Scholarlink

<p>In the present investigation, in situ polymer-derived ceramic (PDC)-reinforced A356 aluminum composites were produced using two semisolid processing routes—cooling slope casting at 650 °C (CS-650) and mechanical stirring at 650 °C (MS-650). Polymethylhydrosiloxane (PMHS), cross-linked into silicon oxycarbide (SiOC) ceramic particles, was applied as the reinforcement. The structural conversion of PMHS to SiOC was validated using Fourier transform infrared (FTIR) spectroscopy, while scanning electron microscopy (SEM) indicated irregular-shaped, micron-sized particles conducive to melt blending. Comparative microstructural and mechanical examination revealed that the CS-650 process yielded a finer, non-dendritic α-Al microstructure, improved dispersion of SiOC particles, and significantly lower porosity (~0.78%) than MS-650 (~1.2%). The CS-650 composites showed enhanced mechanical properties, with an ultimate tensile strength (UTS) of ~170 MPa, yield strength (YS) of ~92 MPa, and elongation of ~6.7%, due to improved particle–matrix bonding and effective gas escape during solidification. These results highlight the potential of integrating PDC-based in situ reinforcement with cooling slope semisolid casting to overcome porosity and agglomeration challenges in aluminum metal matrix composites.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Enhanced Microstructure and Mechanical Properties of In Situ Polymer-Derived Ceramic-Reinforced A356 Aluminum Composites Through Cooling Slope Casting

  • 期刊论文

  • 发表日期：

    2025年10月1日

查看全文
  • Arulpandian Palanisamy,
  • Krishnaveni Anbalagan,
  • Raja Palanivel,
  • J. R. Vinod Kumaar

摘要

In the present investigation, in situ polymer-derived ceramic (PDC)-reinforced A356 aluminum composites were produced using two semisolid processing routes—cooling slope casting at 650 °C (CS-650) and mechanical stirring at 650 °C (MS-650). Polymethylhydrosiloxane (PMHS), cross-linked into silicon oxycarbide (SiOC) ceramic particles, was applied as the reinforcement. The structural conversion of PMHS to SiOC was validated using Fourier transform infrared (FTIR) spectroscopy, while scanning electron microscopy (SEM) indicated irregular-shaped, micron-sized particles conducive to melt blending. Comparative microstructural and mechanical examination revealed that the CS-650 process yielded a finer, non-dendritic α-Al microstructure, improved dispersion of SiOC particles, and significantly lower porosity (~0.78%) than MS-650 (~1.2%). The CS-650 composites showed enhanced mechanical properties, with an ultimate tensile strength (UTS) of ~170 MPa, yield strength (YS) of ~92 MPa, and elongation of ~6.7%, due to improved particle–matrix bonding and effective gas escape during solidification. These results highlight the potential of integrating PDC-based in situ reinforcement with cooling slope semisolid casting to overcome porosity and agglomeration challenges in aluminum metal matrix composites.