Scholarlink

<p>This study investigates the mechanical and wear performance of AZ91D magnesium alloy strengthened with titanium diboride nanoparticles. Addressing the gap in research on low TiB<sub>2</sub> contents, composites with 0.5 and 1.5&#xa0;wt.% reinforcement were produced through stir casting. Optical microscopy, scanning electron microscopy and x-ray diffraction analyses confirmed refined grain structures, enhanced matrix homogeneity and uniform nanoparticle incorporation. The objective was to evaluate how small TiB<sub>2</sub> additions influence microstructural, mechanical and tribological behaviour. Results showed that introducing 1.5&#xa0;wt.% TiB<sub>2</sub> resulted in a 58% grain size reduction (139&#xa0;µm), a 110% increase in hardness (148.4 HV), a 10.5% increase in ultimate tensile strength (253.1&#xa0;MPa) and a 14% increase in yield strength (171.1&#xa0;MPa) compared to the base alloy. In wear tests at a constant sliding speed of 1&#xa0;m/s, the wear rate was reduced by 65% (4.01&#xa0;×&#xa0;10<sup>−4</sup>&#xa0;mm<sup>3</sup>/N.m at 50&#xa0;N), while the coefficient of friction dropped by 23% (from 0.3285 to 0.2538). These improvements are attributed to dispersion hardening, Orowan strengthening, grain refinement and strong interfacial bonding. In conclusion, the 1.5&#xa0;wt.% TiB<sub>2</sub> composite showed the most favourable balance of strength and wear resistance, making it suitable for lightweight applications requiring high durability.</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

Enhancing Wear Resistance and Mechanical Properties of TiB2-Reinforced AZ91D Magnesium Alloys

  • 期刊论文

  • 发表日期：

    2025年12月16日

查看全文
  • K. Athili,
  • Anil Kumar Birru,
  • Samjukta Sinha,
  • Ratna Sunil Buradagunta,
  • Praveen Kumar Bannaravuri,
  • Manojit Ghosh

摘要

This study investigates the mechanical and wear performance of AZ91D magnesium alloy strengthened with titanium diboride nanoparticles. Addressing the gap in research on low TiB2 contents, composites with 0.5 and 1.5 wt.% reinforcement were produced through stir casting. Optical microscopy, scanning electron microscopy and x-ray diffraction analyses confirmed refined grain structures, enhanced matrix homogeneity and uniform nanoparticle incorporation. The objective was to evaluate how small TiB2 additions influence microstructural, mechanical and tribological behaviour. Results showed that introducing 1.5 wt.% TiB2 resulted in a 58% grain size reduction (139 µm), a 110% increase in hardness (148.4 HV), a 10.5% increase in ultimate tensile strength (253.1 MPa) and a 14% increase in yield strength (171.1 MPa) compared to the base alloy. In wear tests at a constant sliding speed of 1 m/s, the wear rate was reduced by 65% (4.01 × 10−4 mm3/N.m at 50 N), while the coefficient of friction dropped by 23% (from 0.3285 to 0.2538). These improvements are attributed to dispersion hardening, Orowan strengthening, grain refinement and strong interfacial bonding. In conclusion, the 1.5 wt.% TiB2 composite showed the most favourable balance of strength and wear resistance, making it suitable for lightweight applications requiring high durability.