Composite Material Processing


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Composite Material Processing



Transverse cross sections
of multi-crystal silicon;
(a) as-etched surface
(b) inverse pole figure
(c) determination of twin boundary
(d) grain boundary

Solidification process condition affects to the microstructure development and the micro-scale phase selection, and eventually governs the functional and structural properties in the metal, semiconductor and composites materials. For example, the multi-crystal silicon are directionally solidified in order to array the crystal orientation and to increase the photo-electric potential transfer efficiency. The aluminum or magnesium cast alloys are uses for the parts in transportation vehicle, because the solidification process can produce the complicated shape at low cost. Furthermore, the microstructural quality of steel is determined during directional solidification process. Therefore, research about the solidification sequence is still essential to maintain the high quality of materials or to develop the new materials. In this laboratory, the solidification mechanism are analyzed in relation with the mechanical and functional properties in the metal (aluminum alloy, magnesium alloy for gravity casting and die-casting process, steel and cast iron), the semiconductor (multi-crystal silicon for solar battery) and the composites materials (alumina, silicon carbide reinforced aluminum alloy).


Professor Hirofumi Miyahara

The Main Research Topics

  • Improvement of Photoelectric Conversion Efficiency of Multi-Crystal Silicon for Solar Cell Devices by Solidification Control
  • Control of Solidification of Aluminum Alloy for Light-Weight and High-Strength Engine
  • Improvement of Wear Resistance of Steel Cast Iron by Reforming the Crystalline Texture
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