交流磁場間欠印加による部分強化型Al基SiC粒子分散複合材料の作製 [in Japanese] Fabrication of aluminum-matrix composites locally reinforced with SiC particles by using intermittent A.C. magnetic field [in Japanese]
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In our previous study, aluminum matrix composites partly reinforced by SiC particles were fabricated by the imposition of a high frequency magnetic field to molten aluminum suspending SiC particles. The thickness of particle-accumulated layer (PAL) was almost the same as the skin depth that depends on the frequency of the magnetic field. In the present study, a 3 kHz magnetic field is applied to realize thicker PAL. Although a 4.71 mm PAL is expected at 3 kHz, PAL is not formed because of a strong electromagnetic flow. Intermittent imposition of magnetic field is tested to increase PAL, which seems effective to reduce the electromagnetic flow. A 4 mm PAL with dense particle packing is realized by an intermittent magnetic field composed of 1 s imposition and 1 s pausing. Numerical calculation is performed to understand the behavior of metal flow with the intermittent magnetic field. It is found that 0.5 s is required for the development of metal flow. As the relaxation time of a single SiC particle in molten aluminum is far less than 0.5 s, PAL can be formed before the metal flow develops.
- J. Japan Inst. Light Metals
J. Japan Inst. Light Metals 57(1), 12-18, 2007-01-30
The Japan Institute of Light Metals