Effects of Zn, Zr Addition on Microstructures and Hardness of Mg/SiCp Composites Fabricated by Rheo-Compocasting

Rheo-Compocasting법으로 제조한 Mg/SiCp 복합재료의 조직 및 경도 특성에 미치는 Zn, Zr 첨가의 영향

  • Published : 1995.12.20

Abstract

SiC particles reinforced Mg-Zr, Mg-Zn and Mg-Zn-Zr composites were manufactured by Rheocompocasting method. Effects of Zn, Zr addition on microstructures and hardness were investigated by using the micro Vickers hardness tester, the optical and scanning electron microscopy. By the Zr addition to the pureMg/SiCp composites, SiC particles become more homogeneously dispersed and grain refined so that the micro hardness of the composite increased. In case of Zn addition, although grain refinement and homogeneous dispersion effects of SiC particles were not obtained, hardness was more increased than the only Zr added composite by the formation of many Mg-Zn intermetallic compounds at grain boundary. In the Mg-Zn-Zr/SiCp composite, the highest value of hardness was obtained by triple effects such as grain refining, dispersion hardening of SiC particles and Mg-Zn compounds.

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