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Fracture mechanism of a laminated aluminum alloy plate during ballistic impact

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Rare metals 2017年第9期36卷 737-745页

作者： Ming-Yuan Li Bai-Qing Xiong Guo-Jun Wang You-Zhi Tong Xi-Wu Li Shu-Hui Huang Zhi-Hui Li Yong-An Zhang State Key Laboratory of Nonferrous metals and Processes General Research Institute for Nonferrous MetalsBeijing 100088China Northeast Light Alloy Co. Ltd.Harbin 150060China

The multilayered 7XXX series aluminum alloy was impacted by 7.62 mm ogival projectiles at velocities ranging from 787 to 851m·s^（-1）. The deformed microstructure under various impacting velocities and fracture surfaces of different sections were investigated at different physical scales to determine the process of *** microscopy（OM）,electron back-scattered diffraction（EBSD） and scanning electron microscopy（SEM） were used in the investigation. The results show that crater is constrained in the 7B52 front layer and two types of adiabatic shear bands which are transformed bands and deformed bands and different types of cracks are *** fracture is the significant failure mode of 7B52 front layer, and the resulting delamination leads to the presence of bending tensile fracture instead of the shear *** ductile 7A01 layer blunts and deflects the spall crack tips, preventing the targets from full spall, and induces a constraint of 7A52 rear layer. The level of the constraint determines different fracture modes of 7A52 layer,accounting for the asymmetry of damage.

关键词： Laminate Aluminum Ballistic impact Spallfracture Adiabatic shear bands

Quenching residual stress distributions in aluminum alloy plates with different dimensions

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Rare metals 2019年第11期38卷 1051-1061页

作者： Ya-Nan Li Yong-An Zhang Xi-Wu Li Zhi-Hui Li Guo-Jun Wang Long-Bing Jin Shu-Hui Huang Bai-Qing Xiong State Key Laboratory of Nonferrous metals and Process General Research Institute for Nonferrous MetalsBeijing 100088China Northeast Light Alloy Co. Ltd.Harbin 150060China

Finite element method(FEM) simulations were employed to investigate the quenching residual stress distributions of 7085 aluminum alloy *** effect of dimensional variation on the quenching residual stress distributions was studied and discussed by using models with different dimensions(length,width,and thickness).The accuracy and efficiency of the models were verified by other numerical *** order of the dimension effects on the quenching residual stress distributions is:thickness> width=*** maximum tensile stress and compressive stress increase from 33 to 190 and 39 to 270 MPa,respectively,as the thickness increases from 30 to 150 *** ultimate maximum tensile stress(about190 MPa) is equivalent to half of the quenching yield strength at 20℃,while the ultimate maximum compressive stress(about 300 MPa) is equivalent to 80 % of the quenching yield strength at 20℃.There are stress fluctuations at the edge of the large plate both in rolling and in transverse *** ratio of the fluctuation region along the rolling direction and transverse direction increases as the thickness increases,while it decreases as the length or width *** actual length of the fluctuation region is almost a constant value for the plates with a thickness of 115 mm(about 500 mm in length and 300 mm in width).

关键词： Aluminum alloy Quenching residual stress Dimension effects Finite element method

Elevated temperature endurance and creep properties of extruded 2D70 Al alloy rods

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Rare metals 2011年第3期30卷 310-315页

作者： WANG Guojun XIONG Baiqing ZHANG Yong＇an LI Zhihui State Key Laboratory of Nonferrous metals and Processes General Research Institute for Nonferrous Metals Beijing 100088 China Northeast Light Alloy Co. ltd. Harbin 150060 China

The elevated temperature performances of 2D70 Al alloy hot extrusion rods after two-stage homogenization and intensive deformation were studied by measuring the elevated temperature enduring strength and the creep ultimate strength. The fracture morphology of some selected samples after testing at different elevated temperatures was observed by scanning electron microscopy （SEM）. The results indicate that, as the test temperature increases, the elevated temperature enduring strength of 2D70 Al alloy decreases gradually. In a comparison between 150 C and 240 C, the notch enduring strength drops from 375 to 185 MPa and the smooth enduring strength drops from 337 to 130 MPa. Enduring strength is not sensitive to the notch. The notch sensitivity ratio （NSR） coefficient is in the range of 1.119 to 1.423 from 150 C to 240 C. The creep test results show that, as the test temperature increases from 150 C to 240 C, the creep ultimate strength of 2D70 Al alloy rods drops gradually from 312 to 117 MPa.

