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http://dx.doi.org/10.5228/KSPP.2002.11.1.045

Reheating Process of Metal Matrix Composites Fabricated by Combined Stirring Process for Thixoforming  

이동건 (부산대학교 대학원)
강충길 (부산대학교 기계공학부)
Publication Information
Transactions of Materials Processing / v.11, no.1, 2002 , pp. 45-53 More about this Journal
Abstract
The forming process of metal matrix composites by die casting and squeeze casting process are limited in size and dimension In term of final parts. The melt strirring method have the problems that the homogeneous distribution of the reinforcements is difficult due to the low weldability and the density difference between the molten metal and the reinforcement. The thixoforming process for metal matrix composites has numerous advantages compacted to die casting, squeeze casting and compocasting. However, for the thixofoming process, the billet with the desired volume fraction must be heated to obtain a uniform temperature distribution over the entire cross-sectional areas. To obtain the reheating conditions of composites, the particulate reinforced metal matrix composites for thixoforming were fabricated by combined stirring process which is simultaneously performed with electro-magnetic stirring and mechanical stirring process. The matrix alloy and reinforcement are used to aluminum alloy(A357) and SiCp with diameter 14, $25{\mu}m$, respectively. The microstructure characteristics were investigated by changing the volume fraction and reinforcement size. The heating conditions to obtain the uniform temperature distribution in cross section area of fabricated metal matrix composites billet are proposed with heating time, the heating temperature and the holding time.
Keywords
Metal Matrix Composites; Thixoforming; Reheating;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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