Zhang Rong, Zou Chunming, Wei Zunjie, Wang Hongwei
School of Materials Science and Engineering, Fujian University of Technology, Fuzhou 350118, China.
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China.
Materials (Basel). 2023 Jun 11;16(12):4312. doi: 10.3390/ma16124312.
The microstructure and mechanical properties of SiC/Al-40Si composites prepared under high pressure were studied. As the pressure increases from 1 atm to 3 GPa, the primary Si phase in the Al-40Si alloy is refined. With increasing pressure, the composition of the eutectic point increases, the solute diffusion coefficient decreases exponentially, and the concentration of Si solute at the front of the solid-liquid interface of the primary Si is low, which contributes to the refining of the primary Si and inhibiting its faceted growth. The bending strength of SiC/Al-40Si composite prepared under 3 GPa was 334 MPa, which was 66% higher compared to the Al-40Si alloy prepared under the same pressure.
研究了高压下制备的SiC/Al-40Si复合材料的微观结构和力学性能。随着压力从1个大气压增加到3吉帕，Al-40Si合金中的初生硅相得到细化。随着压力增加，共晶点的成分增加，溶质扩散系数呈指数下降，初生硅固液界面处的硅溶质浓度较低，这有助于初生硅的细化并抑制其平面生长。在3吉帕压力下制备的SiC/Al-40Si复合材料的抗弯强度为334兆帕，与在相同压力下制备的Al-40Si合金相比高66%。
