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| 1 | Microstructural evolution and corrosion behavior of directionally solidified FeCoNiCrAl high entropy alloy显示文摘The FeCoNiCrAl alloys have many potential applications in the fields of structural materials, but few attempts were made to characterize the directional solidification of high entropy alloys. In the present research, the microstructure and corrosion behavior of FeCoNiCrAl high entropy alloy have been investigated under directional solidification. The results show that with increasing solidification rate, the interface morphology of the alloy evolves from planar to cellular and dendritic. The electrochemical experiment results demonstrate that the corrosion products of both non-directionally and directionally solidified FeCoNiCrAl alloys appear as rectangular blocks in phases which Cr and Fe are enriched, while Al and Ni are depleted, suggesting that Al and Ni are dissolved into the NaCl solution. Comparison of the potentiodynamic polarization behaviors between the two differently solidified FeCoNiCrAl high entropy alloys in a 3.5%NaCl solution shows that the corrosion resistance of directionally solidified FeCoNiCrAl alloy is superior to that of the non-directionally solidified FeCoNiCrAl alloy. | Cui Hongbao Wang Ying Wang Jinyong Guo Xuefeng Fu Hengzhi | 2011 | China Foundry2011，8，3： | 7 |
| 2 | Microstructures and Tensile Properties of Hot-extruded Mg-6Zn-xCe(x=0,0.6,1.0,2.0) Alloys显示文摘Mg-6Zn-x Ce(x = 0, 0.6, 1.0, 2.0) alloy ingots with diameter of 50 mm were extruded into bars with diameter of 12 mm at 300 ℃. The microstructures were analyzed by X-ray diffraction, optical microscopy, scanning electron microscopy and transmission electron microscopy, and mechanical properties were tested at room temperature. The results showed that major intermetallic composition in as-cast Mg-6Zn and Mg-6Zn-0.6Ce alloys was Mg_4Zn_7 phase, during extrusion Mg_4Zn_7 phase was dissolved into matrix and then precipitated as MgZn_2. In as-cast and as-extruded Mg-6Zn-1Ce and Mg-6Zn-2Ce alloys the major intermetallic composition was T phase. The microstructure of as-extruded alloy was refined due to complete dynamic recrystallization, the average grain size decreased with increasing Ce content, which were 12.1, 11.7, 11.0 and 10.0 mm, respectively. High density MgZn_2 precipitated in Mg-6Zn and Mg-6Zn-0.6Ce alloys. The broken T phase particles were distributed linearly along extrusion direction. Mg-6Zn-0.6Ce alloy exhibited a high yield strength of 226.3 MPa that was about 24 MPa higher than Mg-6Zn alloy. However, with increasing Ce contents, the strengths were decreased slightly because the effects of precipitation strengthening of MgZn_2 and solid solute strengthening of Zn were weakened though the strengthening effect of T phase was enhanced. | 于合帅 杨文朋 CUI Hongbao GUO Xuefeng WANG Ying WU Yali | 2019 | Journal of Wuhan University of Technology(Materials Science)2019，34，1： | 3 |
| 3 | First-principle calculation on mechanical and thermal properties of B2-NiSc with point defects显示文摘Using the first-principles plane-wave pseudo-potential method based on density functional theory,the effect of vacancy and anti-position defect on the mechanical and thermal properties of B2-NiSc intermetallics were discussed in detail.Several parameters,such as the shear modulus,bulk modulus,modulus of elasticity,C_(11)-C_(12),the Debye temperature and Poisson's ratio,have been calculated to evaluate the effect of vacancy and anti-position defect on the hardness,ductility and thermal properties of B2-NiSc intermetallics.The results show that V_(Ni),Sc_(Ni),V_(Sc)and Ni_(Sc)the four point defects all make the crystal hardness decrease and improve plasticity of B2-NiSc intermetallics.The entropy,enthalpy and free energy of V_(Ni),Sc_(Ni),V_(Sc)and Ni_(Sc)are monotonously changed as temperature changes.From the perspective of free energy,Ni_(Sc)is the most stable,while Sc_(Ni)is the most unstable.Debye temperature of NiSc intermetallics with four different point defects shows V_(Ni),Sc_(Ni),V_(Sc)and Ni_(Sc)the four point defects all reduce the stability of B2-NiSc intermetallics. | Zhipeng Yuan Hongbao Cui Xuefeng Guo | 2017 | Journal of Semiconductors2017，38，1： | 1 |
| 4 | Primary Mg_(2)Si phase and Mg_(2)Si/α-Mg interface modified by Sn and Sb elements in a Mg-5Sn-2Si-1.5Al-1Zn-0.8Sb alloy显示文摘The microstructure of primary Mg_(2)Si and the interface of Mg_(2)Si/α-Mg modified by Sn and Sb elements in an as-cast Mg-5Sn-2Si-1.5Al-1Zn-0.8Sb(wt.%) alloy were investigated.In the primary Mg_(2)Si phase not only the Si atoms but also the Mg atoms could be substituted by Sn and Sb atoms,resulting in the slightly reduced lattice constant a of 0.627 nm.An OR of Mg_(2)Si phase and α-Mg in the form of[001]Mg_(2)Si‖[01■1]α,(220)Mg_(2)Si‖(0■12)αwas discovered.Between primary Mg_(2)Si phase and α-Mg matrix two transitional nano-particle layers were formed.In the rim region of primary Mg_(2)Si particle,Mg_(2)Sn precipitates sizing from 5 nm to 50 nm were observed.Adjacent to the boundary of primary Mg_(2)Si particle,luxuriant columnar crystals of primary Mg_(2)Sn phase with width of about 25 nm and length of about100 nm were distributed on the α-Mg matrix.The lattice constant of the Mg_(2)Sn precipitate in primary Mg_(2)Si particle was about 0.756 nm.Three ORs between Mg_(2)Sn and Mg_(2)Si were found,in which the Mg_(2)Sn precipitates had strong bonding interfaces with Mg_(2)Si phase.Three new minor ORs between Mg_(2)Sn phase and α-Mg were found.The lattice constant of primary Mg_(2)Sn phase was enlarged to 0.813 nm owing to the solution of Sn and Sb atoms.Primary Mg_(2)Sn had edge-to-edge interfaces with α-Mg.Therefore,the primary Mg_(2)Si particle and α-Mg were united and the interfacial adhesion was improved by the two nano-particles layers of Mg_(2)Sn phase. | Wenpeng Yang Ying Wang Hongbao Cui Guangxin Fan Xuefeng Guo | 2022 | Journal of Magnesium and Alloys2022，10，11： | 1 |
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