Novel as-cast AlCrFe 2 Ni 2 Ti 05 high-entropy alloy with excellent mechanical properties

Published on Oct 5, 2020in International Journal of Minerals Metallurgy and Materials2.232
· DOI :10.1007/S12613-020-2042-Z
Cheng-bin Wei1
Estimated H-index: 1
,
Xinghao Du23
Estimated H-index: 23
(SAU: Shenyang Aerospace University)
+ 3 AuthorsTongmin Wang36
Estimated H-index: 36
Sources
Abstract
We designed a novel Co-free AlCrFe2Ni2Ti0.5 high-entropy alloy (HEA) that features an excellent combination of strength and ductility in this study. The as-cast AlCrFe2Ni2Ti0.5 alloy showed equiaxed grains undergoing spinodal decomposition, which consisted of ultrafine-grained laminated body-centered cubic (bcc) phases and an ordered body-centered cubic (b2) phase, and some precipitates embedded in the b2 matrix. The bcc and b2 phases also feature a coherent interface. This unique structure impedes mobile dislocations and hinders the formation of cracks, thereby giving the AlCrFe2Ni2Ti0.5 HEA both high strength and plasticity. At room temperature, the as-cast AlCrFe2Ni2Ti0.5 alloy exhibited a compressive yield strength of 1714 MPa, an ultimate strength of 3307 MPa, and an elongation of 43%. These mechanical properties are superior to those of most reported HEAs.
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#1Shuo Shuang (CityU: City University of Hong Kong)H-Index: 1
#2Zhaoyi Ding (CityU: City University of Hong Kong)H-Index: 8
Last. Yong Yang (CityU: City University of Hong Kong)H-Index: 53
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Abstract In this work, we developed a nanostructured eutectic high entropy alloy (EHEA) of composition FeCrNiCoNb0.5 (atomic %). Due to the formation of a compact amorphous high entropy passive film and the two-phase nanostructure, our EHEA exhibits unique combination of a low corrosion current density, a large passivation region and a superior repassivation ability in 1 M NaCl, outperforming the variety of conventional alloys and other high entropy alloys hitherto reported. The outcome of our r...
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#1Yaoli Zhang (CAS: Chinese Academy of Sciences)H-Index: 3
#2Jinguo Li (CAS: Chinese Academy of Sciences)H-Index: 14
Last. Xiaofeng Sun (CAS: Chinese Academy of Sciences)H-Index: 25
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Abstract An eutectic high-entropy alloy consisting Al, Co, Cr, Fe and Ni elements was prepared by vacuum directional solidification technology. The alloy exhibits excellent comprehensive mechanical performance during tension at temperature range of 600~700 °C. The microstructure reveals the intersection of twin-twin is the prevailing deformation mechanism and the twins play a dual role in strengthening and toughening the alloy in the thermomechanical process. The deformation twin variants I and ...
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#1T. Yang (CityU: City University of Hong Kong)H-Index: 20
#2Yilu Zhao (CityU: City University of Hong Kong)H-Index: 18
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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...
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Last. T.G. Nieh (UT: University of Tennessee)H-Index: 86
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Abstract Microstructures and mechanical properties of Al-Ni-Co-Fe-Cr high-entropy alloys (HEAs) were investigated by systematically varying transition metals instead of Al, within the chemical formula of Al2M14 (M represents different mutations of transition metals). The formation of different crystal structures (FCC, BCC, or FCC+BCC mixture) and its effects on the resulting mechanical properties of this series of HEAs, both in tension and compression, were evaluated. It was found that, in the B...
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#1Gang Qin (HIT: Harbin Institute of Technology)H-Index: 10
#2Shu Wang (HIT: Harbin Institute of Technology)H-Index: 3
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• The effects of Nb on microstructure and the mechanical properties of the (CoCrCuFeNi) 100- x Nb x HEA were investigated.
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Abstract An AlMo 0.5 NbTa 0.5 TiZr baseline alloy was shown earlier to have good high temperature strength but poor ductility below 600 °C due to coarse intermetallic grain boundary particles and a continuous ordered B2 matrix phase. Systematic composition changes intended to remove the deleterious microstructural features and to improve mechanical properties were explored in the present work. The baseline alloy and the new alloys studied here, AlMo 0.5 NbTa 0.5 TiZr 0.5 , AlNbTa 0.5 TiZr 0.5 , ...
