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<p>To investigate the key factors that cause ZrB<sub>2</sub>/AA6111 and (ZrB<sub>2</sub>+Al<sub>3</sub>Zr)/AA6111 aluminum matrix composites (AMCs) made via in situ reaction to behave differently in terms of friction and wear. Room-temperature dry sliding tribological behavior of AA6111 Al alloys, ZrB<sub>2</sub>/AA6111, and (ZrB<sub>2</sub>+Al<sub>3</sub>Zr)/AA6111 AMCs against silicon nitride (Si<sub>3</sub>N<sub>4</sub>) counterparts were investigated. The study showed that AA6111/Al alloy had the highest wear rate and the most unstable coefficient of friction (COF), indicating the worst abrasion resistance. (ZrB<sub>2</sub>+Al<sub>3</sub>Zr)/AA6111 AMCs exhibit a lower wear rate and higher COF than ZrB<sub>2</sub>/AA6111 AMCs. The result proved that the Al<sub>3</sub>Zr particles prepared by the in-situ reaction are strongly bonded (lattice misfit <i>δ</i>=2.7%) to the Al matrix and are not easily stripped from the substrate. ZrB<sub>2</sub>/AA6111 AMCs exhibited a lower COF attributed to the tribochemical reaction inducing the formation of more boric acid (H<sub>3</sub>BO<sub>3</sub>) films with a graphite-like structure having a lubricating effect.</p>

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In-situ Particulate-Reinforced Al Matrix Composites: Effect of the Synergistic Mechanism of ZrB2 and Al3Zr on Tribological Behavior

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年5月30日

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  • Feng Wang,
  • Hui Li,
  • Xiaolong Zhang,
  • Lei Jiao,
  • Wei He,
  • Xudong Han,
  • Shcheretskyi Volodymyr

摘要

To investigate the key factors that cause ZrB2/AA6111 and (ZrB2+Al3Zr)/AA6111 aluminum matrix composites (AMCs) made via in situ reaction to behave differently in terms of friction and wear. Room-temperature dry sliding tribological behavior of AA6111 Al alloys, ZrB2/AA6111, and (ZrB2+Al3Zr)/AA6111 AMCs against silicon nitride (Si3N4) counterparts were investigated. The study showed that AA6111/Al alloy had the highest wear rate and the most unstable coefficient of friction (COF), indicating the worst abrasion resistance. (ZrB2+Al3Zr)/AA6111 AMCs exhibit a lower wear rate and higher COF than ZrB2/AA6111 AMCs. The result proved that the Al3Zr particles prepared by the in-situ reaction are strongly bonded (lattice misfit δ=2.7%) to the Al matrix and are not easily stripped from the substrate. ZrB2/AA6111 AMCs exhibited a lower COF attributed to the tribochemical reaction inducing the formation of more boric acid (H3BO3) films with a graphite-like structure having a lubricating effect.