A series of AlxCrFe2Ni2Mo0.2 alloy consisting of FCC + BCC phases have been designed, and their as-cast microstructures and mechanical properties were also investigated with x ranging from 0.6 to 0.9. It was found that with the addition of Al element, the solidified structures changed from dendrite to columnar crystal then back to dendrite again. Moreover, the increased amount of BCC phase resulted in finer and more uniform microstructures of FCC [FeCrNi(Mo)] and BCC (Al–Ni) phases. Tensile yield strength and hardness of alloys showed a similar increasing trend as the volume fraction of BCC phase increased. Both strain hardening rate and strain hardening exponent were calculated to assess the tensile properties of the alloys. It was shown that Al0.6CrFe2Ni2Mo0.2 exhibited the most excellent and comprehensive mechanical properties due to its high work hardening ability and stable strain hardening rate. The product of strength and elongation of Al0.6CrFe2Ni2Mo0.2 reached up to 38.6 GPa%, which was higher than most of the reported as-cast high-entropy alloys.
Abstract High entropy alloys (HEAs) with a face-centered cubic (fcc) structure are considered as promising structural materials, in particular due to their impressive ductility and toughness at cryogenic temperature; at the same time strength of these HEAs is often quite low. An addition of interstitial elements like carbon substantially increases the strength of the fcc HEAs at room temperature, however the effect of C on cryogenic properties has not been properly studied. Therefore in this wor...
#1Q. Li(TUT: Taiyuan University of Technology)H-Index: 1
#2T.W. Zhang(TUT: Taiyuan University of Technology)H-Index: 6
Last. Z.H. Wang(TUT: Taiyuan University of Technology)H-Index: 7
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Abstract Al0.3CoCrFeNi high-entropy alloys (HEAs) with B2 ordered phase mainly precipitated at grain boundaries are obtained by cold rolling, annealing and aging treatment. Tensile experiments show that both CRSA (annealed at 1100 °C for 1 h) and CRSA-600-24 (annealed at 1100 °C for 1 h and subsequently aging treatment at 600 °C for 24 h) samples have excellent combinations of yield strength, tensile strength and tensile elongation at room temperature, and more importantly, simultaneous enhancem...
#1Chao Xiang(CAS: Chinese Academy of Sciences)H-Index: 4
#2Zhiming Zhang(CAS: Chinese Academy of Sciences)H-Index: 20
Last. Guo-Dong Hu(CAS: Chinese Academy of Sciences)H-Index: 1
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The development of high-entropy alloys (HEAs) has stimulated an ever-increasing interest from both academia and industries. In this work, three novel MoNbFeCrV, MoNbFeCrTi, and MoNbFeVTi HEAs containing low thermal neutron absorption cross section elements were prepared by vacuum arc melting. The microstructure, mechanical properties, and corrosion behaviors were investigated. A dominant body-centered cubic (BCC) phase was present in all these three HEAs. In addition, an ordered Laves phase was ...
#1Shujing Zheng(CAS: Chinese Academy of Sciences)H-Index: 7
#2Zhaobing Cai(CAS: Chinese Academy of Sciences)H-Index: 7
Last. Liping Wang(CAS: Chinese Academy of Sciences)H-Index: 61
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Abstract The VAlTiCrSi high-entropy alloy (HEA) film with excellent corrosion-resistance in artificial sea water was successfully and easily fabricated by DC magnetron sputtering. The target is spliced by high purity (>99.9%) V, Al, Ti, Cr and Si bars with periodic array. Based on the XRD and TEM results, it can be found that the HEA film shows a homogeneous microstructure of with amorphous phase, which is beneficial to enhance the barrier performance of substrate. In artificial seawater, the co...
Abstract In this work, we present a tunable alloying strategy to prepare high entropy alloy (HEA) thin films with FCC/BCC dual-phase structure. The dual-phase HEA films consist of uniformly equiaxed grains with average size about 40 nm. Comparing with single-phase FCC HEA, the dual-phase HEA has higher hardness up to 10.4 GPa. The relative large atomic radius of Al leads to severe lattice distortion, resulting in a stronger solid solution strengthening behavior in the dual-phase HEA. Moreover, h...
#1A. Verma(Defence Institute of Advanced Technology)H-Index: 1
#2P. Tarate(Defence Institute of Advanced Technology)H-Index: 1
Last. T. Shanmugasundaram(Defence Institute of Advanced Technology)H-Index: 8
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Abstract A series of CoCrFeNiCux (x = 0, 0.2, 0.4, 0.6, 0.8, 1.0) high entropy alloys (HEA) were prepared using arc melting technique and the effect of Cu on microstructure evolution and wear was studied both at room and high temperature. Microstructure reveals two phases, namely, CoCrFeNi and pure Cu. Wear rate at room temperature (RT) as well as at elevated temperatures (ET) decreases with increase in Cu content. However, wear resistance is found to be more at ET than RT. This is attributed to...
#1Xi Jin(HIT: Harbin Institute of Technology)H-Index: 8
#2Yuxin Liang(HIT: Harbin Institute of Technology)H-Index: 4
Last. Bangsheng Li(HIT: Harbin Institute of Technology)H-Index: 8
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Abstract The current study reports a novel heterogeneous AlCoCr2FeNi2 high entropy alloy (HEA) with an innovative structure and outstanding mechanical properties at various temperatures. The alloy is composed of the alternating face centered cubic (FCC) phase and the body centered cubic (BCC) phase, with the cubic ordered body centered cubic (B2) phase embedded in the BCC phase and the fusiform BCC phase embedded in the FCC phase homogeneously. The as-cast alloy shows excellent mechanical proper...
#1Zongrui Pei(ORNL: Oak Ridge National Laboratory)H-Index: 12
Abstract Modeling stacking faults in lightweight and medium- to high-entropy alloys is an exciting and fast developing field. Stacking faults and associated defects play a key role in understanding and modeling mechanical properties of alloys. We review the recent the studies of stacking faults, dislocations and twins in the novel alloys. Although this Review is focused on the theories and their applications in modeling stacking faults, relevant experimental progresses are also discussed. The Re...
#2Xiuyun Zhang(Northeastern University (China))H-Index: 8
Last. X.Y. Gu(NU: Northeastern University)H-Index: 1
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Abstract Effect of molybdenum on phases, microstructure and mechanical properties of Al0.5CoCrFeMoxNi (x = 0–0.5 mol) high entropy alloys has been investigated in this paper. The microstructure, phase constituents and mechanical properties of the alloys have been studied using scanning electron microscopy, X-ray diffraction, transmission electron microscopy, compressive and hardness tests. The possible equilibrium phases existing in the alloys have also been evaluated using the Thermo-Calc progr...
#1Xuzhou Gao(Nanjing University of Science and Technology)H-Index: 4
#2Yiping Lu(DUT: Dalian University of Technology)H-Index: 30
Last. Yonghao Zhao(Nanjing University of Science and Technology)H-Index: 53
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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...
Last. Xiaohua Chen(USTB: University of Science and Technology Beijing)H-Index: 9
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We introduce a non-equiatomic Fe61Mn18Si11Cr10 medium entropy alloy designed by subjecting it to transformation-induced plasticity upon deformation at room temperature. Microstructure characterization carried out using scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), transmission electron microscopy (TEM) and X-ray diffraction (XRD) shows a homogeneous solid solution FCC + BCC structured dual phase. Investigations on the deformation substructures at specific strain le...
