Scholarlink

<p>This work reports wear performance and mechanical properties of Ti-6Al-4&#xa0;V alloy manufactured using powder metallurgy techniques, mainly, high energy ball milling and pressure assisted sintering. Alloyed powder was ball milled for several durations τ<sub>m</sub> = 0, 2&#xa0;h, 6&#xa0;h, 12&#xa0;h and 18&#xa0;h in order to examine the structural alterations concerning the morphology, size, and nature of powder particles. SEM and laser diffraction results have shown refined powder particles with shape ranges between irregular oblate and prolate spheroids to flaky thin platelets with agglomerations for high milling durations, in the same line, XRD data revealed phase transformation from α-HCP to β-BCC phase accompanied with the formation of amorphous phase. The milled powders were hot pressed under vacuum; consolidated samples were obtained. Increased hardness &lt; HV<sub>0.2</sub> &gt; and Young’s values (E), &lt; GPa &gt; were detected reaching 622HV<sub>0.2</sub> and 268 GPa, respectively, for 18&#xa0;h of milling. Continuously, metallographic observations have revealed the appearance of low angle grain boundaries. specific wear rate &lt; W<sub>S</sub> &gt; , (mm<sup>3</sup> Nm<sup>−1</sup>) and wear volume W<sub>V</sub>, (µm<sup>3</sup>) were evaluated using ball on disc tribometer with a 10 N load. The results show decreasing values of wear rate and volume, yet, taking into consideration SEM and 3D profilometer images, a tribolayer has formed on the 18&#xa0;h sample limiting its matter loss. Correspondingly, distinctive wear mechanisms were noticed; abrasive wear and delamination for τ<sub>m</sub> = 0 and short milling duration τ<sub>m</sub> = 2, 6&#xa0;h, abrasive wear and moderate ploughing for higher τ<sub>m</sub>, while, for τ<sub>m</sub> = 18&#xa0;h adhesive third body wear was observed.</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

High-energy ball milling and pressure-assisted sintering of Ti-6Al-4 V alloy: a powder design approach for controlled microstructure, enhanced mechanical properties, and improved wear resistance

  • 期刊论文

  • 发表日期：

    2025年11月3日

查看全文
  • Chaima Boukhalfa,
  • Mamoun Fellah,
  • Mostefa Baccouche,
  • Ridvan Yamanoğlu,
  • İdris Gökalp,
  • Ahmed-Ameur Zegai,
  • Abdallah Gani

摘要

This work reports wear performance and mechanical properties of Ti-6Al-4 V alloy manufactured using powder metallurgy techniques, mainly, high energy ball milling and pressure assisted sintering. Alloyed powder was ball milled for several durations τm = 0, 2 h, 6 h, 12 h and 18 h in order to examine the structural alterations concerning the morphology, size, and nature of powder particles. SEM and laser diffraction results have shown refined powder particles with shape ranges between irregular oblate and prolate spheroids to flaky thin platelets with agglomerations for high milling durations, in the same line, XRD data revealed phase transformation from α-HCP to β-BCC phase accompanied with the formation of amorphous phase. The milled powders were hot pressed under vacuum; consolidated samples were obtained. Increased hardness < HV0.2 > and Young’s values (E), < GPa > were detected reaching 622HV0.2 and 268 GPa, respectively, for 18 h of milling. Continuously, metallographic observations have revealed the appearance of low angle grain boundaries. specific wear rate < WS > , (mm3 Nm−1) and wear volume WV, (µm3) were evaluated using ball on disc tribometer with a 10 N load. The results show decreasing values of wear rate and volume, yet, taking into consideration SEM and 3D profilometer images, a tribolayer has formed on the 18 h sample limiting its matter loss. Correspondingly, distinctive wear mechanisms were noticed; abrasive wear and delamination for τm = 0 and short milling duration τm = 2, 6 h, abrasive wear and moderate ploughing for higher τm, while, for τm = 18 h adhesive third body wear was observed.