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Hot Tearing Susceptibility of AXJ530 Alloy Under Low-Frequency Alternating Magnetic Field

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Acta Metallurgica Sinica(English Letters) 2020年第9期33卷 1259-1270页

作者： Xudong Du Feng Wang Zhi Wang Xingxing Li Zheng Liu Pingli Mao College of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China key laboratory of magnesium alloys and the processing technology of liaoning province Shenyang 110870China

Herein, a hot tearing measured system with external excitation coil and a differential thermal analysis system with applied magnetic field were used to study the effects of low-frequency alternating magnetic field on the solidification behavior and hot tearing susceptibility(HTS) of the AXJ530 alloy under different magnetic field parameters. The hot tearing volume of the castings was measured via paraffin infiltration method. The microstructure of the hot tearing zone of the casting was observed using optical microscopy and scanning electron microscopy, and the phase composition was analyzed using X-ray diffraction and energy depressive spectroscopy. The experimental results show that the solidification interval of AXJ530 alloy was shortened and the dendrite coherency temperature of the alloy decreased with the increase in frequency of alternating magnetic field. Under appropriate magnetic field parameters, the electromagnetic force could enhance the convection in the melt to promote the flow of the residual liquid phase, refine the microstructure, and optimize the feeding channel in the late solidification stage, which reduced the HTS of the alloy. However, when the magnetic field frequency was increased to 15 Hz, the induced current generated excessive Joule heat to the melt. At this time, the thermal action of the magnetic field coarsened the microstructure of the alloy, resulting in an increase in HTS of the alloy.

关键词： AXJ530 alloy Hot tearing susceptibility Alternating magnetic field Microstructure

Effect of long-period stacking ordered phase on hot tearing susceptibility of Mg-lZn-xY alloys

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Journal of magnesium and alloys 2020年第4期8卷 1176-1185页

作者： Ye Zhou Pingli Mao Le Zhou Zhi Wang Feng Wang Zheng Liu School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China key laboratory of magnesium alloys and the processing technology of liaoning province China

The effect of long-period stacking ordered(LPSO)phase on hot tearing susceptibility of Mg-1 Zn-xY serial alloys were investigated experimentally using a home-made T-type hot tearing *** characteristic parameters related to HTS during the solidification process were calculated by thermal *** microstructure and morphology of the crack zone were characterized by optical microscope(OM),scanning electron microscopy(SEM)and electron dispersive spectrometer(EDS),and the phases of the alloys were analyzed by X-ray diffraction(XRD).The result showed that the long-period stacking ordered(LPSO)phase formed when m(Zn)/m(Y)alloys could benefit the hot tearing refilling and decrease the HTS of the *** in creasing the content of LPSO phase,the HTS of the alloys *** phase increased the skeleton strength,and reduced the HTS of Mg-lZn-xY alloys.

关键词： Mg-Zn-Y alloys Hot tearing susceptibility Thermal analysis LPSO phase Numerical simulation

Effect of addition of minor amounts of Sb and Gd on hot tearing susceptibility of Mg-5Al-3Ca alloy

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Journal of magnesium and alloys 2023年第2期11卷 694-705页

作者： Xudong Du Feng Wang Zhi Wang Le Zhou Zheng Liu Pingli Mao School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870P R China key laboratory of magnesium alloys and the processing technology of liaoning province Shenyang 110870P R China

The effects of addition of minor amount of(0.5 wt.%) antimony(Sb) or gadolinium(Gd) and combined addition of Sb and Gd(0.5 wt.%,respectively) on the hot tearing susceptibility(HTS) of Mg-5Al-3Ca alloy were investigated experimentally using a “T-shaped” hot tearing measuring system. Various solidification parameters of the alloys were measured and calculated through thermal analysis experiments. The microstructure, grain size, and morphology of the crack zone were characterized by scanning electron microscopy and electron backscatter diffraction, and the crystal phases of the alloys were analyzed by X-ray diffraction and energy-dispersive X-ray spectroscopy. The results showed that the addition of 0.5 wt.% Gd resulted in the increase in the vulnerable temperature range(Tv) and reduced the eutectic structure content that could participate in feeding, thereby improving the HTS of the alloy. However, addition of 0.5 wt.% Sb or combined addition of Gd and Sb(0.5 wt.%, respectively) to the Mg-5Al-3Ca alloy shortened the Tvand improved the skeleton strength of the alloy, thereby reducing HTS. Moreover, significantly refined structure of Mg-5Al-3Ca-0.5Gd-0.5Sb alloy improved the feeding ability of the eutectic structure, thus the alloy exhibited the lowest HTS.