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#1Tengfei Yang (PKU: Peking University)H-Index: 21
#2Songqin Xia (USTB: University of Science and Technology Beijing)H-Index: 11
Last. Yugang Wang (PKU: Peking University)H-Index: 33
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Abstract Structural damage and chemical segregation in Al 0.1 CoCrFeNi high entropy alloy irradiated at elevated temperatures are studied using transmission electron microscopy (TEM) and atom probe tomography (APT). Irradiation-induced defects include dislocation loops, long dislocations and stacking-fault tetrahedra, but no voids can be observed. As irradiation temperature increases, defect density is decreased but defect size is increased, which is induced by increasing defect mobility. APT ch...
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#1Zhiqiang Fu (SCUT: South China University of Technology)H-Index: 35
#2Benjamin E. MacDonald (UCI: University of California, Irvine)H-Index: 9
Last. Enrique J. Lavernia (UCI: University of California, Irvine)H-Index: 97
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Abstract Face-centered cubic (fcc) nanostructured high entropy alloys (HEAs) are characterized by high strength and low plasticity. The objective of the present study was to investigate the question of whether it is possible to increase plasticity while retaining strength in a medium-entropy TiFeCoNi alloy by promoting the formation of a multi-scale microstructure. To accomplish this objective we synthesized a bulk Ti 10 Fe 30 Co 30 Ni 30 medium-entropy alloy (MEA) via mechanical alloying (MA) a...
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#2K.J. Chaput (FFO: Wright-Patterson Air Force Base)H-Index: 2
Last. Oleg N. Senkov (FFO: Wright-Patterson Air Force Base)H-Index: 68
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Abstract Refractory complex concentrated alloys (RCCAs) represent an emerging class of materials that have displayed significant potential for increased mechanical performance at extreme temperatures over conventional refractory alloys and Ni-base superalloys. While limited work has been conducted in this area, several RCCAs have shown remarkable levels of oxidation resistance in comparison to the majority of uncoated commercial refractory alloys. However, the oxidation mechanisms in these types...
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#1Yunzhu Shi (UT: University of Tennessee)H-Index: 6
#2Bin Yang (USTB: University of Science and Technology Beijing)H-Index: 20
Last. Peter K. Liaw (UT: University of Tennessee)H-Index: 97
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Abstract The present work investigates the influence of Al-content and potential-scan-rate on stable/metastable pitting of Al x CoCrFeNi high-entropy alloys in a 3.5 wt.% NaCl solution. The increased Al content causes the volume fraction of the Cr-depleted phase to increase, resulting in thicker/dispersive passive films that degrade the localized corrosion resistance. The varied stable/metastable pitting behavior under different potential scan rates indicates that pit generation is influenced by...
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#1Rong Guo (HUST: Huazhong University of Science and Technology)H-Index: 1
#2Lanlan Yu (HUST: Huazhong University of Science and Technology)H-Index: 1
Last. Lin Liu (HUST: Huazhong University of Science and Technology)H-Index: 1
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Heterogeneous nanostructured metals are emerging strategies for achieving both high strength and ductility, which are particularly attractive for high entropy alloys (HEAs) to combine the synergistic enhancements from multielement composition, grain boundaries, and heterogeneity effects. However, the construction of heterogeneous nanostructured HEAs remains elusive and can involve delicate processes that are not practically scalable. Herein we report using composition design (i.e., enthalpy engi...
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#1Wenrui WangH-Index: 7
#2Wu Qi (USTB: University of Science and Technology Beijing)H-Index: 2
Last. Yonghua XiangH-Index: 1
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(CoCrFeNi)95Nb5 high entropy alloy (HEA) coatings were successfully fabricated on a substrate of Q235 steel by laser cladding technology. These (CoCrFeNi)95Nb5 HEA coatings possess excellent properties, particularly corrosion resistance, which is clearly superior to that of some typical bulk HEA and common engineering alloys. In order to obtain appropriate laser cladding preparation process parameters, the effects of laser energy density on the microstructure, microhardness, and corrosion resist...
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#1Chunduo Dai (MOE: Chinese Ministry of Education)H-Index: 4
#2Yu Fu (MOE: Chinese Ministry of Education)H-Index: 4
Last. Cuiwei Du (MOE: Chinese Ministry of Education)H-Index: 5
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The effects of substrate temperature and deposition time on the morphology and corrosion resistance of FeCoCrNiMo0.3 coating fabricated by magnetron sputtering were investigated by scanning electron microscopy and electrochemical tests. The FeCoCrNiMo0.3 coating was mainly composed of the face-centered cubic phase. High substrate temperature promoted the densification of the coating, and the pitting resistance and protective ability of the coating in 3.5wt% NaCl solution was thus improved. When ...
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