Preparation of High-Strength Al–Mg–Si/Al2O3 Composites with Lamellar Structures Using Freeze Casting and Pressureless Infiltration Techniques
来源期刊：Acta Metallurgica Sinica2014年第5期
论文作者：Ping Shen Juwei Xi Yujie Fu Alateng Shaga Chang Sun Qichuan Jiang
文章页码：944 - 950
摘 要：Lamellar porous alumina scaffolds with the initial solid loadings of 20, 25, and 30 vol% were prepared by freeze casting using 5 lm alumina powders. With the addition of 3 wt% Mg O–Al2O3–Si O2 nanopowders in a eutectic composition as sintering aid, the maximum compressive strength of the sintered scaffolds reached（64 ± 2） MPa after sintering at 1,773 K for 2 h. The lamellar porous scaffolds were then filled with a molten Al–12Si–10 Mg alloy（in wt%）by pressureless infiltration at 1,223 K in a N2 atmosphere, yielding the shell-like structure of the composites. The compressive strength of the upper part composite with the initial 30 vol% solid loading reached（1,190 ± 50） MPa, which was about 3.5 times as large as that of the matrix alloy.
Ping Shen，Juwei Xi，Yujie Fu，Alateng Shaga，Chang Sun，Qichuan Jiang
Key Laboratory of Automobile Materials (Ministry of Education),Department of Materials Science and Engineering,Jilin University
摘 要：Lamellar porous alumina scaffolds with the initial solid loadings of 20, 25, and 30 vol% were prepared by freeze casting using 5 lm alumina powders. With the addition of 3 wt% Mg O–Al2O3–Si O2 nanopowders in a eutectic composition as sintering aid, the maximum compressive strength of the sintered scaffolds reached（64 ± 2） MPa after sintering at 1,773 K for 2 h. The lamellar porous scaffolds were then filled with a molten Al–12Si–10 Mg alloy（in wt%）by pressureless infiltration at 1,223 K in a N2 atmosphere, yielding the shell-like structure of the composites. The compressive strength of the upper part composite with the initial 30 vol% solid loading reached（1,190 ± 50） MPa, which was about 3.5 times as large as that of the matrix alloy.
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