关键词： aluminum alloys high temperature properties strength of materials creep notched bar tensile testing

Nucleation mechanisms of dynamic recrystallization in Inconel 625 superalloy deformed with different strain rates

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Rare metals 2012年第3期31卷 215-220页

作者： Guo, Qingmiao Li, Defu Peng, Haijian Guo, Shengli Hu, Jie Du, Peng Nonferrous metals Processing Division General Research Institute for Nonferrous Metals Beijing 100088 China

The effects of strain rates on the hot working characteristics and nucleation mechanisms of dynamic recrystallization (DRX) were studied by optical microscopy and electron backscatter diffraction (EBSD) technique. Hot compression tests were conducted using a Gleeble-1500 simulator at a true strain of 0.7 in the temperature range of 1000 to 1150 °C and strain rate range of 0.01 to 10.00 s?1. It is found that the size and volume fraction of the DRX grains in hot-deformed Inconel 625 superalloy firstly decrease and then increase with increasing strain rate. Meanwhile, the nucleation mechanism of DRX is closely related to the deformation strain rate due to the deformation thermal effect. The discontinuous DRX (DDRX) with bulging of original grain boundaries is the primary nucleation mechanism of DRX, while the continuous DRX (CDRX) with progressive subgrain rotation acts as a secondary nucleation mechanism. The twinning formation can activate the nucleation of DRX. The effects of bulging of original grain boundaries and twinning formation are firstly gradually weakened and then strengthened with the increasing strain rate due to the deformation thermal effect. On the contrary, the effect of subgrain rotation is firstly gradually strengthened and then weakened with the increasing strain rate.

关键词： nucleation mechanisms dynamic recrystallization Inconel 625 superalloy deformation strain rate

Microstructure and mechanical properties of 7A56 aluminum alloy after solution treatment

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Rare metals 2021年第1期40卷 168-175页

作者： Feng-Bin Guo Bao-Hong Zhu Long-Bing Jin Guo-Jun Wang Hong-Wei Yan Zhi-Hui Li Yong-An Zhang Bai-Qing Xiong State Key Laboratory of Nonferrous metals and Processes General Research Institute for Nonferrous MetalsBeijing 100088China Northeast Light Alloy Co. Ltd.Harbin 150060China

The effect of solution treatment on the microstructure and mechanical properties of a novel 7 A56 aluminum alloy plate was investigated by optical microscopy(OM),scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray diffraction(XRD),differential scanning calorimetry(DSC),conductivity,hardness and tensile *** results indicate that the coarse second phases in the hot-rolled plate mainly consist of AlZnMgCu quaternary phase and Al_(7) Cu_(2) Fe phase,and no Al_(2) CuMg phase is *** amount of the second phases gradually reduces with the increase in temperature(450-480℃)and time(1-8 h)during the solution treatment,and the soluble particles are completely dissolved into the matrix after solution treatment at 470℃for 4 h,while the residual phases are mainly Fe-rich phase along the grain *** recrystallization fraction of the alloy gradually increases with the degree of solution treatment *** the temperature exceeds480℃,over-burning takes *** mechanical properties of samples treated at 470℃for various times were *** the solution treated at 470℃for 4 h,the quenching conductivity and peak-aged hardness of the alloy are 30.8%IACS and HV 204,*** ultimate tensile strength and yield strength of the samples aged at 120℃for 24 h are 661 and 588 MPa,respectively.

关键词： 7A56 aluminum alloy Solution treatment Aging treatment Microstructure Properties

Hot deformation behavior and finite element simulation of Mg-8.3Gd-4.4Y-1.5Zn-0.8Mn alloy

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Journal of Rare Earths 2022年第5期40卷 831-839,I0006页

作者： Jiabin Fan Minglong Ma Kui Zhang Yongjun Li Xinggang Li Guoliang Shi Jiawei Yuan State Key Laboratory of Nonferrous metals and Process GRINM Co.Ltd..Beijing 100088China GRIMAT Engineering Institute Co.ltd Beijing 101407China General Research Institute for Nonferrous metals Beijing 100088China

To study the hot deformation behavior of Mg-8.3 Gd-4.4 Y-1.5 Zn-0.8 Mn(wt%) alloy,hot compression tests were conducted using a Gleeble-3500 thermal simulator at temperatures ranging from 653 to773 K,true strain rates of 0.001-1 s^(-1),and a deformation degree of 60%.Results of hot compression experiments show that the flow stress of the alloy increases with the strain *** true stress-true strain curves are corrected by correcting the effect of temperature rise in the deformation *** energy,Q,equal to 287380 J/mol and material constant,n,equal to 4.59 were calculated by fitting the true stress-true strain ***,the constitutive equation was established and verified via finite element *** of the hot processing map show that the probability of material instability increases with the degree of deformation,which indicates that the material is not suitable for large deformation in a single *** the whole,the alloy is appropriate for multipass processing with small deformation and a suitable processing temperature and strain rate are 733 K and 0.01 s-1,respectively.

