) and suction-assisted casting (SC) are investigated under different strain rates and temperatures using Split Hopkinson Pressure Bar (SHPB) system. Microstructure analysis is conducted through SEM, EBSD and TEM to reveal the deformation and fracture mechanisms of the present EHEA. The yield strength and flow stresses for both the DC alloy and SC alloy increa...
Source
#1Peijian ShiH-Index: 3
#2Li Yi (SHU: Shanghai University)H-Index: 2
Last. Yunbo ZhongH-Index: 21
view all 17 authors...
Abstract Over recent years, eutectic high-entropy alloys (EHEAs) have intrigued substantial research enthusiasms due to their good castability as well as balanced strength–ductility synergy. In this study, a bulk cast Al19.25Co18.86Fe18.36Ni43.53 EHEA is developed with fine in-situ lamellar eutectics. The eutectics comprise alternating ordered face-centered-cubic (L12) and ordered body-centered-cubic (B2) phases with semi-coherent interfaces. The resulting microstructure resembles that of most r...
Source
#1Qiang Wang (WUST: Wuhan University of Science and Technology)H-Index: 1
Abstract The microstructure and room-temperature tensile deformation behavior of the cast CrFeCoNiAl0.7 high-entropy alloy (HEA) were studied in details. The cast HEA consisted of a dual-phase structure of 77. 3 vol. % face-centered-cubic (FCC) phase plus 22.7 vol.% B2 phase, and exhibited excellent room-temperature tensile properties with a high yield strength of 876 MPa, ultimate tensile strength of 1198 MPa and a relatively large elongation to fracture of ∼9 %. Dislocations gliding in the FCC...
Source
#1Qinqin Wei (WUT: Wuhan University of Technology)H-Index: 1
#2Guoqiang Luo (WUT: Wuhan University of Technology)H-Index: 23
Last. Akihiko Chiba (Tohoku University)H-Index: 53
view all 8 authors...
Abstract The dual-phase Re0.5MoNbW(TaC)0.5 composite, consisting of refractory body-centered cubic (BCC) high-entropy alloy and carbide with many fine eutectic structures, was successfully synthesized by arc melting. The phase stability, high-temperature mechanical properties and strengthening mechanism of the as-cast composite were studied. The microstructure of the composite remained stable after annealing at 13002103; for 168h. It exhibited remarkably high-temperature strength, yield strength...
Source
#1Hui Jiang (SDUST: Shandong University of Science and Technology)H-Index: 16
#2Li Li (SDUST: Shandong University of Science and Technology)
Last. Quanwei Wang (SDUST: Shandong University of Science and Technology)
view all 5 authors...
In the present study, a series of AlCoCrxFeNi2.1 (x = 0, 0.25, 0.5, 0.75, 1.0) eutectic high entropy alloys (EHEAs) have been designed and prepared. And the effect of Cr content on the microstructures and mechanical properties of the AlCoCrxFeNi2.1 alloys was systematically investigated. The results indicate that the AlCoCrxFeNi2.1 (x > 0) alloys exhibit almost complete lamellar eutectic microstructures with a mixture structure of FCC and B2 phases. And the AlCoFeNi2.1 alloy without Cr element e...
Source
#1Peijian Shi (SHU: Shanghai University)H-Index: 3
#2Runguang Li (USTB: University of Science and Technology Beijing)H-Index: 13
Last. Xue Liang (SHU: Shanghai University)H-Index: 6
view all 0 authors...
In human-made malleable materials, microdamage such as cracking usually limits material lifetime. Some biological composites, such as bone, have hierarchical microstructures that tolerate cracks but cannot withstand high elongation. We demonstrate a directionally solidified eutectic high-entropy alloy (EHEA) that successfully reconciles crack tolerance and high elongation. The solidified alloy has a hierarchically organized herringbone structure that enables bionic-inspired hierarchical crack bu...
Source
#1Xueling Huang (CSU: Central South University)H-Index: 1
#2Lanping Huang (CSU: Central South University)H-Index: 2
Last. Song Li (CSU: Central South University)H-Index: 1
view all 6 authors...
Abstract A non-equiatomic Ni3.5Co3Cr1.5 medium-entropy alloy (AT0) with a single-phase face-centered cubic structure (FCC) directly obtained by arc-melting shows the low yield strength of 147 MPa, ultimate tensile strength of 447 MPa and large total elongation to fracture of 78.8%. By doping Al and Ti, the as-cast (Ni3.5Co3Cr1.5)90Al5Ti5 high-entropy alloy (AT5) exhibits enhanced strength-ductility synergy. Compared to AT0 alloy, the yield strength of AT5 alloy increases more than fivefold to 79...
Source
Source
Source
This website uses cookies.
We use cookies to improve your online experience. By continuing to use our website we assume you agree to the placement of these cookies.
To learn more, you can find in our Privacy Policy.