Effects of SiC Particle and Holding Time on Semi-Solid Microstructure of SiCP/AZ61 Composites

Abstract:

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Effects of SiC particle and holding time on microstructure evolution of SiCP/AZ61 composites during semi-solid isothermal heat treatment method were studied, and evolution mechanism of semi-solid microstructure of composites was discussed. The results indicated that the process of microstructure evolution of SiCP/AZ61 composites by the isothermal holding at the temperatures of 595°C for different times (0min~90min) experienced in succession the rapid merging of the secondary dendritic arms →large massive structure→melting and separating of the local grain boundary →spheroidization of the gains →slowing growth of globular microstructure. Synthetically, after isothermal holding at 595°C for 30min to 60min the favorable semi-solid microstructure can be obtained; Compared with the monolithic AZ61alloy, microstructure of SiCP/AZ61 composites during semi-solid isothermal heat-treatment was finer as a result of entering of Sic particle, and with the increasing of SiC particle volume fraction, globular gain size was smaller.

Info:

Periodical:

Advanced Materials Research (Volumes 152-153)

Edited by:

Zhengyi Jiang, Jingtao Han and Xianghua Liu

Pages:

628-633

DOI:

10.4028/www.scientific.net/AMR.152-153.628

Citation:

F. Y. Zhang et al., "Effects of SiC Particle and Holding Time on Semi-Solid Microstructure of SiCP/AZ61 Composites", Advanced Materials Research, Vols. 152-153, pp. 628-633, 2011

Online since:

October 2010

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Price:

$35.00

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