关键词： Mg-Gd-Y-Zn-Mn alloy Hot deformation Constitutive relationship Finite element simulation Processing map Rare earths

Hard magnetic properties of melt-spun nanocomposite Y_(16)Fe_(78)B_(6)ribbons

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Rare metals 2023年第2期42卷 602-605页

作者： Liang Sun Kuo-She Li Hong-Wei Li Dun-Bo Yu Yang Luo Jin-Ling Jin Shuo Lu Ning-Tao Quan GRIREM Advanced Materials ltd General Research Institute for Nonferrous MetalsBeijing100088China

Melt-spun Y_(16)Fe_(78)B_(6)ribbons were prepared by the melt-spinning technique with pure elements Y,Fe and Fe-B alloy n *** ribbons are mainly composed of Y_(2)Fe_(14)B,YFe_(2)andα-Fe *** phase appears at the wheel velocity of>35 m·s^(-1).For the ribbons prepared at optimum wheel velocity and heat treatments,the coercivity,remanence and maximum energy product are239.5 kA·m^(-1),0.61 T and 32.7 kJ·m-3,*** an investigation of Henkel plots of ribbons,it is found that intergrain exchange coupling leads to the enhancement of *** coercivity mechanism of ribbons prepared at 35 m·s^(-1)is mainly controlled by inhomogeneous pinning of domain *** phase component and magnetic properties change with annealing temperature and *** optimum magnetic properties are obtained with the ribbon quenched at 35 m·s^(-1)and annealed at 700℃for10 min.

关键词： Melt spinning Permanent magnets Y-Fe-B alloys Magnetic hardening

Creep resistance of Mg-4%Al-2%RE-2%Ca alloy

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中国有色金属学会会刊：英文版 2005年第4期15卷 863-867页

作者：薛山孙扬善诸天柏强立峰白晶周健 Depart ment of Materials Science and Engineering Southeast University Nanjing Welbow metals Co ltd

The creep resistance of the alloy Mg-4Al-2RE-2Ca（AEC422） and the base alloy AE42 was studied. The results reveal that the precipitated phases of AEC422 consist of Al2La and Al2Ca by contrast with the precipitated phase Al11La3 in AE42, which is instable and decomposes to Al2La and Al at high temperature. Creep resistance of AEC422 is significantly improved compared with that of AE42. The microstructure of AEC422 has no obvious changes after creep test at 175℃ and 70MPa, as compared to that before creep test, indicating that Al2La and Al2Ca have high thermal stability. Especially Al2Ca phase largely increases the strength of the grain boundaries in AEC422, which accounts for the creep resistance improvement.

关键词：合金 Al2Ca 有色金属稀土元素

Electrolytic silicon/graphite composite from SiO_(2)/graphite porous electrode in molten salts as a negative electrode material for lithium-ion batteries

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Rare metals 2022年第2期41卷 438-447页

作者： Ning Wang Yu-Yang Liu Zhi-Xia Shi Zhang-Long Yu Hua-Ying Duan Sheng Fang Juan-Yu Yang Xing-Ming Wang GRIREM Advanced Materials Co. Ltd.China Automotive Battery Research Institute Co.Ltd.General Research Institute for Nonferrous MetalsBeijing 100088China GRINM Resources and Environment Tech.Co.ltd. General Research Institute for Nonferrous MetalsBeijing 100088China China Automotive Battery Research Institute Co.ltd. General Research Institute for Nonferrous MetalsBeijing 100088China

Nano-silicon(nano-Si)and its composites have been regarded as the most promising negative electrode materials for producing the next-generation Li-ion batteries(LIBs),due to their ultrahigh theoretical ***,the commercial applications of nano Si-based negative electrode materials are constrained by the low cycling stability and high *** molten salt electrolysis of SiO_(2)is proven to be suitable to produce nano-Si with the advantages of in-situ microstructure control possibilities,cheap affordability and scale-up process ***,an economical approach for electrolysis,with a SiO_(2)/graphite porous electrode as cathode,is adopted to produce nano-Si/graphite composite negative electrode materials(SGNM)in this *** electrolytic product of the optimized porous electrode is taken as the negative electrode materials for LIBs,and it offers a capacity of 733.2 mAh·g^(-1)and an initial coulombic efficiency of 86.8%in a coin-type ***,the capacity of the SGNM retained 74.1%of the initial discharging capacity after 50 cycles at 0.2C,which is significantly higher than that of the simple mixture of silicon and graphite obtained from the formation of silicon carbide(SiC)between nano-Si and graphite ***,this new approach can be applied to a large-scale production.

关键词： Li-ion battery Negative electrode materials Molten salt electrolysis Nano-silicon