Scholarlink

<p>The effects of milling time and sintering temperature on the microstructure and properties of Al-10 vol.%Al<sub>2</sub>O<sub>3</sub> composites with and without adding 5 wt.%Zr were investigated. Composite granules milled for 30&#xa0;h were hot pressed at temperatures of 400°C and 500°C followed by annealing for 1&#xa0;h. With increasing milling time, the microhardness of Al-10%Al<sub>2</sub>O<sub>3</sub>-5%Zr and Al-10%Al<sub>2</sub>O<sub>3</sub> composite granules increased smoothly to ~ 230 HV and ~ 180 HV, respectively. Increasing the subsequent sintering temperature from 400°C to 500°C resulted in a decrease in porosity for both materials but also a decrease in strength properties with an increase in crystallite size. For the Zr-containing composite, the Al<sub>3</sub>Zr-L1<sub>2</sub> phase was precipitated at 400&#xa0;°C, and the tetragonal D0<sub>23</sub> phase was precipitated at 500°C. Due to the strengthening effect of Al<sub>3</sub>Zr precipitates and oxide particles, the Al-10%Al<sub>2</sub>O<sub>3</sub>-5%Zr composite sintered at both temperatures exhibited a high compressive yield strength (290 and 230&#xa0;MPa for 400°C and 500°C, respectively) at a test temperature of 300°C.</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 Zirconium and Processing Modes on Microstructure and Properties of Mechanically Alloyed Al-10%Al2O3 Composite

  • 期刊论文

  • 发表日期：

    2025年1月27日

查看全文
  • A. S. Prosviryakov,
  • D. A. Bekarevich,
  • V. V. Cheverikin,
  • V. V. Palacheva,
  • A. V. Mikhaylovskaya

摘要

The effects of milling time and sintering temperature on the microstructure and properties of Al-10 vol.%Al2O3 composites with and without adding 5 wt.%Zr were investigated. Composite granules milled for 30 h were hot pressed at temperatures of 400°C and 500°C followed by annealing for 1 h. With increasing milling time, the microhardness of Al-10%Al2O3-5%Zr and Al-10%Al2O3 composite granules increased smoothly to ~ 230 HV and ~ 180 HV, respectively. Increasing the subsequent sintering temperature from 400°C to 500°C resulted in a decrease in porosity for both materials but also a decrease in strength properties with an increase in crystallite size. For the Zr-containing composite, the Al3Zr-L12 phase was precipitated at 400 °C, and the tetragonal D023 phase was precipitated at 500°C. Due to the strengthening effect of Al3Zr precipitates and oxide particles, the Al-10%Al2O3-5%Zr composite sintered at both temperatures exhibited a high compressive yield strength (290 and 230 MPa for 400°C and 500°C, respectively) at a test temperature of 300°C.