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<p>In this study, AA5083 matrix composites containing different volume fractions of SiC were fabricated by friction stir processing (FSP). The microstructure, tensile properties as well as wear resistance of composites were examined and analyzed. Raman spectrums demonstrated that no chemical reaction was occurred between SiC and Al matrix, which was attributed to the low processing temperature during FSP. Among these composites, SiC distribution and SiC/AA5083 interfacial characteristics were different from each other. In the 9.7 vol.% SiC/AA5083 composite, SiC were uniformly distributed and well bonded with Al matrix. However, apparent SiC agglomerations and poor bonding conditions that micro-sized cracks existed at interfaces were found in the 6.5 vol.% and 12.2 vol.% SiC/AA5083 composites, which were detrimental to the properties. As a result, the yield strengths of SiC/AA5083 composites were firstly increased and then decreased with the volume fraction of SiC. Meanwhile, the wear resistances of composites were enhanced and the wear volume loss was significantly reduced. Analysis on the worn surfaces indicated that adhesive wear was occurred in FSPed matrix, while abrasive wear was occurred in the composites due to the addition of high-hardness SiC. Finally, the highest yield strength and wear resistance were obtained in the 9.7 vol.% SiC/AA5083 composite.</p>

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SiC-Induced Microstructural Characteristics in Friction Stir Processed Al Matrix Composites and Their Effects on the Strength and Wear Resistance

  • 期刊论文

  • 发表日期：

    2025年1月16日

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  • Shuai Zhang,
  • Tao Wang,
  • Ying Nie

摘要

In this study, AA5083 matrix composites containing different volume fractions of SiC were fabricated by friction stir processing (FSP). The microstructure, tensile properties as well as wear resistance of composites were examined and analyzed. Raman spectrums demonstrated that no chemical reaction was occurred between SiC and Al matrix, which was attributed to the low processing temperature during FSP. Among these composites, SiC distribution and SiC/AA5083 interfacial characteristics were different from each other. In the 9.7 vol.% SiC/AA5083 composite, SiC were uniformly distributed and well bonded with Al matrix. However, apparent SiC agglomerations and poor bonding conditions that micro-sized cracks existed at interfaces were found in the 6.5 vol.% and 12.2 vol.% SiC/AA5083 composites, which were detrimental to the properties. As a result, the yield strengths of SiC/AA5083 composites were firstly increased and then decreased with the volume fraction of SiC. Meanwhile, the wear resistances of composites were enhanced and the wear volume loss was significantly reduced. Analysis on the worn surfaces indicated that adhesive wear was occurred in FSPed matrix, while abrasive wear was occurred in the composites due to the addition of high-hardness SiC. Finally, the highest yield strength and wear resistance were obtained in the 9.7 vol.% SiC/AA5083 composite.