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Effects of Superposed Field on Solidification Microstructure of Al-7wt%Si Alloy Zhihua Wang1, a, Ming Zhu1 and Guangji Xu2 1College of Material Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China 2State key laboratory of advanced nonferrous metal materials, Lanzhou University of Technology, Lanzhou 730050, Gansu, China awangzhihua_wx@163.com Keywords: Superposed Field; Solidification Microstructure; Grain Refinement Abstract.
Introduction The application of an electric or magnetic field during the solidification of materials, so called electromagnetic processing of materials (EPM), has been found to have an influence on the microstructure of the resulting solid especially on the grain refinement, since magnetic field was applied to the solidification process of metal by Johnson et al. in 1965[1-4].
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The materials in experiment are zirconia ceramics (ZrO2).
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However, PVDF is so chemical-resistant that the topcoated PVC membrane material cannot be welded to PVC membrane materials.
This extra operation increases the cost of fabrication and carries risks associated with the grinding depth calibration of the abrasion machine [6].Furthermore, membrane materials usually used as roof materials and tent fabrics, dusts on these surfaces were difficult to be cleaned.
Materials and Methods PVDF powder was purchased from Shanghai 3F New Material Co.
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Experimental procedure Chemical composition of Al-W powder materials is listed in Table 1.
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When local temperature of materials rise due to plastic deformation and it result in higher thermal softening effect than the material deformation strengthening effect, thermoplastic shear instability happens [5].
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The samples of nominal composition Zr55Ni5Al10Cu30 and Zr50Cu50 used in this work were prepared by arc melting with high purity materials.
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Materials were taken ST14, SS304, DDQ, and Al from the DYNAFORM material library, were identified as 1 #, 2 #, 3 #, 4 #.
Deep drawing process needs plastic deformation and the slip of materials.
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