Effects of Matrix Components on Microstructure and Properties of SiC_P/Al-Fe-V-Si Composites

• Main Authors: HE Yi-qiang, XU Hu-lin, QIAN Chen-chen, DING Yun-fei, FENG Wen, CHEN Jing-song, LI Hua-qiang, FENG Li-chao
• Format: Article
• Language: zho
• Published: Journal of Materials Engineering 2018-12-01
• Series: Journal of Materials Engineering
• Subjects: Al-matrix composite; spray deposition; matrix component; particle reinforcement; microstructure
• Online Access: http://jme.biam.ac.cn/CN/Y2018/V46/I12/124
• ISSN: 1001-4381; 1001-4381

Spray deposited SiC_P/Al-Fe-V-Si composites were densified by twice hot pressing and subsequently multi-pass hot rolling. Scanning electron microscope, transmission electron microscope and tensile test were used, and the effect of matrix alloy components and Fe/V ratio on microstructure, mechanical properties and heat resistance of the composites were analyzed.The results show that the as-rolled composites have high volume fraction Al₁₂(Fe,V)₃Si dispersoids, and volume fraction of the dispersoids increases with Fe content increasing. Volume fraction of Al₁₂(Fe,V)₃Si dispersoids is up to 40% when Fe content of the matrix alloy is 11.5%(mass fraction). Al₁₂(Fe,V)₃Si dispersoids with the diameter of 50-80nm are distributed along the grain boundaries, and exhibit excellent thermal stability up to 500℃. However, above 500℃ the Fe atoms diffuse in the form of bulk diffusion, and accordingly the dispersoids both along the grain boundaries and in the grains become coarsened at a relative high velocity. Coarsening velocity of Al₁₂(Fe,V)₃Si dispersoids falls with the increase of Fe/V ratio. Strength of the composite increases with volume fraction of Al₁₂(Fe,V)₃Si dispersoid increasing, and decreases with the tensile temperature rising; the elongation of the composite decreases both with rise of volume fraction of Al₁₂(Fe,V)₃Si dispersoid and tensile temperature.