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Journal of Wuhan University of Technology(Materials Science) 2009年第S1期24卷 13-16页

作者：关丽娜耿林 School of Materials Science & Engineering Harbin Institute of Technology

6061Al matrix composites reinforced by 5vol.%ABOw and 15vol.%SiCp were fabricated by semi-solid stirring technique successfully at 640 ℃ for 40min with the stirring rate of 300 rpm,and the composites were extruded at a temperature of 500 ℃ using an extrusion ratio of 25:1 *** tests were performed on as-casted and as-extruded(ABOw+SiCp)/6061Al composites at room temperature,and microstructures were observed by scanning electron microscope(SEM).SEM investigation showed that the as-extruded composite exhibited reduced porosity as well as a more uniform distribution of the reinforcements compared with the as-casted *** tensile tests results showed that the ultimate tensile strength and tensile elongation of as-extruded composite are higher than that of as-casted composite.

关键词： (ABOw+SiCp)/6061Al hot-extrusion semi-solid stirring mechanical properties microstructure

Effect of deformation on microstructure and conductivity of hypereutectic aluminum-silicon alloy

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稀有金属材料与工程 2011年第S3期40卷 47-50页

作者： Wang Yuxin 1, 2 , Zhang Yu 1 , Yang Ying 1 , Liao Wenjun 1 , Lu Wei 1 , Yan Biao 1 , Gao Wei 2 , Chen Weiwei 2 1 Tongji University, Shanghai 200092, China 2 The University of Auckland, PB 92019, Auckland, New Zealand Tongji Univ Shanghai Key Lab D&A Met Funct Mat Sch Mat Sci & Engn Shanghai 200092 Peoples R China Univ Auckland Auckland 1 New Zealand

Plastic deformation of sprayed alloy is an effective method to fabricate the hypereutectic aluminum-silicon alloy which combines good conductivity and toughness. In this study, Al-20Si-0.35 RE (wt%) alloy was synthesized by spray atomization and deposition technique. The sprayed deposition and over-spray powder were hot-extruded and plastic deformed respectively. Microstructure and conductivity were systematically performed in order to understand the influence of deformation on microstructure and conductivity of the hypereutectic alloy. The Si particles are refining and uniformly distributed in the Al matrix due to the proper addition of rare earth metal and the rapid solidification preparation method. The microstructure of plastic deformed alloy has invariably indicated that severe plastic deformation lead to the even refinement of microstructure. Both the conductivity of over-spray powder extrusion and sprayed deposition extrusion were obviously improved after plastic deformation. Possible mechanisms of deformation on microstructure and conductivity of hypereutectic aluminum-silicon alloy are discussed.

关键词： hypereutectic Al-Si alloy deformation hot-extrusion conductivity

Preparation and Characterization of High Conductivity Aluminium Silicon Alloy

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稀有金属材料与工程 2011年第S3期40卷 185-187页

作者： Liao Wenjun1, 2, Wang Yuxin1, Yu Zhang1, Yang Yinhui1, Dong Gang1, Yan Biao1 1Tongji University, Shanghai 200092, China 2Shanghai Electric Group Co., Ltd. Central Academe, Shanghai 200070, China Tongji Univ Shanghai Key Lab D&A Met Funct Mat Sch Mat Sci & Engn Shanghai 200092 Peoples R China Shanghai Elect Grp Co Ltd Cent Acad Shanghai 200070 Peoples R China

Hypereutectic aluminum-silicon alloy powder of Al-20Si-0.35RE was synthesized by using the inert gas atomization technique. This powder was ball milled for different time and hot extruded subsequently. The microstructure and electrical conductivity of alloy were studied by powder particle size analyzer, scanning electron microscope, X-ray diffraction and bridge resistance instrument respectively. It is indicated that the powder got by spray method have a better homogeneous distribution. The proper RE amount and milling time improved the conductivity due to either microstructural refining or decreasing of Si solid solubility in Al matrix. The conductivity changed with ball milling time, while unique high conductivity (75%IACS) could be achieved after milling for 12 h and hot-extruded 3 times. This kind of high conductivity aluminum-silicon alloy will be a potential conductor material which could be extensively used in the electrical engineering field.

关键词： hypereutectic Al-Si alloy gas atomization hot-extrusion conductivity

Effects of cerium on microstructure and mechanical properties of ZK60 alloy

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Journal of Central South University of Technology 2005年第5期12卷 515-520页

作者：夏长清王银娜吴安如古一 School of Materials Science and Engineering Central South University Changsha 410083 China

ZK60-xcerium alloys were studied,where x mass fraction is 0, 0.52%, 0.94%, 1.51% and 1.98%, respectively. Influence of Ce contents and heat-treatment on microstructure and tensile properties was analyzed. The results show that cast ZK60 alloy containing no Ce has coarse crystal grains, and lots of segregation aggregates around the grain-boundary. However, the alloys containing Ce have refined grains, and grain-boundaries are purified at the same time. Obvious dynamic recrystallization occurs in tested alloys after hot-extrusion. Tensile strength heightens with the increase of Ce content, and grows higher after aging at 150℃ for 024 h （T5 treatment）. Comparing tensile properties of investigated alloys in different states, it can be concluded that synthetical properties of the alloy with 1.51% Ce addition is the best of all. In extruded state, σb and δ of this alloy are 318.6 MPa and 14.4%, respectively. After aging for 24 h ,σb is 338.6 MPa and δ is 15.6%.

关键词： ZK60 alloy Cerium hot-extrusion dynamic recrystallization microstructure mechanical properties

Microstructures and mechanical properties of Mg-Ce-Zn-Zr wrought alloy

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Journal of Central South University of Technology 2004年第4期11卷 367-370页

作者：武文花夏长清 School of Materials Science and Engineering Central South University Changsha 410083 China

Microstructures and mechanical properties of （Mg-2.0%Ce-0.7%Zn-0.7%Zr） alloy were studied. The results of scanning electron microscopy show that Mg12Ce phase mainly distributes at the grain boundaries. The fine (Mg12Ce) phase can apparently elevate recrystallization temperature by preventing the grain boundary migration. No dynamic recrystallization occurs during the hot-extrusion. The mechanical properties of as extruded specimens are （σb=278.5 MPa,） δ=12.0%, while those of the specimens annealed at 250 ℃ for 100 h are σb=（272.6 MPa,） δ=（11.3%,） which indicate that the alloy has good mechanical properties at room temperature.

关键词： wrought magnesium alloy microstructure mechanical property hot-extrusion dynamic (recrystallization)