关键词： Hot tearing susceptibility Mg-5Al-3Ca alloy Thermal analysis Microstructure

Deformation mechanism of fine grained Mg-7Gd-5Y-l.2Nd-0.5Zr alloy under high temperature and high strain rates

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Journal of magnesium and alloys 2020年第4期8卷 1144-1153页

作者： Wanru Tang Zheng Liu Shimeng Liu Le Zhou Pingli Mao Hui Guo Xiaofang Sheng School of Materials Science and Engineering Shenyang University of Technology110870China key laboratory of magnesium alloys and the processing technology of liaoning province 110870China Wanfeng Auto Holding Group Shaoxing312500China

Fine grained Mg-7Gd-5Y-1.2Nd-0.5Zr alloy was investigated by dynamic compression tests using a Split Hopkinson Pressure Bar under the strain rates in the range 1000-2000 s^(-1) and the temperature range 293-573 K along the normal *** microstructure was measured by optical microscopy,electron back-scattering diffraction,transmission electron microscopy and X-ray *** results showed that Mg-7Gd-5Y-1.2Nd-0.5Zr alloy had the positive strain rate strengthening effect and thermal softening effect at high *** solid solution of Gd and Y atoms in Mg-7Gd-5Y-1.2Nd-0.5Zr alloy reduced the asymmetry of α-Mg crystals and changed the critical shear stress of various deformation *** main deformation mechanisms were prismatic slip and pyramidal(a)slip,{102}tension twinning,and dynamic recrystallization caused by local deformation such as particle-stimulated nucleation.c 2020 Published by Elsevier *** behalf of Chongqing University.

关键词： Mg-7Gd-5Y-1.2Nd-0.5Zr magnesium alloy High strain rate deformation Local deformation mechanism

Effect of copper addition on precipitation behaviors and mechanical properties of Mg-Zn-Cu alloys with respect to high zinc

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Journal of magnesium and alloys 2024年第12期12卷 5194-5204页

作者： Ye Zhou Shengli Li Pingli Mao Xingang Ai Qinghe Xiao Zheng Liu School of Materials and Metallurgy University of Science and Technology LiaoningAnshan 114051PR China School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870PR China key laboratory of magnesium alloys and the processing technology of liaoning province PR China

The current work deals with the precipitation behaviors and mechanical properties of the high zinc content of the Mg-Zn-Cu system alloys using gravity *** scanning calorimetry(DSC)was conducted to describe the solidification process and precipitation *** calculations were carried out to determine the precipitation conditions using the Thermo-calc *** microstructures were characterized by an optical microscope(OM),scanning electron microscope(SEM),electron probe micro analysis(EPMA),transmission electron microscopy(TEM),and confocal laser scanning microscope(CLSM).Tensile tests and micro-hardness tests were applied to investigate the mechanical *** results substantiated that the Mg Zn Cu phase precipitates in Cu-containing alloys and that the precipitate content,as well as the precipitate temperature,increased with the Cu content from 0 to 3 wt.%according to the thermodynamic calculations and the DSC *** measured micro-hardness of the alloy was 53.2,57.9,55.8,and 52.5 VHN,*** ultimate tensile strength(UTS),yield strength(YS),and elongation(EL)revealed a λ-like trend of the alloys,and Mg-7Zn-1Cu alloy exhibits the optimum tensile properties with the UTS of 258.9 MPa,YS of 126.2 MPa,and the EL of 14.2%.

关键词： Mg-Zn-Cu alloy Microstructure evolution Mechanical properties Thermodynamic calculation

Electrodeposition of aluminum and aluminum-magnesium alloys at room temperature

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Journal of Central South University 2015年第10期22卷 3689-3697页

作者：阚洪敏祝跚珊张宁王晓阳 key laboratory of Advanced Materials technology of liaoning province Shenyang University

Electrodeposition of aluminum from benzene-tetrahydrofuran-Al Cl3-Li Al H4 was studied at room temperature. Galvanostatic electrolysis was used to investigate the effect of various parameters on deposit morphology and crystal size, including current density, temperature, molar ratio of benzene/tetrahydrofuran and stirring speed. The deposit microstructure was adjusted by changing the parameters, and the optimum operating conditions were determined. Dense, bright and adherent aluminum coatings were obtained over a wide range of current densities(10-25 m A/cm2), molar ratio of benzene and tetrahydrofuran(4:1 to 7:8) and stirring speeds(200-500 r/min). Smaller grain sizes and well-adhered deposits were obtained at lower temperatures. Aluminum-magnesium alloys could potentially be used as hydrogen storage materials. A novel method for Al-Mg deposition was proposed by using pure Mg anodes in the organic solvents system benzene-tetrahydrofuran-Al Cl3-Li Al H4. XRD shows that the aluminum-magnesium alloys are mainly Al3Mg2 and Al12Mg17.

