Lamellar-interpenetrated Al-Si-Mg/SiC composites fabricated by freeze casting and pressureless infiltration

作者：Shaga, Alateng; Shen, Ping^*; Sun, Chang; Jiang, Qichuan

来源：Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 2015, 630: 78-84.

DOI：10.1016/j.msea.2015.02.012

• Mechanical characterization
• Composites
• Sintering

Porous laminated SiC scaffolds with initial solid loadings of 20-40 vol% were prepared by freeze casting and then sintered at 1200 degrees C for 2 h in air to produce a SiO2 layer. Subsequently, the preforms were pressureless-infiltrated by an Al-12 wt% Si-10 wt% Mg alloy in a N-2 atmosphere, forming a lamellar-interpenetrated structure in the composites. The resultant composites were investigated by compression tests and ultrasonic pulse echo measurements in the longitudinal and transverse directions, exhibiting weak orthotropic properties. The highest compressive strength (722 +/- 35 MPa) was achieved in the samples with 30 vol% SiC in a longitudinal direction and the largest elastic modulus (163 GPa) was exhibited in the 40 vol% SiC composites.

• 出版日期2015-4-10
• 单位吉林大学