<p>This work employed a two-stage stir casting procedure to fabricate Al7075 composites reinforced with micronsized ZrO₂ and graphite (Gr) particles, and subsequently evaluated their mechanical and tribological properties. Al7075 alloy composites reinforced with 3 wt.% ZrO₂ and 3 wt.% graphite (Gr) particles were fabricated separately to evaluate the individual effects of each reinforcement. In addition, hybrid composites incorporating both 3 wt.% ZrO₂ and 3 wt.% Gr were also synthesised to investigate their combined influence. The impact of ZrO<sub>2</sub> and graphite incorporation into Al7075 was evaluated by conducting hardness, tensile, compression and wear tests. Scanning electron microscopy and energy dispersive spectroscopy were used to investigate the matrix alloy’s microstructure and particle dispersion. Composites made of Al7075-Gr, Al7075-ZrO<sub>2</sub>, and Al7075-Gr-ZrO<sub>2</sub> showed a significant improvement in tensile strength and wear resistance, whereas Al7075-Gr composites hardness decreased slightly. Scanning electron microscope (SEM) micrographs were used to analyse the surfaces of tensile test specimens. Wear studies were conducted utilising a tribometer to investigate the tribological characteristics of both Al7075 and graphite-ZrO<sub>2</sub> composites. The incorporation of hybrid particles markedly enhanced the wear resistance of the 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

Influence of Graphite and ZrO2 Particles Addition on the Mechanical and Wear Behaviour of Al7075 Alloy Composites

  • R. Sampath Kumar,
  • H. C. Chittappa,
  • Madeva Nagaral

摘要

This work employed a two-stage stir casting procedure to fabricate Al7075 composites reinforced with micronsized ZrO₂ and graphite (Gr) particles, and subsequently evaluated their mechanical and tribological properties. Al7075 alloy composites reinforced with 3 wt.% ZrO₂ and 3 wt.% graphite (Gr) particles were fabricated separately to evaluate the individual effects of each reinforcement. In addition, hybrid composites incorporating both 3 wt.% ZrO₂ and 3 wt.% Gr were also synthesised to investigate their combined influence. The impact of ZrO2 and graphite incorporation into Al7075 was evaluated by conducting hardness, tensile, compression and wear tests. Scanning electron microscopy and energy dispersive spectroscopy were used to investigate the matrix alloy’s microstructure and particle dispersion. Composites made of Al7075-Gr, Al7075-ZrO2, and Al7075-Gr-ZrO2 showed a significant improvement in tensile strength and wear resistance, whereas Al7075-Gr composites hardness decreased slightly. Scanning electron microscope (SEM) micrographs were used to analyse the surfaces of tensile test specimens. Wear studies were conducted utilising a tribometer to investigate the tribological characteristics of both Al7075 and graphite-ZrO2 composites. The incorporation of hybrid particles markedly enhanced the wear resistance of the composites.