关键词： electrodeposition aluminum coating aluminum-magnesium(Al-Mg) coating organic solvent system

Effect of Cu on microstructure,mechanical properties,and texture evolution of ZK60 alloy fabricated by hot extrusion−shearing process

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Transactions of Nonferrous Metals Society of China 2020年第6期30卷 1511-1523页

作者： Shuai DAI Feng WANG Zhi WANG Zheng LIU Ping-li MAO School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China key laboratory of magnesium alloys and the processing technology of liaoning province Shenyang 110870China

As-cast Mg-6Zn-xCu-0.6Zr(x=0,0.5,1.0,wt.%)alloys were fabricated by permanent mold casting;then,the alloys were subjected to homogenization heat treatment and extrusion-shearing(ES)*** microstructure and mechanical properties of the alloys were evaluated by OM,SEM/EDS,XRD,TEM,EBSD and tensile *** results show that the hard MgZnCu phase in Cu-added alloy can strengthen particle-stimulated nucleation(PSN)effect and hinder the migration of dynamic recrystallization(DRX)grain boundary at an elevated temperature during *** ZK60+0.5Cu alloy shows an optimal tensile strength–ductility combination(UTS of 396 MPa,YS of 313 MPa,andδ=20.3%)owing to strong grain boundary strengthening and improvement of Schmid factor for{0001}■basal *** aggregation of microvoids around the MgZnCu phase mainly accounts for the lower tensile elongation of ZK60+1.0Cu alloy compared with ZK60 alloy.

关键词： Mg-Zn-Cu-Zr alloy extrusion-shearing process microstructure characterization mechanical properties texture evolution strengthening mechanism

Fabrication of fine-grained,high strength and toughness Mg alloy by extrusion−shearing process

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Transactions of Nonferrous Metals Society of China 2021年第3期31卷 666-678页

作者： Bo-ning WANG Feng WANG Zhi WANG Zheng LIU Ping-li MAO School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China key laboratory of magnesium alloys and processing technology of liaoning province Shenyang 110870China

A novel extrusion-shearing(ES) composite process was designed to fabricate fine-grained, high strength and tough magnesium alloy. The structural parameters of an ES die were optimized by conducting an orthogonal simulation experiment using finite element software Deform-3D, and Mg-3 Zn-0.6 Ca-0.6 Zr(ZXK310) alloy was processed using the ES die. The results show that the optimized structural parameters of ES die are extrusion angle(α) of 90°, extrusion section height(h) of 15 mm and inner fillet radius(r) of 10 mm. After ES at an extrusion temperature and a die temperature of 350 °C, ZXK310 alloy exhibited good ES forming ability, and obvious dynamic recrystallization occurred in the forming area. The grain size decreased from 1.42 μm of extrusion area to 0.85 μm of the forming area. Owing to the pinning of second phase and formation of ultrafine grains, the tensile strength, yield strength and elongation of alloy reached 362 MPa, 289 MPa and 21.7%, respectively.

关键词： Mg−Zn−Ca−Zr alloy extrusion−shearing process die design dynamic recrystallization mechanical properties

Data-driven design of novel lightweight refractory high-entropy alloyswith superb hardness and corrosion resistance

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npj Computational Materials 2024年第1期10卷 536-548页

作者： Tianchuang Gao Jianbao Gao Shenglan Yang Lijun Zhang State key laboratory of Powder Metallurgy Central South UniversityChangshaHunanChina State key laboratory of Materials processing and Die&Mould technology Huazhong University of Science and TechnologyWuhanHubeiChina National Engineering Research Center for magnesium alloys Chongqing UniversityChongqingChina

Lightweight refractory high-entropy alloys(LW-RHEAs)hold significant potential in the fields of aviation,aerospace,and nuclear energy due to their low density,high strength,high hardness,and corrosion ***,the enormous composition space has severely hindered the development of novel LW-RHEAs with excellent comprehensive *** this paper,an machine learning(ML)-based alloy design strategy combined with a multi-objective optimization method was proposed and applied for a rational design of Al-Nb-Ti-V-Zr-Cr-Mo-Hf *** quantitative relation of“composition-structure-property”was first established by ML ***,feature analysis reveals that Cr content greater than 12 at.

关键词： corrosion alloys resistance