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SiC particle reinforced aluminum matrix composite semi-solid formed parts and properties

The role of the two. Strengthening effect is mainly by the following causes: increased particles in the matrix dispersed, an increase of particles and the matrix phase boundary, and so the phase boundary around the Fat Printing If {find grumble knock Yang, such as adding 0 to 4 Shanghai Metal 26 serious distortion of the lattice volume of Health, has played the role of the grain boundary strengthening, thereby strengthening the matrix played a role. Therefore, the composite particles increased the higher the percentage, strengthen the role played by the more evident. The weakening effect of SiC particles is mainly due to fragmentation of the substrate; the same time, the infiltration of SiC particles and aluminum is very poor,[link widoczny dla zalogowanych], in the actual process of preparation of composite materials are often prone to enhance the agglomeration of particles, with the reinforcement particles content increases, the more this agglomeration may occur, so that could lead to defects generated by the applied load in, it is easy in these reunion at fault, thus reducing the strength of the material at this time,[link widoczny dla zalogowanych], weakening the role of to dominate, as shown in Figure 5, when the SiC content of 22%, the phenomenon is more obvious this reunion. Infiltration of SiC particles and aluminum particles and can lead to poor bonding strength is not enough, therefore, continue to increase the content of reinforcement particles, the strength of the material particles and the matrix due to the limitations of the bonding strength decreased. In both interactions, the tensile strength first increased with increasing SiC content,[link widoczny dla zalogowanych], when the SiC content reaches a certain level, the tensile strength but with increase of SiC content decreased. Figure 5 contains 22% SiC composite material structure can be seen from Figure 4, the elastic modulus increases with SiC content has been increased. Mainly due to the applied load to bear, the distribution of SiC particles in the matrix will be effectively bound the elastic deformation of the matrix, SiC particles the more the more obvious effect of this constraint; the same time, SiC particles is much larger than its elastic modulus matrix elastic modulus, therefore, as the volume fraction of reinforcement increases, the elastic modulus of composite materials to increase. 4 Conclusion (1) gravity casting composites developed under existing dendrites, the non-dendrite composite stock rose-like organizations, through semi-solid forming was after the ball, SIC/A356 composite materials in different states morphology and A356 under the corresponding state in the morphology is similar. (2) the experimental conditions, the SiC particles on the strengthening and weakening of the matrix under the action of the tensile strength first increased with the SiC content increased, when the SiC content is high, the tensile strength with the SiC content the increases. (3) the experimental conditions, the elastic modulus of composite materials with SiC content increased. References [1] Tang Pei Zhao. Composite Materials and Their Applications [M]. Chongqing: Chongqing University Press, 1998, l ~ 57 [2] Wang Rongguo, Wu Weili, the ancient skies. Introduction to Composite Materials [M]. Harbin Institute of Technology Press ,1998,124-142 [3], Ni Li, Chen Qi. Composite Materials Science and Engineering [M]. Beijing: Science Press, 2002,386 ~ 4O4 [4] DarrellR. Herlling, GlennJ. Grant. Low-COStaluminummetalmatrixcomposites [J]. ADVANCEDMATERIALS & PROCESSES. 200l, (6): 37 ~ 40 [5] XIE Shui-sheng, Huang macro. Semi-solid metal processing technology and its application [M]. Metallurgical Industry Press, 1999, l [6] Suhua Qin,[link widoczny dla zalogowanych], Ming Zhu Fang, Gao. Semi-solid casting of the current situation and prospects [J]. Special Casting & Nonferrous Alloys. 1998, (5): 1 ~ 6 [7] KimoTF. Thelarge · scalecommercializationofaluminum · matrixcomposltes [J]. JOM, 1994.46 (I1) :49-53 [8] Ming Yan, Fang Li Gao, Chen mosaic, particle reinforced aluminum matrix composite casting methods and practice of Review [J]. Light Alloy Fabrication Technology. 1998,[link widoczny dla zalogowanych],26 (4): 47 Received: 22 received in 2003 a revised version of a ll date :2003.12-10 Baosteel Group, the Fortune 500 according to the U.S. magazine \$ 14,548,000,000 Baosteel Group ranked No. 372 in sales, become competitive in the industry and manufacturing the first batch of the Fortune 500 companies. Ben Kanxun

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