Scholarlink

<p>This study presents a detailed evaluation of the mechanical and tribological behaviour of aluminium-based metal matrix composites (AMCs) reinforced with silicon carbide (SiC) and molybdenum disulfide (MoS<sub>2</sub>). SiC and MoS<sub>2</sub> reinforced hybrid AMCs containing SiC (6–26 wt.%) and MoS<sub>2</sub> (1.5–9.5 wt.%) with 1 wt.% magnesium (Mg) were fabricated through a two-step stir casting process, followed by laser surface texturing and graphite infiltration to enhance self-lubricating performance. The primary objective of this research is to elucidate the correlation between reinforcement composition, microstructural evolution, and resultant mechanical, wear and abrasion properties. The results demonstrate a substantial enhancement in hardness and tensile strength with SiC reinforcement, reaching 118 HV and 196&#xa0;MPa, respectively, at 21 wt.% of SiC AMC, compared with 62 HV and 122&#xa0;MPa for the unreinforced alloy. MoS<sub>2</sub> addition (up to 5.5 wt.%) effectively reduced the coefficient of friction from 0.68 to 0.38 and decreased the wear rate by approximately 41%, indicating improved self-lubrication. Pin-on-disc and dry sand abrasion tests confirmed that SiC-reinforced AMCs exhibit superior wear resistance under high-load conditions, whereas MoS<sub>2</sub>-reinforced counterparts perform more efficiently under moderate loads. Microstructural analysis using scanning electron microscopy (SEM) revealed that abrasive wear was the dominant mechanism in SiC-reinforced AMCs, whereas adhesive wear was the primary mechanism in MoS<sub>2</sub>-reinforced AMCs. The synergistic effect of laser surface texturing and graphite infiltration further enhanced lubricant retention and tribological stability. The findings establish a quantitative framework for designing high-performance hybrid AMCs with tailored mechanical strength and self-lubricating capabilities, suitable for aerospace, automotive, and structural engineering applications.</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

SiC and MoS2-Reinforced Al–1 wt.% Mg Hybrid Metal Matrix Composites: Effect of Laser Surface Texturing and Graphite Infiltration on Mechanical and Tribological Performance

  • 期刊论文

  • 发表日期：

    2026年1月27日

查看全文
  • Ambuj Pathak,
  • Anuz Zindal,
  • Sakshi Chauhan,
  • Vinay Kumar Singh

摘要

This study presents a detailed evaluation of the mechanical and tribological behaviour of aluminium-based metal matrix composites (AMCs) reinforced with silicon carbide (SiC) and molybdenum disulfide (MoS2). SiC and MoS2 reinforced hybrid AMCs containing SiC (6–26 wt.%) and MoS2 (1.5–9.5 wt.%) with 1 wt.% magnesium (Mg) were fabricated through a two-step stir casting process, followed by laser surface texturing and graphite infiltration to enhance self-lubricating performance. The primary objective of this research is to elucidate the correlation between reinforcement composition, microstructural evolution, and resultant mechanical, wear and abrasion properties. The results demonstrate a substantial enhancement in hardness and tensile strength with SiC reinforcement, reaching 118 HV and 196 MPa, respectively, at 21 wt.% of SiC AMC, compared with 62 HV and 122 MPa for the unreinforced alloy. MoS2 addition (up to 5.5 wt.%) effectively reduced the coefficient of friction from 0.68 to 0.38 and decreased the wear rate by approximately 41%, indicating improved self-lubrication. Pin-on-disc and dry sand abrasion tests confirmed that SiC-reinforced AMCs exhibit superior wear resistance under high-load conditions, whereas MoS2-reinforced counterparts perform more efficiently under moderate loads. Microstructural analysis using scanning electron microscopy (SEM) revealed that abrasive wear was the dominant mechanism in SiC-reinforced AMCs, whereas adhesive wear was the primary mechanism in MoS2-reinforced AMCs. The synergistic effect of laser surface texturing and graphite infiltration further enhanced lubricant retention and tribological stability. The findings establish a quantitative framework for designing high-performance hybrid AMCs with tailored mechanical strength and self-lubricating capabilities, suitable for aerospace, automotive, and structural engineering applications.