Mechanism of macro-segregation formation in SiC whisker reinforced aluminum alloys composites fabricated by squeeze casting

被引:4
作者
Hong, SK
Tezuka, H
Kamio, A
Chun, BS
Cho, SS
机构
[1] TOKYO INST TECHNOL, DEPT MET ENGN, MEGURO KU, TOKYO 152, JAPAN
[2] CHUNGNAM NATL UNIV, RASOM ERC, TAEJON 305764, SOUTH KOREA
关键词
squeeze casting; macro-segregation; SiCwhisker/aluminum alloy composites; aluminum-magnesim alloy; aluminum-lithium alloy; interface reaction; Al2O3; MgAl2O4; Mg2Si; LiAlSi;
D O I
10.2320/jinstmet1952.60.2_218
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
Mechanism of macro-segregation formation in SiC whisker/pureAl, Al-Mg and Al-Li alloys composites formed during squeeze casting was investigated by using micro-Vickers hardness, X-ray diffraction, EPMA, SEM and TEM observations. The macro-segregated area is formed along the infiltration routes of molten metal from side walls and top surface of the SiCw preform at the center-low zone in the SiCw/aluminum alloys composites. It is the main reason for the formation of macro-segregation that the melt reduced active solute element (Mg or Li) due to the interface reaction between SiO2 contained in the preform and the matrix alloys squeezes toward the center-low zone which solidifies finally in the composite and solidifies as it is. The following compounds were detected as interface reaction products; Al2O3 in the SiCw/pureAl, spinel type of MgAl2O4 and Mg2Si in the SiCw/Al-Mg, and LiAlSi, lithium oxides in the SiCw/Al-Li alloy composites. Finally the sound composites without the macro-segregation can he obtained by using the specially designed fabrication method for this study.
引用
收藏
页码:218 / 224
页数:7
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