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Production of A356 aluminum alloy wheels by thixo-forging combined with a low superheat casting process

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China Foundry 2013年第5期10卷 299-303页

作者： Wang Shuncheng Cai Chang Zheng Kaihong Qi Wenjun Institute of metal Processing Forming Technology Guangdong General Research Institute of Industrial Technology

The A356 aluminum alloy wheels were produced by thixo-forging combined with a low superheat casting process. The as-cast microstructure, microstructure evolution during reheating and the mechanical properties of thixo-forged wheels made from the A356 aluminum alloy were studied. The results show that the A356 aluminum alloy round billet with fine, uniform and non-dendritic grains can be obtained when the melt is cast at 635 ℃ When the round billet is reheated at 600 ℃ for 60 min, the non-dendritic grains are changed into spherical ones and the round billet can be easily thixo-forged into wheels. The tensile strength, yield strength and elongation of the thixo-forged wheels with T6 heat treatment are 327.6 MPa, 228.3 MPa and 7.8%, respectively, which are higher than those of a cast wheel. It is suggested that the thixo-forging combined with the low superheat casting process is an effective technique to produce aluminum alloy wheels with high mechanical properties.

关键词： semisolid metal thixo-forging low superheat casting aluminum alloy wheel

Joining of SiO2f/SiO2 composite to Nb using Ag-Cu-In-Ti brazing alloys

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Journal of Materials Science & Technology 2020年第15期47卷 13-20页

作者： Bo Chen Wen-Jiang Zou Wen-Wen Li Shi-Biao Wu Hua-Ping Xiong Xin Wu Welding and Plastic forming division Beijing Institute of Aeronautical MaterialsBeijing100095China

Three compositions of Ag-Cu-In-Ti system brazing alloys were designed for joining SiO2 f/SiO2 ceramic composite to Nb *** wettability of the three alloys on the composite was studied with the sessile drop *** results showed that after heating at 1073 K for 30 min,they exhibited contact angles of 74°,83° and 86°,*** brazing alloys were fabricated into foils by rapid solidification *** the three brazing filler alloys the joints brazed with AgCu-10 In-5 Ti at 1073 K for 10 min presented the maximum average shear strength of 30.9 *** the brazing process the active element Ti diffused strongly from the filler alloy to the composite surface and a reaction layer with a thickness of 2-3 μm was *** metallurgical bonding was also achieved at the Nb *** interface structure of the joint brazed with the AgCu-10 In-5 Ti alloy can be described as the following sequence:SiO2 f/SiO2→SiO2+Cu3 Ti3 O→SiO2+TiO+Ti5 Si4→Ag(s,s)+(Cu-Ti)→***,for the filler alloy with 4.0 wt% Ti content the joint strength was only 15.8 MPa.

关键词： Joining Composites Strength SiO2

Fabrication of Grain-oriented (Bi,Pb)_2Sr_2Ca_2Cu_3O_x Superconducting Tapes Using Magnetic Field and Vibration Technique

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Journal of Materials Science & Technology 1998年第1期14卷 86-88页

作者： Yanwei MA and Xianjin WANG (Dept. of metal forming, University of Science and Technology Beijing, Beijing 100083, China)Zutang WANG (Tsinghua University, Beijing 100084, China) Dept. of metal forming University of Science and Technology Beijing Beijing 100083 China Tsinghua University Beijing 100084 China

Highly textured (Bi,Pb)2Sr2Ca2Cu3Ox superconducting tapes have been fabricated by means of magnetic-field and vibration technique. This method is an effective way of improving the degree of grain alignment and density of oxide core in tapes after heat treatment and pressing *** of above 20% was increased than that without treatment.

关键词： Bi,Pb Pb Sr Fabrication of Grain-oriented x Superconducting Tapes Using Magnetic Field and Vibration Technique Ca Cu

Twin recrystallization mechanisms in a high strain rate compressed Mg-Zn alloy

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Journal of Magnesium and Alloys 2021年第2期9卷 499-504页

作者： Yuxuan Liu Yangxin Li Qingchun Zhu Huan Zhang Xixi Qi Jinhui Wang Peipeng Jin Xiaoqin Zeng National Engineering Research Center of Light Alloy Net forming and State Key Laboratory of metal Matrix Composite Shanghai Jiao Tong University200240 ShanghaiPR China Qinghai Provincial Engineering Research Center for High Performance Light metal Alloys and forming Qinghai UniversityXining 810016PR China

Static recrystallization of a high strain rate compressed Mg-1 Zn(wt.%)alloy was investigated using electron backscattered diffraction(EBSD).A novel 53°1010 structure was observed in the as-deformed alloy,which showed a{1012}-{1012}double twin relationship with the *** the as-deformed alloy was annealed at 200°C,the{1011}compression twins and{1011}-{1012}double twins showed a higher priority to *** addition,the coarse{1012}tension twins and their inner double twins were preferentially to recrystallize,while the lenticular tension twins had little impact on the ***,obtaining more compression twins or coarse twins instead of lenticular tension twins can be an effective approach to manipulate recrystallization process in deformed Mg alloys.

关键词： Magnesium alloy High strain rate deformation Recrystallization Twin

RELATIONSHIP BETWEEN GAUGE DIMENSION, GRAIN SIZE AND SUPERPLASTIC ELONGATION

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Chinese Science Bulletin 1991年第12期36卷 1046-1049页

作者：蒋兴钢崔建忠马龙翔 Department of metal forming Northeast University of Technology Shenyang 110006 PRC

Although several formulas for predicting the total elongation of the superplastic deformation have been reported, up to now, there is still no one which directly shows the relationship between gauge dimension, grain size and superplastic elongation of a specimen. In consideration of the irregularity of the fracture surface of a superplastic tensile specimen which is approximately self-similar, a fractal model for the fracture of materials during

关键词： elongation gauge dimension grain size.

VARIATIONAL PRINCIPLE FOR RIGID PLASTIC COMPRESSIBLE MATERIALS

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Chinese Science Bulletin 1990年第8期35卷 692-695页

作者：刘相华 Department of metal forming Northeast University of Technology Shenyang 110006 PRC

Since the slightly compressible method in R. P. FEM (Rigid Plastic Finite Element Method) was proposed by K. Mori, it has been used extensively in metal forming processes. One of the theoretical bases of R. P. FEM is ... 详细信息

关键词： R.P FEM slightly compressible method variational principle.

EFFECT OF AGING ON SUPERPLASTIC DEFORMATION BEHAVIOR OF HIGH STRENGTH LC_4 ALUMINIUM ALLOY

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Chinese Science Bulletin 1990年第21期35卷 1836-1839页

作者：蒋兴钢吴庆龄崔建忠马龙翔 Department of metal forming Northeast University of Technology Shenyang 110006 PRC

Hamilton and ZHOU Shan-you reported that, because the high strength aluminium alloy 7075 contains more Fe and Si impurities than the high strength aluminium alloy 7475 does, its superplastic elongation is lower than t... 详细信息

关键词： artificial aging superplasticity thermomechanical treatment.

The effect of basal dislocation on {11■1} twin boundary evolution in a Mg-Gd-Y-Zr alloy

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Journal of Materials Science & Technology 2021年第22期81卷 212-218页

作者： Huan Zhang Yangxin Li Yuxuan Liu Qingchun Zhu Xixi Qi Gaoming Zhu Jinhui Wang Peipeng Jin Xiaoqin Zeng National Engineering Research Center of Light Alloy Net forming and State Key Laboratory of metal Matrix Composite Shanghai Jiao Tong UniversityShanghai200240PR China Qinghai Provincial Engineering Research Center for High Performance Light metal Alloys and forming Qinghai UniversityXining810016PR China

This study aims to understand the features of{11■1}twin boundaries in a high strain rate compressed Mg-10 Gd-3Y-0.4Zr using electron backscatter diffraction(EBSD)and transmission electron microscopy(TEM).Based on the Schmid factor calculations,the basal dislocations are easily activated within the{11■1}twin and suppressed in the surrounding *** consequent basal dislocation-twin interaction during deformation can lead to the misorentiation deviation of{11■1}twin boundaries,accompanying with the formation of a step at the twin *** a{11■1}twin boundary evolution mechanism provides a new vision of twinning behavior in Mg alloys.

关键词： Mg alloys Plastic deformation Twinning Dislocation Misorientation

Effect of homogenization on the microstructure and mechanical properties of the repetitive-upsetting processed AZ91D alloy

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Journal of Materials Science & Technology 2017年第9期33卷 935-940页

作者： Li Zhang Qudong Wang Wenjun Liao Wei Guo Bing Ye Haiyan Jiang Wenjiang Ding National Engineering Research Center of Light Alloy Net forming and State Key Laboratory of metal Matrix Composites Shanghai Jiao Tong University

The current research investigates the effect of homogenization on the microstructure and mechanical properties of the AZ91 D alloy processed by repetitive upsetting（RU）. Results show that during RU processing, the initial large Mg;Al;particles in the as-cast specimen accelerate the dynamic recrystallization（DRX） due to the particle stimulating nucleation（PSN） mechanism. With the progress of RU,the inherent large strain breaks the large second phases into small fragments, which indicates the PSN gradually disappears, while the pinning effect becomes obvious. As for the homogenized specimen, a pre-heat treatment leads to the absence of Mg;Al;particles but a uniform distribution of Al atoms in the Mg alloy. Though the subsequent RU promotes the precipitation of Mg;Al;particles, the relatively small particle size and the uniform distribution are more favorable to act as obstacles for grain growth than contributors to PSN. Finally, a more homogeneous and refined microstructure is obtained in the specimen with prior homogenization than the as-cast one.

关键词： Repetitive upsetting Magnesium alloy Microstructure Precipitates Mechanical properties